The authors addressed important limitations in the Cochrane HPV vaccine review and stated that the Cochrane HPV vaccine review authors should make every effort to identify all trials and the trials' limitations in their conclusion. We (members of Medwatcher Japan [YAKUGAI Ombusperson], an NGO that was launched in 1997 to monitor and prevent drug-induced disasters) strongly support their conclusions.
Medwatcher Japan released an open letter (original Japanese document) ‘Critical Opinion on Cochrane Review of HPV Vaccines’ dated on June 8th, 2018 and raised some comments concerning the content of the Cochrane HPV vaccine review and the governance of the Cochrane organisation. We have submitted the open letter (English translation of the original Japanese document) to some relevant parties in charge of Cochrane on August 13th, 2018. Furthermore, we have submitted the short version which was limited to the specifics of the contents of the Cochrane HPV vaccine review via the feedback system on The Cochrane Library on August 31st, 2018. It has been confirmed that the short version was published via the Cochrane Library feedback system. We have not, however, received any responses directly from the Cochrane.
Therefore, in addition to the points raised in this article by Jørgensen et al., we would like to address the following key comments concerning the content of the Cochrane review in this response:
1. Since the effectiveness claimed in the Cochrane revi...
The authors addressed important limitations in the Cochrane HPV vaccine review and stated that the Cochrane HPV vaccine review authors should make every effort to identify all trials and the trials' limitations in their conclusion. We (members of Medwatcher Japan [YAKUGAI Ombusperson], an NGO that was launched in 1997 to monitor and prevent drug-induced disasters) strongly support their conclusions.
Medwatcher Japan released an open letter (original Japanese document) ‘Critical Opinion on Cochrane Review of HPV Vaccines’ dated on June 8th, 2018 and raised some comments concerning the content of the Cochrane HPV vaccine review and the governance of the Cochrane organisation. We have submitted the open letter (English translation of the original Japanese document) to some relevant parties in charge of Cochrane on August 13th, 2018. Furthermore, we have submitted the short version which was limited to the specifics of the contents of the Cochrane HPV vaccine review via the feedback system on The Cochrane Library on August 31st, 2018. It has been confirmed that the short version was published via the Cochrane Library feedback system. We have not, however, received any responses directly from the Cochrane.
Therefore, in addition to the points raised in this article by Jørgensen et al., we would like to address the following key comments concerning the content of the Cochrane review in this response:
1. Since the effectiveness claimed in the Cochrane review does not coincide with the target age groups of school-based HPV vaccination programs, the Cochrane review’s authors should point out that effectiveness in the main age group for HPV vaccination has not been verified.
2. Since there is an available data for females of the study V501-018, the only study which used a saline placebo as the control, the Cochrane review’s authors should try to collect the female data of the study V501-018 and include it in the review.
3. The Cochrane review’s authors did not make mention of the characteristics of occurrence of post-HPV vaccination clinical symptoms such as multi-layered occurrence of various symptoms in the long-term after vaccination in individual adolescent girls. We suggest that the discussion on the characteristics of the multi-layered occurrence of various symptoms in the long-term after HPV vaccination should be considered.
4. Despite Japanese researchers have published many papers providing evidence of the harms of HPV vaccines, those studies were not cited by the Cochrane review’s authors. Results of those studies should be cited and discussed in relation to the review findings in the Discussion section.
5. Three of the four authors of the Cochrane review (M. Arbyn, C. Simoens and PPL. Martin-Hirsch) had received travel grants from HPV vaccine manufacturers. In light of the Cochrane conflict of interest guidelines’ criteria, we believe that a COI might exist in the Cochrane review authors.
The full contents of our open letter (English translation of the original Japanese document), including an appendix table are as given below:
(PDF available from: http://www.yakugai.gr.jp/en/topics/topic.php?id=964)
‘Critical Opinion on Cochrane Review of HPV Vaccines’
Toshihiro Suzuki, Managing Director
YAKUGAI Ombudsperson "Medwatcher Japan"
1-14-4 AM building, Shinjuku, Shinjuku-ku, Tokyo, 160-0022, Japan
URL: http://www.yakugai.gr.jp/en/
1 Introduction
In May 2018, Cochrane published the findings of a systematic review of 26 randomised controlled trials to determine the efficacy and harms of human papillomavirus (HPV) vaccines [1]. The aim of a systematic review is to provide highly reliable evidence on efficacy and harms by exhaustively collecting randomised controlled trials on the efficacy of a particular medical intervention, providing a critical appraisal of each trial’s methodology, and applying appropriate statistical methodology to synthesise the results of these trials. The Cochrane HPV vaccine review, however, falls far short of an ideal systematic review and contains numerous problems that cannot be ignored. These problems are discussed below.
2 Review of Efficacy
The HPV vaccine review claims to have confirmed a reduction in the risk of developing precancerous cervical lesions (even though the longest follow-up period was 8 years) based on an evaluation of efficacy in 26 randomised controlled trials, 25 of which were industry-funded. The risk of developing precancerous cervical lesions is a surrogate endpoint, but what the review did not confirm was a reduction in cervical cancer itself as a true endpoint of efficacy. Thus, the review does not add anything new to previous claims of efficacy by the pharmaceutical industry.
The age range for HPV vaccination in Japanese clinical practice is primarily 12 to 16 years, whereas the HPV vaccine review evaluated efficacy in females aged 15 and older, and the review authors claim in their conclusion that a prophylactic effect against precancerous lesions was confirmed in females aged 15 to 26. It should therefore be noted that the efficacy claimed in the review does not coincide with the current vaccination age group in Japan. In their discussion, the authors suggest that HPV vaccines may also be effective in girls younger than 15, noting that this age group is assumed to resemble the population of HPV-negative females 15 and older in terms of efficacy, further citing research in which girls 15 and younger showed a similar immune response to females aged 15 to 26 years. However, the review evaluated efficacy only in the population aged 15 years and above and failed to point out that efficacy has not been verified in the primary age group for clinical practice in Japan.
3 Review of Harms
The HPV vaccine review investigated harms based on the number of adverse event reports in 23 of the 26 clinical trials evaluated. It found that the HPV vaccination group had no increased risk of serious adverse events compared to the control groups, and no significant increase in deaths. However, the analysis of harms in this review contained the following problems.
(1) Adjuvanted placebos or other vaccines were used as controls
Of the 23 evaluated trials, one used an unadjuvanted hepatitis A vaccine as the control and the remaining 22 trials used an adjuvanted placebo or other adjuvanted vaccine as the control (See appendix table). Considering that there appear to be risks not only from HPV-derived ingredients (L1 protein) [2] but also from powerful adjuvants, the safety of HPV vaccines should be verified by comparison between an HPV vaccine formulation (designed to maintain a high antibody titer over a long period by adding a powerful adjuvant to L1 protein) and an unadjuvanted placebo.
In fact, study V501-018 was the only study to use a saline placebo control for the quadrivalent vaccine Gardasil. However, this trial was excluded from the HPV vaccine review’s evaluation. The review authors justified this exclusion on the grounds that although the trial included both sexes, the paper presenting the trial results did not separate male and female data, and upon inquiry the authors were told that separate data was not available for females. However, considering that study V501-018 was funded and sponsored by Merck and targeted both sexes, it is difficult to imagine that separate data was not maintained for males and females. In fact, an FDA clinical review [3] presents data on adverse reactions in 320 females vaccinated with saline placebo in study V501-018. Although the FDA review only gives data on vaccination site pain, swelling and redness, the incidence of these reactions is two to three times greater in the Gardasil group than in the saline control group, suggesting that adjuvanted HPV vaccine formulations could induce a strong immune response. This exclusion, for inexplicable reasons, of a key trial from the HPV vaccine review’s evaluation of efficacy and safety, casts doubt on the reliability of the review.
(2) Post-HPV vaccination symptoms cannot be ascertained from adverse event information in the clinical trials
The characteristics of post-HPV vaccination clinical symptoms are gradually being revealed in numerous physician-reported adverse events, showing both the complexity of these symptoms and their clinical course. There are reports of a wide range of symptoms developing in a multi-layered manner over long periods spanning several months to several years (period of maintenance of high HPV antibody titer), as well as known autoimmune diseases such as complex regional pain syndrome (CRPS), chronic fatigue syndrome (CFS) and postural orthostatic tachycardia syndrome (POTS) or similar symptoms, and even symptoms such as higher cognitive impairment.
In contrast, adverse events collected in clinical trials are reported according to predetermined reporting criteria that presuppose the occurrence of known diseases and individual symptoms. Such a reporting system cannot capture post-HPV vaccination symptoms that follow a complex course characterized by multi-layered emergence of various symptoms over a long period, and it therefore follows that the true harms of HPV vaccines cannot be detected by simply comparing the incidence of individual adverse events reported in trials.
The HPV vaccine review analysed serious adverse events through a meta-analysis based on the number of reports of individual symptoms collected during each trial’s follow-up period of several months to several years. The analysis found no difference in the incidence of adverse events between the HPV vaccine and control groups, and the review seems to conclude from this result that a certain level of safety has been demonstrated. However, as already discussed, this result is only based on the number of reports of known diseases and individual symptoms, and does not capture the multi-layered occurrence of various symptoms in the long-term after HPV vaccination in individual adolescent girls. This is a point that demands further attention.
In an analysis of adverse event reports using Vigibase, Chandler and colleagues at the WHO Uppsala Monitoring Center noted that when symptoms such as headache, dizziness and syncope, or headache, dizziness and fatigue were analyzed as symptom clusters, the result was a significantly higher proportion of adverse event reports associated with HPV vaccines than with other vaccines, and the authors point out the limitations in the conventional analytical method of only extracting individual adverse events [4, 5].
(3) Much of the literature showing evidence of harms is excluded from the Discussion
As discussed above, there are some basic limitations in the evaluation of harms associated with HPV vaccines in the systematic review of 23 trials. In addition to the paper by Chandler et al, Japanese researchers alone have published many papers providing evidence of the harms of HPV vaccines. These include case reports [6, 7, 8, 9, 10, 11] by physicians who have observed in their own patients the characteristic adverse reactions described above, papers describing objective test findings of changes in the cerebrospinal fluid, brain and nervous system that can explain patients’ symptoms [12, 13, 14, 15], an animal experiment [16], and a paper reporting a temporal relationship between HPV vaccination and onset of HPV vaccine-related symptoms in vaccinated patients [17]. At the very least, the results of these studies should have been discussed in relation to the review findings in the Discussion section, but these articles were entirely ignored and excluded from the Discussion.
(4) Critical discussion of epidemiology studies or reviews by international organisations and regulatory authorities is absent
The only results considered in the Discussion section are those that deny any evidence of harm due to HPV vaccines, such as certain epidemiology studies and reviews by the CDC, EMA and other national regulatory authorities, the WHO Global Advisory Committee on Vaccine Safety (GACVS) and other international organisations. Moreover, these conclusions are accepted without any critical scrutiny.
However, the cited epidemiology studies were designed to target predefined known conditions and specific autoimmune diseases, and did not capture the characteristic post-HPV vaccination adverse reactions described above. Furthermore, even if patients with adverse reactions to an HPV vaccine were examined by a medical facility after developing a condition or autoimmune disease defined in the research, these are fundamentally difficult diseases to diagnose, and it is easy to imagine patients being given an inaccurate diagnosis. In fact, the paper by Chandler et al reports that despite POTS, CRPS and CFS being included in 20–58% of reported adverse reactions to HPV vaccines, the disease diagnosis only included these terms in 15% of 694 cases analysed using symptom cluster analysis. The opinions of the EMA and other national regulatory authorities and the statement from GACVS also rely on this kind of limited epidemiological research as their main evidence [18, 19].
Notable bias was also apparent on the part of GACVS. Vaccine makers were in constant attendance as external experts at the regular meetings of GACVS, and a Freedom of Information request brought to light improper interference by the GACVS chairperson at a meeting of the Japanese Ministry of Health, Labour and Welfare in 2014 in order to quash concerns over HPV vaccines [20]. It is therefore inadvisable to unquestioningly accept these opinions.
4 Lessons from Review of Oseltamivir (Tamiflu)
The conclusions of a Cochrane review published in 2000 claiming the efficacy and safety of zanamivir (Relenza) and oseltamivir (Tamiflu) for the prevention and treatment of influenza [21] were revised in 2009 to acknowledge that zanamivir and oseltamivir have a small effect in reducing the time needed for alleviation of influenza symptoms, and that their use for both prevention and treatment must be decided after weighing the benefits against the risks of adverse reactions. This revision process started when the Japanese physician Keiji Hayashi requested a reappraisal of the review, pointing out that the Kaiser Study in 2000 supporting the review conclusions had used data primarily from unpublished clinical trials for its evaluation. The Kaiser Study was a meta-analysis of 10 industry-funded clinical trials conducted in the latter half of the 1990s, but while two of these trials had been published in peer-reviewed journals, the other eight were unpublished or only published as abstracts. The Cochrane review team then asked the Kaiser Study authors for the data, but because the data was not forthcoming, the meta-analysis was repeated without the Kaiser Study, resulting in a very different conclusion [22, 23]. This episode demonstrates that even Cochrane Systematic Reviews are at risk of reaching the wrong conclusion if the appropriate selection and critical examination of evaluated trials are neglected.
The influenza review was redone by Tom Jefferson of the Nordic Cochrane Centre in response to criticism of the review’s findings. Also based at the Nordic Cochrane Centre, a research group led by Peter C. Gøtzsche conducted a detailed review of the EMA evaluation of HPV vaccines, and identified failings in the basic evaluation materials and review methodology, including a lack of critical scrutiny and independent re-analysis of data provided by the vaccine makers, and omission of some clinical trials in a less-than-exhaustive review [24]. It is therefore inexplicable that the HPV vaccine review should uncritically accept the EMA evaluation without mentioning these findings from the Nordic Cochrane Centre.
5 Bias in Press Release
The way in which the HPV vaccine review was announced raises questions about bias. Cochrane’s press release introduced the first author M. Arbyn as citing the GACVS statement, “…the risk-benefit profile of prophylactic HPV vaccines remains favourable and unjustified claims of harm that lack biological and epidemiological evidence may affect the confidence of the public”. The HPV vaccine review has numerous limitations, as discussed above, but characterising expressions of doubt over the risk-benefit profile of HPV vaccines as “unjustified claims of harm” is more than enough to raise questions about the neutrality of this review.
Research on capturing the actual situation and identifying causes needs to progress in order to ascertain the true harms of pharmaceuticals, and the history of pharmaceutical scandals demonstrates that this process this takes time. Therefore, the approach required when reviewing harms should be one that seeks detection of risk signals rather than evidence of safety defined as the absence of any increased risk from an intervention. However, this basic approach is completely absent in the HPV vaccine review and press release.
In addition to the press release, the Cochrane website also presents feedback from the medical community in the form of comments from physicians welcoming the review findings, but it seems inappropriate to publish comments from physicians acting as consultants for GlaxoSmithKline and Merck (known as MSD in the US and Japan).
6 Conflict of Interest
(1) Authors’ conflict of interest
At publication of the final version of the protocol, conflicts of interest had already been identified for two of the review’s six authors. When the review results were subsequently published there were four authors (one of the two protocol authors with conflicts of interest remained as the lead author of the review). In addition, three of the remaining four authors (M. Arbyn, C. Simoens and PPL. Martin-Hirsch) had received travel grants from HPV vaccine manufacturers, which in and of itself raises questions about conflict of interest.
In particular, the lead author of the review, M. Arbyn, has continued to publish papers emphasizing the efficacy of HPV vaccines as lead author or co-author of papers on HPV vaccine trials. For example, ‘Prophylactic human papillomavirus vaccines: the beginning of the end of cervical cancer’ [25], published in the International Journal of Gynecological Cancer in 2004, was co-authored by M. Arbyn with J. Paavonen, who has written papers on clinical trials of Cervarix and Gardasil. Also, ‘Review of current knowledge on HPV vaccination’ [26], published in the Journal of Clinical Virology in 2008 was co-authored by M. Arbyn with J. Dillner, who has written papers on clinical trials of Gardasil.
M. Arbyn is also closely connected with EUROGIN, an international organisation of which MSD is the Platinum sponsor [27], and he has been selected as a program committee member for EUROGIN 2018, together with the likes of X. Bosch, J. Paavonen and J. Dillner, who have all written papers on vaccine clinical trials [28]. In 2012, M. Arbyn also wrote a review in EUROGIN 2011 which expressed an optimistic view about HPV vaccines [29].
It is notable that a 2015 Cochrane review on type 2 diabetes was withdrawn when a conflict of interest emerged between the review’s authors and the pharmaceutical industry [30]. As this withdrawal demonstrates, rather than unquestioningly accepting a review by a particular research group, Cochrane has, in the past, openly debated each review’s validity and made the necessary corrections and changes, even after publication of the review plan and review findings. Thus, it is difficult to understand Cochrane Review’s inaction in the face of these obvious and documented instances of conflict of interest.
(2) Donation of 130 million yen from the Bill & Melinda Gates Foundation
In 2016, Cochrane received roughly 130 million yen from the Bill & Melinda Gates Foundation [31], which promotes vaccination. Half of this amount was spent in the same year [32]. In 2016, Cochrane reported income of 6.8 million pounds (about one billion yen) and expenditures of 8.1 million pounds (about 1.2 billion yen). This donation constitutes more than 10% of Cochrane’s income for 2016, a significant fact that cannot be ignored.
7 Conclusion
On 24 March 2018, YAKUGI Ombudsperson ‘Medwatcher Japan’ held a symposium which had invited representatives of patient groups for victims of adverse reactions to HPV vaccines from the UK, Spain, Ireland, Colombia and Japan. It became clear from this meeting that each country had witnessed the same clinical characteristics of diverse and multi-layered adverse reactions to HPV vaccines and the same dramatically high number of postmarketing adverse event reports compared to other vaccines. It also emerged that some adverse reaction victims were told that they had ‘psychological problems’ by medical professionals and were thus unable to receive appropriate medical care. Moreover, not only has industry and government failed to put any relief measures in place due to lack of recognition of any causal relationship between HPV vaccines and adverse reactions, but some victims have been labelled ‘anti-vaccine’ and falsely accused of lying about symptoms by physicians and journalists promoting the vaccine, even though these patients had chosen to have the HPV vaccination because they believed it to be safe and effective [33].
Until these problems are recognized and understood, we are concerned that Cochrane’s HPV vaccine review, which is fundamentally flawed, will be used by people and organisations seeking to promote HPV vaccines. We urge Cochrane to live up to its stated mission of being “the benchmark for high-quality information about the effectiveness of health care.”
(English translation of the original Japanese document, ‘Critical Opinion on Cochrane Review of HPV Vaccines’; released on 7 June, 2018; revised on 8 June, 2018. http://www.yakugai.gr.jp/topics/topic.php?id=956)
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1Nordic Cochrane Centre, Rigshospitalet 7811, Tagensvej 21, 2100 Copenhagen, Denmark.
Summary
In a report uploaded on the Cochrane.org website on 3 September 2018 (1), Cochrane’s Editor in Chief and Deputy Editor in Chief responded to our analysis published in BMJ Evidence-Based Medicine on 27 July 2018 (2) of the Cochrane review of the HPV vaccines published on 9 May 2018 (3).
The Cochrane editors acknowledge (1) that our analysis (2) addresses the importance of the selection of data sources for reviews, and we hope that Cochrane will take the threat posed by reporting bias (4) more seriously by using clinical study reports, rather than journal publications.
The Cochrane editors claimed that we had “substantially overstated” our criticisms and they concluded that “Jørgensen et al made allegations that are not warranted and provided an inaccurate and sensationalized report of their analysis” (1).
Here we address the Cochrane editors’ findings and present our further assessment and additional findings.
In summary, we found that our analysis (2) was appropriat...
1Nordic Cochrane Centre, Rigshospitalet 7811, Tagensvej 21, 2100 Copenhagen, Denmark.
Summary
In a report uploaded on the Cochrane.org website on 3 September 2018 (1), Cochrane’s Editor in Chief and Deputy Editor in Chief responded to our analysis published in BMJ Evidence-Based Medicine on 27 July 2018 (2) of the Cochrane review of the HPV vaccines published on 9 May 2018 (3).
The Cochrane editors acknowledge (1) that our analysis (2) addresses the importance of the selection of data sources for reviews, and we hope that Cochrane will take the threat posed by reporting bias (4) more seriously by using clinical study reports, rather than journal publications.
The Cochrane editors claimed that we had “substantially overstated” our criticisms and they concluded that “Jørgensen et al made allegations that are not warranted and provided an inaccurate and sensationalized report of their analysis” (1).
Here we address the Cochrane editors’ findings and present our further assessment and additional findings.
In summary, we found that our analysis (2) was appropriate and that the Cochrane editors substantially ignored several of our criticisms (1):
1) The Cochrane editors’ cross referencing (1) with our HPV vaccine study index (5) showed that the Cochrane HPV review was incomplete and resulted in 8% additional eligible female participants (6,191/73,428). Due to the discrepancy with our analysis (2), we assessed our index again and found that the Cochrane HPV review should have included at least 35% (25,550/73,428) additional eligible females in its meta-analyses;
2) The Cochrane editors’ considerations on harms ignored several of our criticisms including the incomplete reporting of serious adverse events in several of the Cochrane HPV review’s included studies;
3) The Cochrane editors’ considerations of the trials’ adjuvant and vaccine comparators was ambiguous, opaque, inaccurate and ignored the fact that the studies only tested the vaccine antigens—not the vaccines;
4) The Cochrane editors’ response on the Cochrane HPV review’s included composite surrogate outcomes was superficial and did not consider the substantial bias and confounding that these outcomes involve;
5) The Cochrane editors’ assessment of the Cochrane HPV review authors’ conflicts of interest was incomplete and ignored several additional important conflicts of interest;
6) The Cochrane editors’ considerations on the media coverage did not recognize that it should be balanced and free from financial conflicts of interest;
7) The Cochrane editors’ response appeared to advocate scientific censorship, which we do not approve of;
8) In conclusion, our analysis (2) was appropriate, the Cochrane editors substantially ignored several of our criticisms (1) and the Cochrane review is still incomplete and ignores important evidence of bias.
1) The Cochrane editors’ cross referencing with our HPV vaccine study index
We used our index (5) to identify additional eligible studies for the Cochrane HPV vaccine review that included 73,428 women from 26 studies (3).
From our index (5), the Cochrane editors (1) identified:
1. “five [i.e., 5/26 = 19%] eligible completed studies with available data representing 5267 women [i.e., 5,267/73,428 = 7%, that] may have been missed from the Cochrane Review, as a consequence of the search being based on bibliographic databases rather than trials registers.”
2. One “Additional 9-valent [Gardasil 9] study NCT01047345,” adding 924 women to the numerator: 6,191/73,428 = 8% additional women.
3. “Five studies awaiting classification (not recruiting, but no results available) potentially relevant for the current Cochrane Review” that included 4,044 participants.
4. “Eight ongoing studies (actively recruiting, no results available) potentially relevant for the current Cochrane Review” that included 121,531 participants.
The Cochrane editors’ analysis (1) shows that the Cochrane HPV review was incomplete. In their “Appendix A”, the Cochrane editors updated 20 of the Cochrane HPV review’s meta-analyses (20/66, 30%) with the additional data and added seven meta-analyses of the HPV vaccine Gardasil 9 (1), but as of September 14 2018 they have not updated the Cochrane review itself with the additional data (3).
It is not clear why the Cochrane editors thought that our study index (5) “did not appear to identify any important eligible studies” (6). Our index was sent to the editors on 19 January 2018. The Cochrane review was published 110 days later on 9 May 2018 (3), but it seemingly took the editors only 25 days from launching their “investigation” on 9 August 2018 (6) to updating their Cochrane review on 3 September 2018 (7) with the missing studies.
Our initial assessment of the Cochrane HPV review’s included studies:
Initially, we had cross-referenced the study IDs from our index with the 26 included study IDs in the Cochrane HPV review’s “Appendix 6.1.1. Published reports included in the Cochrane review,” and found 20 studies not included in the review. For example, we did not find any of the 20 studies included in the Cochrane HPV review’s two serious adverse events analyses: “Figure 10” of journal publication data and “Analysis 7.6” of data that the Cochrane authors “considered to represent the most complete follow-up” (3). This led us to believe that the studies were not included in the Cochrane review. When we checked again, we found some of the studies in the review’s reference list (3). The Cochrane HPV reviewers chose to use idiosyncratic referencing with study IDs such as “Phase 2 trial (ph2,2v)”, “Immunobridging (ph3,2v)” and “CVT (ph3,2v), which made the study assessment complicated. For numbers of participants, we did not subtract the male participants that were included in three of the studies, as we should have done.
As stated in our index paper (5), our detective work involved a degree of uncertainty, as we did not want to dismiss any possibly eligible studies. Therefore, the index included a “possibly exist” category for studies for which we only had one verification source. Four studies in our analysis (2) had no numbers for randomised participants; these were “probably exist” studies. We have obtained additional information for three of these studies, but we are still not sure that the fourth study exists in clinical study report form, as the manufacturer (Merck) did not answer our request for this information (2,5).
In Table 1, we list the 20 studies (plus the additional one that the Cochrane editors identified: NCT01489527) that we identified as eligible but not included in the Cochrane HPV review.
Table 1: Our reassessment of the studies we had identified as additionally eligible for the Cochrane HPV vaccine review [*Key: RCT = randomised clinical trial]
Our analysis reinforces the view that Cochrane HPV review is incomplete. We found an additional 25,550 females (and possibly up to 30,195 for the Cochrane HPV review’s serious adverse events meta-analyses) that are eligible for the Cochrane HPV review’s meta-analyses. Furthermore, we found freely available clinical study reports for 6 of the 21 studies on GlaxoSmithKline’s trial register, which the Cochrane authors used data from. Clinical study reports are far more reliable than published reports (4), in particular in relation to possible serious harms. It is therefore not merely the studies the authors of the Cochrane HPV review missed; they also missed benefits and harms data from the studies they included. In addition, the criteria that the Cochrane authors used for inclusion of data in their primary serious adverse events analysis (Analysis 7.6) are not clear: “The primary analysis for these outcomes included data that we considered to represent the most complete follow-up” (3).
2) The Cochrane editors’ considerations on harms
The Cochrane HPV review’s harms analyses ("Comparison 7”) include seven meta-analyses (four of which report injection site harms) where the three most clinically important ones—deaths (Analysis 7.7), serious adverse events (Analysis 7.6) and systemic adverse events (Analysis 7.5)—contain errors or are incomplete.
Deaths
The Cochrane HPV review’s authors found 5% (90 vs. 86) more deaths in “Analysis 7.7” (journal publication and registry data) vs. “Figure 11 (only journal publication data). We found that this discrepancy reflects the difference between the study FUTURE III’s (V501-019) journal publication and registry entry (8 vs. 12 deaths). We also found that the Cochrane HPV review gave an incorrect number of deaths for the VIVIANE study (HPV-015): 13 deaths in the HPV vaccine group and 5 deaths in the AlOH3 group; according to VIVIANE’s journal publication (8), there were 14 deaths in the HPV vaccine group and 3 deaths in the Al(OH)3 group.
The Cochrane authors state that “The deaths reported in the trials had an identified cause, and none were assessed to be due to vaccination” (3), but such judgements are biased, particularly in industry sponsored trials, and the analysis of deaths should be based on all events (4).
Serious adverse events
There are 11% (4,758/4,291) more serious adverse events in “Analysis 7.6” (journal publication and register data) compared to “Figure 10” (only journal publication data). Since there were more serious adverse events and more deaths in the register entry data, we wonder why the Cochrane authors did not include register entry data for all their outcomes.
We also wonder why three (possibly four) studies were not included in the Cochrane HPV review’s serious adverse events meta-analyses (see Table 1). The Cochrane editors write that we “claim that the [Cochrane] review authors made an error in their reporting of serious adverse events in relation to the PATRICIA [HPV-008] study. This is not the case” (1). We stated that “the Cochrane authors did not explain what the serious adverse events consisted of or whether some of them were more common in the HPV vaccine groups,” (2) and gave the example that “the PATRICIA trial publication only included two thirds (1400/2028) of the serious adverse events listed on ClinicalTrials.Gov” (2). The 2,028 individual serious adverse events listed in ClinicalTrials.Gov are listed with the total denominators of randomised women for PATRICIA, for example, “Headache: participants affected/at risk: 5/9319 [in the HPV vaccine group] (0.05%) vs. 1/9325 [in the hepatitis a vaccine group] (0.01%)” (9), suggesting that the numbers represent participants with serious adverse events.
The Cochrane editors did not consider our highly relevant observations about the incomplete reporting of serious harms (1). For example, we wrote that “FUTURE I, FUTURE II and FUTURE III, which in total included 21 441 women with up to 4 years follow-up, only reported serious adverse events occurring within 14 days post-vaccination” (2). The editors did not comment on how such reporting of serious adverse events for only about 3% of the trial periods (FUTURE I, II and III: [(14 days*3 vaccinations)/(365 days*4 years)]) resulted in the Cochrane authors’ judgements of “low risk of bias” for reporting bias (1).
Both the 1st Cochrane HPV review protocol from 2011 (10) and the 2nd protocol from 2013 (11) list the primary outcome of "serious adverse events observed after four weeks of administration of the vaccine during the trial" (emphasis added), i.e., an incomplete reporting of serious adverse events was already a criterion at protocol stage.
Systemic adverse events
The Cochrane editors (1) did not comment on our criticism of the lack of studies (2)—including PATRICIA (HPV-008)—from the Cochrane HPV reviews’ “Analysis 7.5: systemic adverse events” (3). Analysis 7.5 is incomplete—in particular, for Cervarix studies where the Cochrane review only included numbers for “solicited general adverse events” for two studies (3): HPV-009 and HPV-015, although data for such events are eligible from several additional studies, for example, HPV-001, HPV-008, HPV-013, HPV-029, HPV-030, HPV-033, HPV-035, HPV-038 and HPV-058. The inclusion of these studies could change the Cochrane review’s conclusion that “Systemic events with general mild symptoms were similarly frequent in vaccinated recipients and placebo or control vaccine recipients” (3). As we wrote, “On ClinicalTrials.gov, PATRICIA has 7129 vs 6557 systemic events listed under ‘Results: Other Adverse Events (General disorders)’, which in itself is a significantly increased risk: RR 1.09 (95% CI 1.07 to 1.11)” (2).
Furthermore, the Cochrane authors did not address that “solicited general adverse events [Cervarix]” only were reported 7-days post-vaccination and “systemic adverse events [Gardasil]” only 14-days post-vaccination (3).
Assessment of safety signals
The Cochrane editors did not comment on our safety signal section (1). Some potential HPV vaccine-related harms to the nervous system—or “autonomic dysfunction syndromes,” as the Cochrane editors described them (1)—have been reported (2). The Cochrane authors should have used trial register data to investigate such safety signals; for example, if they had summarised the nervous system disorders from PATRICIA’s (HPV-008) ClinicalTrials.gov list of serious adverse events (9), they would have found more serious nervous system disorders in the HPV vaccine arm: 39/9,319 vs. 25/9,325 in the hepatitis A vaccine arm, risk ratio 1.56 (95% CI 0.95 to 2.58). The Cochrane authors write that “All estimates of adverse effects in our review were restricted to those reported from randomised trials and therefore could not detect rare events, for which post-marketing surveillance, pharmacovigilance activities and linkage studies, joining vaccine and morbidity registries, are needed” (3), but the review’s results might have been different had the authors included serious adverse events on both an individual and organ system level.
Additional points on the Cochrane editors’ harms assessment
The Cochrane HPV review (3) did not include the following harms categories that were reported in the eligible studies’ clinical study reports and in some journal publications: “unsolicited adverse events” (Cervarix), “medically significant conditions” (Cervarix), “new onset chronic/auto-immune disease” (Cervarix) and “new medical history” (Gardasil), even though the Cochrane authors mention the two first categories (reported in “Angelo 2014”) (3).
3) The editors’ considerations of the trials’ adjuvant and vaccine comparators
The Cochrane editors stated that “The trials comparators [sic] were unambiguously, transparently, and accurately described” (1), but in the Cochrane HPV review’s “Plain language summary” intended for lay readers, the review authors state that “The risk of serious adverse events is similar in HPV and control vaccines (placebo or vaccine against another infection than HPV” (emphasis added) (3), and the word “placebo” is repeated throughout the review and all its meta-analyses, which make the review ambiguous, opaque and inaccurate, as no included trial in the review used a placebo comparator.
The WHO states that using adjuvant or another vaccine as comparators instead of placebo makes it difficult to assess the harms of a vaccine (12). The HPV vaccine trials’ adjuvant comparators—Merck’s amorphous aluminium hydroxyphosphate sulphate (AAHS) and GlaxoSmithKline’s aluminium hydroxide (Al[OH]3)—have not been tested against an inert comparator in human trials. The adjuvants’ clinical properties are largely unknown; they are not regulated on their own, as regulators do not regard them as “active ingredients” (13). For example, Merck’s AAHS has a confidential formula and its properties are variable from batch to batch and even within batches (14). Because the HPV vaccines and their adjuvants had similar harms profiles, the manufacturers and the regulators concluded that the HPV vaccines are safe. However, this is like saying that cigarettes and cigars must be safe because they have similar harms profiles.
In addition, in those trials with a non-HPV vaccine comparator, the HPV vaccine aluminium adjuvant was used in nearly all the non-HPV comparator vaccines; for example, PATRICIA’s hepatitis A (Havrix) comparator contains Al(OH)3 (only the studies HPV-032 and HPV-063 used a non-aluminium containing comparator: the hepatitis a vaccine Aimmugen). Thus, the presence of AAHS or Al(OH)3 in nearly all arms of the studies thwarted the harms assessment. The studies tested the vaccine antigens—not the vaccines.
The exclusion criteria of the Cochrane HPV review’s included trials
The Cochrane editors (1) did not consider our point that many of the Cochrane HPV review’s included studies had excluded female participants “if they had received the [aluminium] adjuvants before or had a history of immunological or nervous system disorders; for example, in the PATRICIA trial with 18 644 women and the FUTURE II trial with 12 167 women” (2). These exclusion criteria lower the external validity of the studies and suggest that there were concerns about harms caused in such participants by the adjuvants.
4) The Cochrane editors’ response on the Cochrane HPV review’s included outcomes
The Cochrane editors state that “The selection of outcomes for benefits was appropriate and was consistent with World Health Organization [WHO] guidance” (1).
In 2004, the WHO recommended the use of cervical intraepithelial neoplasia or worse: CIN2+, as the primary outcome (15). CIN2+ is a composite surrogate outcome for cervical cancer and includes CIN2, CIN3, AIS and cervical cancer. In 2014, the WHO recommended persistent HPV infection instead of CIN2+ (16). The WHO’s CIN2+ and persistent HPV infection recommendations were approved to “accelerate vaccine development and evaluation” (16). Since 2014, HPV vaccines have only been required to show benefits against persistent HPV infection for getting regulatory approval as a vaccine against HPV related cancer (16).
According to the 2004 WHO recommendations, “Representatives of industry did NOT participate in the drafting of recommendations” of the use of CIN2+ (15), but researchers with conflicts of interest did participate in the recommendations, for example, Ian Frazer—the co-inventor of the HPV vaccine who “receives royalties from sales of HPV prophylactic vaccines, and is a consultant for Merck, [and] GlaxoSmithKline” (17). In 2014, all 17 members of the WHO group that recommended persistent HPV infection instead of CIN2+ as the primary outcome had financial ties with the HPV vaccine manufacturers. For example, the group included two patent-holders of the HPV vaccines antigens (or “virus-like particles”), who are entitled “to a limited share of royalties [that] the NIH [National Institutes of Health] receives for these technologies” (16).
Outcomes such as CIN2+ can be difficult to interpret, and significant clinical differences can be hidden in the Cochrane HPV review’s meta-analyses (3). For example, as an extreme example, if there were 5 participants with CIN2+ in the HPV vaccine group and 10 in the comparator group, the 5 participants in the HPV vaccine group could theoretically all have cervical cancer while the 10 in the comparator group could have CIN2 lesions that often regress (18,19).
The Cochrane editors (1) did not address our point that the VIVIANE study (HPV-015) included in its register entry “one case of ‘Adenocarcinoma of the cervix’ and one case of ‘Cervix cancer metastatic’ … in the HPV vaccine group” (2), and that the Cochrane HPV review includes a death caused by “Cervix cancer metastatic” in the HPV vaccine group, which was not mentioned in the main text (3). The Cochrane editors (1) did not address our point that the “Cochrane review’s 26 trials mainly included women below age 30 and used frequent cervical screening (often every 6 months) that did not reflect real-life practice (often every 3–5 years),” which also lower the external validity of the studies (2).
The Cochrane HPV review’s primary analysis—Analysis 1.1 that includes four trials (CVT, FUTURE I, II and PATRICIA)—was of “High‐grade cervical lesions in hr[high risk]HPV DNA negative women at baseline: CIN2+ associated with HPV 16/18 [HPV types 16 and 18 are targeted by the HPV vaccines]”. Analysis 1.1 is affected by selection bias. Up to 15% of cervical cancers may not contain HPV (20), and many cervical cancers are infected with more than one HPV type. For example, in the clinical study report that we received for PATRICIA (HPV-008), 63 of the 102 of CIN2+ cases were co-infected with two or more HPV types. In PATRICIA, if an HPV vaccine and a comparator participant were both diagnosed with CIN2+ and positive for HPV types 31 and 33, and HPV 16/18, 31 and 33, respectively, the HPV vaccine CIN2+ case would be assigned as caused by non-vaccine types (31 and 33) and excluded from the analyses (such as Analysis 1.1), while the comparator case would be caused by HPV 16/18 (HPV vaccine types) and included in the analyses; even though HPV types 31 and 33 could have caused the CIN2+ lesions in both participants. The Cochrane HPV review’s analyses of HPV infection (“Comparison 4, 5 and 6”) include 21 meta-analyses that all analyse infection of HPV vaccine types (i.e., HPV types 6, 11, 16 and 18)—not infection of any HPV type, which would decrease confounding by HPV co-infection.
Another issue with Analysis 1.1 (3) is the large proportion of excluded females: 23,676 participants were included, but the included four studies (CVT, FUTURE I, II and PATRICIA) randomised 43,732 participants, so 46% females were excluded. The Cochrane authors did not mention that FUTURE I, II and PATRICIA—that contained 49% (36,266/73,428) of the Cochrane review’s sample (3)—were stopped early when HPV 16/18-related CIN2+ was significantly reduced for the HPV vaccine populations. Trials stopped early for benefits are known to exaggerate the effects by 29% on average compared to completed trials of the same intervention (21).
The majority (24 of 31) of the Cochrane HPV review’s meta-analyses of histological outcomes (“Comparison 1, 2 and 3”) consider cervical lesions associated with HPV vaccine types (3). A less biased meta-analysis of cervical lesions is “Analysis 3.7: High‐grade cervical lesions in women regardless of baseline HPV DNA status: Any CIN2+ irrespective of HPV types, at least 1 dose.” The Cochrane HPV review’s primary analysis—Analysis 1.1—is much more statistically significant than Analysis 3.7 (3): risk ratio 0.01 (95% CI 0.01 to 0.05) vs. 0.79 (95% CI 0.65 to 0.97), i.e., a ratio of relative risks of 0.01 (95% CI 0.006 to 0.03), which may reflect the selection bias in Analysis 1.1.
Both the 1st Cochrane HPV review protocol from 2011 (10) and the 2nd protocol from 2013 (11) list "Invasive cervical cancer" as a primary outcome. The protocols state that the Cochrane authors “will contact study authors or data owners to request data on the outcomes that were not reported” (11), which they did not do for invasive cervical cancer. Also, “If data are reported for grouped end points, we will contact trial authors or data owners to request data on the separated outcomes” (11), which the authors did not do for CIN2+ and CIN3+. But the Cochrane authors could have looked in the journal publications; for example, CIN3 irrespective of HPV type in intention-to-treat populations was reported in FUTURE I (22) (“79/2723 [in the HPV vaccine group] vs. 72/2732 [in the AAHS group]”) and FUTURE II (23) (“127/6087 [in the HPV vaccine group] vs. 161/6080 [in the AAHS group]”: in total 206/8,810 vs. 233/8,812; risk ratio 0.91 [95% CI 0.66 to 1.27]).
Furthermore, the Cochrane authors write that “No results were found for the outcomes any [sic] CIN3+ or AIS+ irrespective of HPV type” (3). If the Cochrane authors had looked in the freely available clinical study reports on GlaxoSmithKline’s trial register that the authors assessed, they would have found the outcomes CIN3+ irrespective of HPV type for PATRICIA (86/9,319 vs. 158/9,325) and HPV-032/063 combined (9/464 vs. 14/463).
5) The Cochrane editors’ assessment of the Cochrane authors’ conflicts of interest
The Cochrane editors state that “The review was compliant with Cochrane’s current conflict of interest policy” (1). If that is the case, we believe Cochrane should reconsider its policy.
The Cochrane HPV vaccines are expensive blockbuster vaccines generating billions of dollars of revenue (24), and the Cochrane review ought, therefore, to have been independent of any financial conflicts of interests.
The Cochrane editors are confident that the Cochrane authors have no relevant conflicts of interest (2). We do not agree. For example, the Cochrane HPV review’s first author, Professor Marc Arbyn—who, according to the Cochrane review (3), only “received travel grants from MSD‐Sanofi‐Pasteur and GSK, (ceased in 2008)”—was until 2008 on GlaxoSmithKline’s advisory board: “Marc Arbyn (GSK advisory Board (interrupted in 2008))”) (25); in 2011, “EUROGIN covered his [Marc Arbyn’s] travel and lodging expenses … EUROGIN conferences are financially supported by a range of pharmaceutical companies with an interest in cervical cancer” (26); in 2014, “Marc Arbyn's research unit at The Scientific Institute of Public Health received research support not exceeding 48,000 Euros from MSD-Sanofi Pasteur [co-manufacturer of Gardasil] for a surveillance study of the effects of HPV vaccination in Belgium (SEHIB study) ... His [Marc Arbyn’s] unit has also received research support from BD, Bio-Greiner, Abbot, and Cepheid for validation studies of HPV genotyping tests (through the VALGENT studies, valued at 21,000, 21,000 & 38,000€ respectively)” (27); and in 2018, Marc Arbyn is on the EUROGIN programme committee where Merck is a platinum sponsor (28). The Cochrane review’s last author, Dr. Markowitz is sponsored by Merck via Medscape (“sponsored by the manufacturer of the quadrivalent vaccine (“supported by an independent educational grant from Merck”) (29).
The Cochrane editors (1) do not think that the Costa Rica trial (“CVT”, aka HPV-009) was industry funded, and they refer to its publication in JAMA that states that the trial was "funded by the NCI (grant N01-CP-11005).” The editors write, with reference to JAMA, that “Vaccine was provided for our trial by GSK [GlaxoSmithKline] Biologicals, under a Clinical Trials Agreement with the NCI" (1). GlaxoSmithKline also provided support for aspects of the trial associated with regulatory submissions under “FDA BB-IND 7920” (30). We consider this industry funding.
6) The Cochrane editors’ assessment of the media coverage
The Cochrane editors (1) did not comment on our note that “Two of the experts had financial conflicts of interest with the HPV vaccine manufactures … [and that] No expert criticised the review” (2).
The editors (1) write that “press coverage could be made more explicit on our organizational websites and other communications, essentially noting that these opinions represent personal perspectives from a range of contributors and do not reflect the views or policies of Cochrane” (1). We agree, but stress that Cochrane’s press officer ought to only include researchers with no financial conflicts of interest.
7) The Cochrane editors appear to advocate scientific censorship
The Cochrane editors wrote that “Scientific debate is to be welcomed, and differences of opinion between different Cochrane 'voices' is not unexpected. However, public confidence may be undermined, unnecessary anxiety caused, and public health put at risk if that debate is not undertaken in an appropriate way. This is especially true when such debates take place in public. There is already a formidable and growing anti-vaccination lobby. If the result of this controversy is reduced uptake of the vaccine among young women, this has the potential to lead to women suffering and dying unnecessarily from cervical cancer.” We believe that our criticism of the Cochrane HPV review is appropriate and has general interest. We believe that providing an assessment of all the evidence reduces uncertainty and allows the public to make informed decisions based on the benefits and the harms of HPV vaccines. Debates over sources of evidence must take place in public, especially when public health interventions are at stake.
8) Conclusion
We did not “substantially overstate” (1) our criticisms of the Cochrane HPV vaccine review (2). The Cochrane editors substantially ignored several of our criticisms. The Cochrane HPV review is still incomplete and ignores important evidence of bias.
The Cochrane editors stated that “Some of the criticisms will inform the next version of this Cochrane Review and the planned review of comparative studies of HPV vaccines,” and that the editors “recognize public concerns about the aluminium-based adjuvants” (1).
The editors also stated that “reliance on the published reports in scientific journals may introduce bias due to incomplete and selective reporting” (1). We agree and remind the Cochrane editors that the Cochrane review on neuraminidase inhibitors substantially changed its conclusions after it got updated and became based on clinical study reports instead of journal publications (31).
With our analysis (2), we have contributed to a scientific debate in an area that is complex and biased. The Cochrane authors stated that they will make a “Request for non‐published available data” such as clinical study reports that “will be integrated in future updates of the review” (3). We can offer them these data, which we have used for our own systematic review that we have submitted for publication.
Article info
Conflicts of interest: LJ and PCG have no conflicts of interest to declare. TJ was a recipient of a UK National Institute for Health Research grant for a Cochrane review of neuraminidase inhibitors for influenza. In addition, TJ receives royalties from his books published by Il Pensiero Scientifico Editore, Rome and Blackwells. TJ is occasionally interviewed by market research companies about phase I or II pharmaceutical products. In 2011-13, TJ acted as an expert witness in litigation related to the antiviral oseltamivir, in two litigation cases on potential vaccine-related damage and in a labour case on influenza vaccines in healthcare workers in Canada. He has acted as a consultant for Roche (1997-99), GSK (2001-2), Sanofi-Synthelabo (2003), and IMS Health (2013).In 2014 he was retained as a scientific adviser to a legal team acting on oseltamivir. TJ has a potential financial conflict of interest in the drug oseltamivir. In 2014-16, TJ was a member of three advisory boards for Boerhinger Ingelheim. TJ was holder of a Cochrane Methods Innovations Fund grant to develop guidance on the use of regulatory data in Cochrane reviews. TJ was a member of an independent data monitoring committee for a Sanofi Pasteur clinical trial on an influenza vaccine. Between 1994 and 2013, TJ was the coordinator of the Cochrane Vaccines Field. TJ was a co-signatory of the Nordic Cochrane Centre Complaint to the European Medicines Agency (EMA) over maladministration at the EMA in relation to the investigation of alleged harms of HPV vaccines and consequent complaints to the European Ombudsman. TJ is co-holder of a John and Laura Arnold Foundation grant for development of a RIAT support centre (2017-2020) and Jean Monnet Network Grant, 2017-2020 for The Jean Monnet Health Law and Policy Network. TJ is an unpaid collaborator to the project Beyond Transparency in Pharmaceutical Research and Regulation led by Dalhousie University and funded by the Canadian Institutes of Health Research (2018-2022).
Authors' experience: PCG has co-authored 17 Cochrane reviews, including several reviews based on clinical study reports. TJ has co-authored 17 Cochrane reviews including the first Cochrane review that used clinical study reports. LJ has co-authored several articles on the HPV vaccines.
Authors' contributions: LJ wrote the first draft. LJ, PCG and TJ contributed to the conception, drafting,
critical revision for important intellectual content and the final approval of the article.
Acknowledgements: We would like to thank the Cochrane editors for taking our analysis into consideration and the BMJ-EBM editors for allowing us to respond via their journal.
Provenance and peer review: Commissioned; not externally peer-reviewed.
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29. Conflicts of interests. Available from: http://www.nogracias.eu/wp-content/uploads/2013/05/vacc-HPV-Cochrane_HPV...
30. Herrero R. Human Papillomavirus (HPV) Vaccines: Limited Cross-Protection against Additional HPV Types. J Infect Dis. 2009 Apr 1;199(7):919–22.
31. Jefferson T, Jones MA, Doshi P, Del Mar CB, Hama R, Thompson MJ, et al. Neuraminidase inhibitors for preventing and treating influenza in adults and children. The Cochrane Library. John Wiley & Sons, Ltd; 2014. Available from: http://onlinelibrary.wiley.com/doi/10.1002/14651858.CD008965.pub4/full
Back in May I submitted a comment to the review by Aubyn et al, and when it was not published received an assurance from Cochrane admin that was because the site was undergoing up-date. I am dismayed but not surprised to find that it never appeared, though it is still germane:-
"It concerns me that the authors of this study failed to contest the validity of trials that did not mostly take place against genuine placebo (i.e. saline), and even use the term "placebo" repeatedly. Do they not bear a huge responsibility by not taking this issue on, as if it is all right for this kind of methodology to become a norm of modern "scientific" practice and as something which does not affect the meaning and usefulness of the safety results?
"Ordinary citizens, most of whom will have learned about good scientific practice at school, might assume that these trials were against genuine placebo and I find no clear explanation of the issue here, let alone in the "Plain Language Summary"."
I was obviously stating the issue in a simplistic manner. The public probably mostly believe that the science behind these products would have been conducted at the highest standard before marketing, but this is very far from evident - and evident at a level which they are more than capable of understanding. Yet they continue to be shielded from the truth. The authors and this journal ought to be commended for standing against the profession...
Back in May I submitted a comment to the review by Aubyn et al, and when it was not published received an assurance from Cochrane admin that was because the site was undergoing up-date. I am dismayed but not surprised to find that it never appeared, though it is still germane:-
"It concerns me that the authors of this study failed to contest the validity of trials that did not mostly take place against genuine placebo (i.e. saline), and even use the term "placebo" repeatedly. Do they not bear a huge responsibility by not taking this issue on, as if it is all right for this kind of methodology to become a norm of modern "scientific" practice and as something which does not affect the meaning and usefulness of the safety results?
"Ordinary citizens, most of whom will have learned about good scientific practice at school, might assume that these trials were against genuine placebo and I find no clear explanation of the issue here, let alone in the "Plain Language Summary"."
I was obviously stating the issue in a simplistic manner. The public probably mostly believe that the science behind these products would have been conducted at the highest standard before marketing, but this is very far from evident - and evident at a level which they are more than capable of understanding. Yet they continue to be shielded from the truth. The authors and this journal ought to be commended for standing against the professional tide.
I also note the forthcoming exhaustive documentary history 'The HPV Vaccine On Trial: Seeking Justice for a Generation Betrayed', by Mary Holland, Kim Mack Rosenberg and Eileen Iorio (with an introduction by Luc Montagnier) to be published on 2 October.
These matters must be hidden from public view any longer.
"In older women, vaccinated between 25 to 45 years of age, the effects of HPV vaccine on precancer are smaller, which may be due to previous exposure to HPV. The risk of precancer associated with HPV16/18 is probably reduced from 145/10,000 in unvaccinated women to 107/10,000 women following HPV vaccination (moderate certainty). The risk of any precancer is probably similar between unvaccinated and vaccinated women (343 versus 356/10,000, moderate certainty)."
Cochrane estimates a significant effect of the vaccine on HPV 16/18 associated precancer in the 25-45 age group, but that effect disappears when risk of precancer of all (HPV) types is calculated. It is a matter of simple logic that for the positive (desired) effect on type 16/18 precancer to be offset in this way, the vaccine must have a corresponding negative (undesired) effect on precancer associated with other HPV types.
The observation holds for all age groups, but is more pronounced in the older group. It is reasonable to assume that if one took, say, a 35 to 45 years old group, the total undesired result of the HPV vaccination could be statistically significant.
If my reading of these numbers is too simplistic, it would be good to get a clarification, since the quoted passage appears right in the Summary with no further comments.
In Europe, the vaccine is routinely recommended to women of all ages.
"In older women, vaccinated between 25 to 45 years of age, the effects of HPV vaccine on precancer are smaller, which may be due to previous exposure to HPV. The risk of precancer associated with HPV16/18 is probably reduced from 145/10,000 in unvaccinated women to 107/10,000 women following HPV vaccination (moderate certainty). The risk of any precancer is probably similar between unvaccinated and vaccinated women (343 versus 356/10,000, moderate certainty)."
Cochrane estimates a significant effect of the vaccine on HPV 16/18 associated precancer in the 25-45 age group, but that effect disappears when risk of precancer of all (HPV) types is calculated. It is a matter of simple logic that for the positive (desired) effect on type 16/18 precancer to be offset in this way, the vaccine must have a corresponding negative (undesired) effect on precancer associated with other HPV types.
The observation holds for all age groups, but is more pronounced in the older group. It is reasonable to assume that if one took, say, a 35 to 45 years old group, the total undesired result of the HPV vaccination could be statistically significant.
If my reading of these numbers is too simplistic, it would be good to get a clarification, since the quoted passage appears right in the Summary with no further comments.
In Europe, the vaccine is routinely recommended to women of all ages.
References
[1] Arbyn M, Xu L, Simoens C, Martin-Hirsch PPL. Prophylactic vaccination against human papillomaviruses to prevent cervical cancer and its precursors. Cochrane Database Syst Rev. 2018; (5): CD009069.
The number of systematic reviews being published each year is actually much larger than the already impressive number of 10,000 quoted. In 2017 over 20,000 were published; 20,661 are cited in the KSR Evidence database in early August 2018. KSR Evidence, includes all systematic reviews and meta-analyses published since 2015 and for many reviews provides a critical appraisal and a short, accessible bottom line. www.ksrevidence.com
I searched PubMed for the retraction notices. The 3 retracted articles published by Elsevier have no retraction notices in PubMed. Retraction notices for the 2 articles in the Journal of the American Society of Hypertension were published in vol. 9, issue 10, this issue is indexed in PubMed and articles citations are in PubMed but the two retraction notices are missing. "Publishers of journals in PubMed must submit citation and abstract" (PubMed FAQ for publishers), these two notices should normally have been submitted by the publisher. As for the article published in the European Journal of Pharmaceutical Sciences, no retraction notice was found, information about the article being retracted is available in the original article but, as no retraction notice seems to be available, there is no information about the retracted status in PubMed. As PubMed is often the source used by researchers doing a study on retractions of articles (e.g. PMID: 28683764, PMID 26797347, PMID: 24928194) it is important to find this information in the database. Publishers should always publish retraction notices for retracted articles and submit the citations to PubMed when the journal is indexed in this database.
In their editorial, Brodersen et al. present two types of overdiagnosis. Their two types appear to be identical to two types of overdiagnosis we identified in research published in 2016 (Rogers WA and Mintzker Y. Getting clearer on overdiagnosis. J Eval Clin Prac 2016;22: 580-587). In that paper, we provide a detailed account of maldetection overdiagnosis and misclassification overdiagnosis, together with an analysis of the relevance of these two different types.
This matter, including our request for a correction, is fully explained in our letter published in this journal: Response to Brodersen et al’s ’Overdiagnosis: what it is and what it isn’t' (http://ebm.bmj.com/content/early/2018/03/29/bmjebm-2018-110948).
The authors addressed important limitations in the Cochrane HPV vaccine review and stated that the Cochrane HPV vaccine review authors should make every effort to identify all trials and the trials' limitations in their conclusion. We (members of Medwatcher Japan [YAKUGAI Ombusperson], an NGO that was launched in 1997 to monitor and prevent drug-induced disasters) strongly support their conclusions.
Medwatcher Japan released an open letter (original Japanese document) ‘Critical Opinion on Cochrane Review of HPV Vaccines’ dated on June 8th, 2018 and raised some comments concerning the content of the Cochrane HPV vaccine review and the governance of the Cochrane organisation. We have submitted the open letter (English translation of the original Japanese document) to some relevant parties in charge of Cochrane on August 13th, 2018. Furthermore, we have submitted the short version which was limited to the specifics of the contents of the Cochrane HPV vaccine review via the feedback system on The Cochrane Library on August 31st, 2018. It has been confirmed that the short version was published via the Cochrane Library feedback system. We have not, however, received any responses directly from the Cochrane.
Therefore, in addition to the points raised in this article by Jørgensen et al., we would like to address the following key comments concerning the content of the Cochrane review in this response:
1. Since the effectiveness claimed in the Cochrane revi...
Show MoreThe Cochrane HPV vaccine review was incomplete and ignored important evidence of bias: Response to the Cochrane editors
Lars Jørgensen, LJ (lj@cochrane.dk), 1
Peter C. Gøtzsche, PCG (pcg@cochrane.dk), 1
Tom Jefferson, TJ (tj@cochrane.dk), 1
1Nordic Cochrane Centre, Rigshospitalet 7811, Tagensvej 21, 2100 Copenhagen, Denmark.
Summary
In a report uploaded on the Cochrane.org website on 3 September 2018 (1), Cochrane’s Editor in Chief and Deputy Editor in Chief responded to our analysis published in BMJ Evidence-Based Medicine on 27 July 2018 (2) of the Cochrane review of the HPV vaccines published on 9 May 2018 (3).
The Cochrane editors acknowledge (1) that our analysis (2) addresses the importance of the selection of data sources for reviews, and we hope that Cochrane will take the threat posed by reporting bias (4) more seriously by using clinical study reports, rather than journal publications.
The Cochrane editors claimed that we had “substantially overstated” our criticisms and they concluded that “Jørgensen et al made allegations that are not warranted and provided an inaccurate and sensationalized report of their analysis” (1).
Here we address the Cochrane editors’ findings and present our further assessment and additional findings.
In summary, we found that our analysis (2) was appropriat...
Show MoreBack in May I submitted a comment to the review by Aubyn et al, and when it was not published received an assurance from Cochrane admin that was because the site was undergoing up-date. I am dismayed but not surprised to find that it never appeared, though it is still germane:-
"It concerns me that the authors of this study failed to contest the validity of trials that did not mostly take place against genuine placebo (i.e. saline), and even use the term "placebo" repeatedly. Do they not bear a huge responsibility by not taking this issue on, as if it is all right for this kind of methodology to become a norm of modern "scientific" practice and as something which does not affect the meaning and usefulness of the safety results?
"Ordinary citizens, most of whom will have learned about good scientific practice at school, might assume that these trials were against genuine placebo and I find no clear explanation of the issue here, let alone in the "Plain Language Summary"."
I was obviously stating the issue in a simplistic manner. The public probably mostly believe that the science behind these products would have been conducted at the highest standard before marketing, but this is very far from evident - and evident at a level which they are more than capable of understanding. Yet they continue to be shielded from the truth. The authors and this journal ought to be commended for standing against the profession...
Show MoreThe Cochrane Review of the HPV vaccine states :
"In older women, vaccinated between 25 to 45 years of age, the effects of HPV vaccine on precancer are smaller, which may be due to previous exposure to HPV. The risk of precancer associated with HPV16/18 is probably reduced from 145/10,000 in unvaccinated women to 107/10,000 women following HPV vaccination (moderate certainty). The risk of any precancer is probably similar between unvaccinated and vaccinated women (343 versus 356/10,000, moderate certainty)."
Cochrane estimates a significant effect of the vaccine on HPV 16/18 associated precancer in the 25-45 age group, but that effect disappears when risk of precancer of all (HPV) types is calculated. It is a matter of simple logic that for the positive (desired) effect on type 16/18 precancer to be offset in this way, the vaccine must have a corresponding negative (undesired) effect on precancer associated with other HPV types.
The observation holds for all age groups, but is more pronounced in the older group. It is reasonable to assume that if one took, say, a 35 to 45 years old group, the total undesired result of the HPV vaccination could be statistically significant.
If my reading of these numbers is too simplistic, it would be good to get a clarification, since the quoted passage appears right in the Summary with no further comments.
In Europe, the vaccine is routinely recommended to women of all ages.
Reference...
Show MoreThe number of systematic reviews being published each year is actually much larger than the already impressive number of 10,000 quoted. In 2017 over 20,000 were published; 20,661 are cited in the KSR Evidence database in early August 2018. KSR Evidence, includes all systematic reviews and meta-analyses published since 2015 and for many reviews provides a critical appraisal and a short, accessible bottom line. www.ksrevidence.com
I searched PubMed for the retraction notices. The 3 retracted articles published by Elsevier have no retraction notices in PubMed. Retraction notices for the 2 articles in the Journal of the American Society of Hypertension were published in vol. 9, issue 10, this issue is indexed in PubMed and articles citations are in PubMed but the two retraction notices are missing. "Publishers of journals in PubMed must submit citation and abstract" (PubMed FAQ for publishers), these two notices should normally have been submitted by the publisher. As for the article published in the European Journal of Pharmaceutical Sciences, no retraction notice was found, information about the article being retracted is available in the original article but, as no retraction notice seems to be available, there is no information about the retracted status in PubMed. As PubMed is often the source used by researchers doing a study on retractions of articles (e.g. PMID: 28683764, PMID 26797347, PMID: 24928194) it is important to find this information in the database. Publishers should always publish retraction notices for retracted articles and submit the citations to PubMed when the journal is indexed in this database.
In their editorial, Brodersen et al. present two types of overdiagnosis. Their two types appear to be identical to two types of overdiagnosis we identified in research published in 2016 (Rogers WA and Mintzker Y. Getting clearer on overdiagnosis. J Eval Clin Prac 2016;22: 580-587). In that paper, we provide a detailed account of maldetection overdiagnosis and misclassification overdiagnosis, together with an analysis of the relevance of these two different types.
This matter, including our request for a correction, is fully explained in our letter published in this journal: Response to Brodersen et al’s ’Overdiagnosis: what it is and what it isn’t' (http://ebm.bmj.com/content/early/2018/03/29/bmjebm-2018-110948).
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