AUTH/2528/8/12 - Genzyme v Shire

VPRIV press release

  • Received
    21 August 2012
  • Case number
    AUTH/2528/8/12
  • Applicable Code year
    2012
  • Completed
    15 March 2013
  • No breach Clause(s)
    7.2
  • Breach Clause(s)
    1.8, 2, 4.1, 7.2, 7.3, 8.1, 14.1, 14.5, 22.1 and 22.2
  • Sanctions applied
    Undertaking received
  • Additional sanctions
  • Appeal
    Appeal by respondent and complainant
  • Review
    May 2013

Case Summary

Genzyme Therapeutics alleged that a press release issued by Shire Pharmaceuticals, entitled 'Shire's VPRIV (velaglucerase alfa for injection) Shows Significant Improvement in Gaucher-Related Bone Disease', contained disparaging comparisons with its product Cerezyme (imiglucerase) that were not accurate, balanced, fair or based on up-to-date information. They were based on an analysis of exploratory endpoints in a small subgroup using treatment arms that had significant and relevant differences at baseline. Put simply, this analysis was not designed properly to assess changes in bone mineral density (BMD). The press release also selectively focused on some data and endpoints, but not others.
 
Genzyme noted that Shire had placed the press release on its global website and had also provided a copy of it through its UK public relations agents to a UK patient group.
 
The detailed response from Shire is given below.
 
Genzyme noted that the comparison of changes in BMD for patients taking VPRIV and Cerezyme was based on a number of subgroup retrospective analyses of data collected from the original 2008- 2009 Phase III study. BMD was not a primary or secondary endpoint of the study; rather, it was measured as an 'exploratory' endpoint. As an 'exploratory' endpoint, BMD Z-scores could not be used as evidence of clinical superiority. Although a statement that the evaluation of BMD was exploratory was in the fifth paragraph of the press release, the press release was still unbalanced and unfair.
 
The press release misleadingly implied that the statistical significance and comparative/superiority efficacy claims were properly derived from an analysis of a prospectively defined primary endpoint.
 
Genzyme alleged that the press release selectively used mean and median data to convey the message that VPRIV improved BMD more than Cerezyme. Specifically, the press release only included information on the median baseline Z-scores and not the mean or average baseline, even though when describing improvements in BMD, the press release switched to mean changes from baseline. While Shire argued that the median allowed for a fair presentation of the central value and was not influenced by outlying values (unlike presentation of the mean), this argument was not credible when the press release subsequently switched to mean changes from baseline. In addition, the median baseline Z-scores were dramatically closer than the mean baseline Z-scores. As a result, the press release conveyed a misleading message that the patients' BMD levels were more comparable than they actually were.
 
Genzyme noted that had Shire adjusted properly for baseline differences, patients taking Cerezyme might have demonstrated a greater percentage improvement in BMD than patients taking VPRIV. As such, the press release made inaccurate and misleading superiority claims.
 
Genzyme noted that although Shire acknowledged the imbalances with baseline lumbar spine Z-scores, it asserted that the results were robust because it had obtained similar results after adjusting for this difference. However, the results after adjusting for this difference were from a 'within-group' analysis, which could not support comparative/superiority efficacy claims. Thus, failure to disclose in the press release that no conclusion regarding group-to-group comparisons could be made based on the data from the study was misleading.
 
Genzyme noted that the title of the press release made the general conclusion that VPRIV showed significant improvement in 'Gaucher-Related Bone Disease'. However, the body of the press release only reported the data relating to BMD measurements in the lumbar spine. For example, Shire did not include femoral neck BMD Z-scores because VPRIV was not shown to have a positive effect on femoral BMD after 9 months. Thus, the BMD Z-scores were presented selectively and presented an inaccurate and misleading efficacy claim that VPRIV improved BMD more than Cerezyme.
 
Genzyme, however, alleged that the press release went beyond reporting the scientific data from the study at issue and made comparative/superiority claims. In addition, the BMD data presented in the press release did not constitute an up-to-date evaluation of all the evidence because it did not include data that showed that Cerezyme had statistically significant results on bone disease, including BMD measurements. Genzyme alleged that the analysis in the press release was not accurate, balanced, fair, objective, unambiguous, or based on an up-to-date evaluation of all the evidence in breach of the Code.
 
With regard to whether the press release came within the scope of the Code, the Panel noted that it had been issued by Shire plc, in Switzerland and published on the global, but not the UK, website. There was no reference to the use or availability of VPRIV in the UK although UK contact telephone numbers were provided. Readers were advised to consult local prescribing information and told where to find the US prescribing information. The Panel noted Shire's submission that the press release was not directed to a specifically UK audience. However, the Panel further noted that the press release had been sent to, inter alia, a UK patient organisation and therefore considered that the content of the press release came within the scope of the Code and had to comply with it.
 
The Panel noted that the title of the press release was 'Shire's VPRIV (velaglucerase alfa injection) Shows Significant Improvement in Gaucher-Related Bone Disease'. Below this, in slightly smaller text, was the prominent subheading 'In a head-to-head trial between VPRIV and Cerezyme (imiglucerase), only patients treated with VPRIV experienced statistically significant improvement in lumbar spine bone mineral density'. The press release then detailed the results of a head-to-head Phase III clinical study (HGT-GCB-039) and follow on extension trial (HGT-GCB-044) with VPRIV in relation to lumbar spine BMD, stating, inter alia, that clinically and statistically significant improvement from baseline in mean lumbar spine Z-score was seen at nine months of treatment with VPRIV, but not in the cohort of patients treated with Cerezyme. The Panel disagreed with Shire's repeated assertions that no comparative or superiority claims were made.
 
The Panel noted from the entry on ClinicalTrials.gov for the trial HGT-GCB-039 that the title of the study was 'Study of Gene-Activated Human Glucocerebrosidase (GA-GCB) ERT Compared With Imiglucerase in Type I Gaucher Disease'. Under the section 'Purpose' was the statement 'The purpose of this non-inferiority study is to evaluate the efficacy and safety of GA-GCB (velaglucerase alfa) administered every other week in comparison to imiglucerase in treatment naïve patients with type 1 Gaucher disease'. The primary outcome measures were mean change from baseline to month 9 in haemoglobin concentration for each treatment group and the secondary outcome measures as change from baseline to month 9 in platelet counts; change from baseline to month 9 in normalized liver volume; change from baseline to month 9 in normalized spleen volume; change from baseline to month 9 in plasma chitotriosidase; change from baseline to month 9 in plasma chemokine (C-C motif) ligand 18; number of patients who developed antibodies to treatment and a comparison of GAGCB and imiglucerase on the earliest time to respond as assessed via haemoglobin concentration.
 
The entry on ClinicalTrials.gov for the trial HGT-GCB- 044 noted that the title of the study was 'An Open- Label Extension Study of GA-GCB ERT in Patients With Type 1 Gaucher Disease'. The purpose of the study was to evaluate the long-term safety of every other week dosing of VPRIV intravenously in patients with type 1 Gaucher disease, the primary outcome measure was the evaluation of safety and the secondary outcome measures were the evaluation of haematological parameters and organomegaly.
 
The Panel noted that the poster (Zimran et al 2012), upon which the press release was based, was entitled 'Bone mineral density response to enzyme replacement therapy over 2 years in adults with type 1 Gaucher disease'. It explained that the study HGTGCB- 039 was a Phase III, randomized, parallel-group trial in patients with type 1 Gaucher disease; onegroup was allocated VPRIV (n=13) and the other Cerezyme (n=11) therapy for 9 months. In the extension study (HGT-GCB-044), which was ongoing, those patients taking VPRIV continued to do so and those taking Cerezyme were switched to VPRIV. BMD was measured for the lumbar spine and femoral neck at baseline, 9 and 24 months relative to baseline. The statistical analysis section of the poster referred to the BMD assessment being prespecified as exploratory and thus there were no prespecified hypotheses. The poster went on to state that because there were no specific bone-related inclusion or exclusion criteria in the protocols for the studies and the randomization was not stratified by BMD, there were imbalances between the two treatment arms at baseline such that the mean lumbar spine BMD Z-score in the VPRIV group was - 1.56 and -0.57 in the Cerezyme group (although the press release referred to the more closely matched median baseline figures of -1.46 and -0.86, respectively). Additional analyses adjusting for baseline lumbar spine bone status were performed in patients with a baseline lumbar spine T-score <-1 (excluding patients with normal density) and in patients with a baseline lumbar spine Z-score <-1 but this reduced the number of patients in each treatment arm (VPRIV (n=9) and Cerezyme (n=4)). Although this additional analysis confirmed the lumbar spine BMD Z-score results in the wider patient group the Panel noted that there were only 4 patients in the Cerezyme group and more than double that in the VPRIV group.
 
The Panel noted that despite the limitations of the data noted above, the title and subheading of the press release as set out above was unequivocal. A further statement read 'Results from a head-to-head Phase III study (HGT-GCB-039) of VPRIV and Cerezyme, and follow-on extension trial (HGT-GCB- 044) of VPRIV, demonstrate a statistically significant improvement in lumbar spine (LS) BMD in Gaucher patients starting at nine months of treatment with VPRIV (P<0.05)'. The only reference to BMD being evaluated as an exploratory endpoint was in a sentence in the fifth paragraph of the press release which detailed how BMD was measured.
 
The Panel did not accept Shire's submission that the press release made no comparative claims. The Panel was concerned that the press release was not clear that the extension study from which the BMD results were obtained was not a head-to-head study of VPRIV and Cerezyme; it gave a contrary impression in this regard. The extension study compared BMD results within each group to baseline. The press release was misleading on this point and a breach of the Code was ruled. This ruling was appealed by Shire. In addition, the Panel did not consider that it was sufficiently clear from the press release that BMD was a pre-specified exploratory endpoint. The only reference to this was towards the end of the press release and there was no explanation that no confirmatory clinical conclusions could be drawn from such an endpoint. In the opinion of the Panel the press release invited the reader to draw such conclusions. Exploratory endpoints could not be used as the basis for a robust comparison of medicines. The Panelconsidered that the press release was misleading in that regard and ruled a breach of the Code. This ruling was appealed by Shire.
 
The Panel considered that the allegations about sample size and use of mean/median in relation to the changes in BMD were covered by its comments about the presentation of the BMD data in the press release. The Panel considered that overall the press release was not a fair reflection of the data. Insufficient information had been provided to enable the reader to properly assess how much weight to attach to the findings. A breach of the Code was ruled. This ruling was appealed by Shire.
 
The Panel noted Genzyme's allegation that the press release did not include the BMD Z-scores relating to the neck of the femoral bone. The press release stated that the femoral neck changes from baseline in both cohorts were not significant at either 9 or 24 months. The Panel noted its comments and ruling above in relation to BMD. However, and on balance, in relation to the very narrow ground alleged, the Panel did not consider that the press release was misleading solely because it failed to quantify the femoral neck BMD as alleged and thus no breach of the Code was ruled. This ruling was not appealed.
 
In considering the appeals noted above the Appeal Board noted the press release was based upon the poster presented at the European Working Group on Gaucher Disease (EWGGD) in Paris in June 2012 titled 'Bone Mineral Density Response to Enzyme Replacement Therapy Over 2 Years in Adults with Type 1 Gaucher Disease'. The Appeal Board noted from the statistical analysis section in the poster that 'As the assessment of BMD using DXA in the study protocols of HGT-GCB-39 and HGT-GCB-44 was pre-specified as exploratory, there were no prespecified hypotheses'.
 
The Appeal Board did not accept Shire's submission that the press release made no comparative claims. The Appeal Board noted that the prominent subheading of the press release read 'In a head-tohead trial between VPRIV and Cerezyme (imiglucerase), only patients treated with VPRIV experienced statistically significant improvement in lumbar spine bone mineral density at 9 months'. In addition, the fourth paragraph of the press release stated 'Results from a head-to-head Phase III Study (HGT-GCB-039) of VPRIV and Cerezyme, and followon extension trial (HGT-GCB-044) of VPRIV, demonstrate a statistically significant improvement in lumbar spine (LS) BMD in Gaucher patients starting at nine months of treatment with VPRIV (p<0.05)'. The Appeal Board considered that, overall, it was not clear that the extension trial (HGT-GCB- 044) had compared BMD results for VPRIV and Cerezyme to baseline and was not a head-to-head, between group comparison of VPRIV and Cerezyme. The Appeal Board considered that this was misleading and it upheld the Panel's ruling of a breach of the Code. Shire's appeal on this point was unsuccessful.
 
The Appeal Board considered that the press release, in particular the bold title and prominent subheading, implied that confirmatory results had been presented. Only once in paragraph five towards the end of the press release did it state that 'BMD, evaluated as an exploratory endpoint in the Phase III and extension studies, …' and this was insufficient to negate the overall impression that confirmatory clinical conclusions could be drawn. The press release was not sufficiently clear. The Appeal Board considered that the press release was thus misleading and upheld the Panel's ruling of a breach of the Code. Shire's appeal on this point was unsuccessful.
 
The Appeal Board noted from the poster that because there were no specific bone-related inclusion or exclusion criteria in the protocols for the studies and the randomization was not stratified by BMD, there were imbalances between the two treatment arms at baseline. The mean lumbar spine BMD Z-score in the VPRIV group was -1.56 and -0.47 in the Cerezyme group (the press release presented median values of -1.46 and -0.86, respectively). In the group of patients who did not receive bisphosphonates 2/11 had normal bone in the lumbar spine in the VPRIV group compared with 4/8 in the Cerezyme group. The Appeal Board noted that the patient numbers had not been included in the press release and considered that it would have been helpful if they had been, especially given the small number of patients in the studies (VPRIV n=13, Cerezyme n=11 and after adjustments to exclude patients with a baseline lumbar spine Z score of <-1, VPRIV n=8 and Cerezyme n=4). The Appeal Board noted Shire's acknowledgment at the appeal that the observed effects might be caused by type II statistical errors. The Appeal Board considered that overall the press release had not provided sufficient information for the reader to assess what weight to attach to the findings. The press release was misleading in that regard. The Appeal Board upheld the Panel's ruling of a breach of the Code. Shire's appeal on this point was unsuccessful.
 
Genzyme strongly disagreed with Shire's view that the press release contained no comparisons.
 
Specifically, it included a sub-headline which stated that, 'In a head-to-head trial between VPRIV and Cerezyme (imiglucerase), only patients treated with VPRIV experienced statistically significant improvement in lumbar spine bone mineral density at 9 months' (emphasis added). Paragraph 5 described how the clinical study showed 'clinically and statistically significant improvement from baseline in mean [lumbar spine] Z-score … at nine months of treatment with VPRIV, but not in the cohort of patients treated with Cerezyme' (emphasis added). Moreover, paragraph 5 also presented, in direct proximity, data from patients treated with VPRIV and patients treated with Cerezyme. It was indisputable that the totality of these claims conveyed the message that based on the data, VPRIV offered a clinical advantage over Cerezyme.
 
Genzyme alleged that the comparisons were misleading. Since the BMD analysis was exploratory, Shire's studies were not designed to be sufficiently powered for this analysis. In addition,even assuming that the original study was sufficiently powered for this exploratory endpoint, the BMD analysis was based on a subgroup of a subgroup. Consequently, this retrospective BMD subgroup analysis was insufficiently powered to draw statistically significant conclusions.
 
Genzyme repeated its previous comments with regard to the differences in baseline BMD for the Cerezyme and VPRIV groups.
 
In addition, Genzyme alleged that the main data, the difference in mean changes from baseline in lumbar spine BMD Z-score of the two treatment groups was neither statistically valid nor reliable. The 95% confidence intervals covered a wide range of possible mean changes in BMD ie individual responses to the two medicines varied widely, and the distribution of these responses overlapped. Given that the confidence intervals for the VPRIV and Cerezyme patient groups contained a significant amount of overlap, it was likely that there was no statistical difference between the two groups. Thus it could not be concluded that the mean changes in BMD were different, as opposed to being a result of mere chance. In other words, given that there was no significant difference between the groups for the outcomes measured, no conclusion regarding comparative effectiveness or superiority could be drawn.
 
Genzyme alleged the press release was unbalanced to selectively present lumbar spine Z-scores. In addition, conclusions of product superiority based on exploratory endpoints must be adjusted for multiple endpoints in order to obtain a valid statistical significance. Even though the superiority claims made by the press release were based on multiple endpoints as well as an exploratory endpoint, the press release failed to disclose that this statistical adjustment was not made. Correcting for these multiple endpoints, a proper statistical analysis would not show improvement in VPRIV.
 
Genzyme alleged that, for the reasons above, the press release misleadingly suggested that this was a like-for-like comparison based on a prospectively designed study devised to evaluate BMD as a primary endpoint in breach of the Code.
 
The Panel considered that Shire's assertions that the press release contained no direct comparisons between VPRIV and Cerezyme and that no confirmatory claims were stated or implied were disingenuous. It noted its comments above in this regard. The original study from which baseline measurements of BMD were taken was a head-tohead non-inferiority study of VPRIV and Cerezyme in type 1 Gaucher disease, the primary endpoints of which were unrelated to BMD. The subheading of the press release stated that in a head-to-head trial between VPRIV and Cerezyme, only those treated with VPRIV experienced a statistically significant improvement in lumbar spine BMD at 9 months. The press release went on to state that a statistically significant improvement from baseline in mean lumbar Z-score was seen at 9 months of treatment with VPRIV, but not in the cohort of patients treated with Cerezyme.
 
The Panel noted each party's submission about baseline BMD measurements and sample size. It noted its general comment about the press release above. Given the exploratory nature of the BMD analysis it was self evident that the studies were not powered to provide confirmatory findings on BMD. The press release gave a contrary impression. Ultimately the allegations on this point were inextricably linked to the point above and the Panel considered that its ruling of a breach of the code applied equally here. This ruling was upheld by the Appeal Board following an appeal by Shire.
 
Genzyme alleged that to argue that the press release contained no comparative/superiority claim simply ignored the plain language of the document. Moreover, as described in detail above, this comparison was unbalanced, unfair, not based on an up-to-date evaluation of all the evidence and based upon unsound statistics. All these elements underscored the misleading nature of the comparative/superiority claims in the press release in breach of the Code.
 
The Panel noted its comments and rulings above about comparisons in the press release between VPRIV and Cerezyme in relation to BMD results. The Panel considered that the press release implied that the studies cited had produced robust confirmatory comparative data that VPRIV significantly improved lumbar spine BMD and that Cerezyme did not. This was not so. The data was such that no conclusive comparisons could be made. The comparison was misleading and a breach of the Code was ruled. This ruling was appealed by Shire.
 
The Appeal Board noted its comments and rulings above. The Appeal Board considered the press release, in particular the title and subheading, compared VPRIV with Cerezyme and implied that there was confirmatory evidence that VPRIV significantly improved lumbar spine BMD and that Cerezyme did not. The evidence, however, was insufficient to make such a comparison and the press release was misleading in this regard. The Appeal Board upheld the Panel's ruling of a breach of the Code. Shire's appeal on this point was unsuccessful.
 
Genzyme alleged that the press release was promotional and was intended for dissemination to patients and to the public in breach of the Code. The press release advertised a prescription only medicine to the public in breach of the Code.
 
The Panel considered that it was not unacceptable to make available information about prescription only medicines to patient organisations but its content and provision had to comply with the Code.
 
The Panel noted that Genzyme's allegation that the press release was promotional appeared to be based on the fact that a press release which contained information about a prescription only medicine was distributed to a patient organisation. On this narrow point, and given its comments above, the Panel did not consider that the press release was promotional and ruled no breach of the Code. This ruling was appealed by Genzyme.
 
The Appeal Board noted its rulings in above where it had ruled that the press release had made misleading claims about VPRIV, and VPRIV vs Cerezyme based on limited exploratory data. The Appeal Board noted that the press release had been widely circulated including to a patient organisation. The Appeal Board noted that the Code prohibited the advertisement of prescription only medicines to the public. The Appeal Board considered that the press release, although not an advertisement per se, did promote VPRIV and thus it ruled a breach of the Code. Genzyme's appeal on this point was successful.
 
The Panel noted that the Code required that information about prescription only medicines which was made available to the public either directly or indirectly must be factual and presented in a balanced way. It must not raise unfounded hopes of successful treatment or be misleading with respect to the safety of the product. Statements must not be made to encourage members of the public to ask their health professional to prescribe a specific prescription only medicine.
 
The Panel noted its rulings above in relation to the misleading statements made about VPRIV in relation to BMD and considered that the press release had not presented information about VPRIV in a balanced way. The press release was likely to encourage members of the public to ask their health professional to prescribe a specific prescription only medicine. A breach of the Code was ruled. This ruling was upheld by the Appeal Board following an appeal by Shire.
 
Genzyme alleged that the press release disparaged Cerezyme as it contained a comparative/superiority claim that was not included in the underlying poster. Moreover, the scientific analysis upon which the claim was based was flawed as detailed above.
 
Whilst the Panel noted its ruling above in relation to the misleading comparisons between VPRIV and Cerezyme, on balance the Panel did not consider that such comparisons amounted to disparagement as alleged. The claims, although ruled above to be misleading, were so in relation to positive comments about VPRIV. There was no implication that Cerezyme was not effective in increasing BMD in Gaucher disease. No breach of the Code was ruled. This ruling was appealed by Genzyme.
 
The Appeal Board noted its rulings above. The press release made comparative claims that VPRIV had an advantage over Cerezyme in lumbar spine Z score based on exploratory data and in relation to comparing each patient group with its baseline rather than comparing between groups. To claim that VPRIV significantly improved lumbar spine BMD and Cerezyme did not, based on exploratory data, was misleading and inaccurate. The Appeal Board considered that, on balance, by making claims that were ruled to be misleading and inaccurate, Cerezyme had been disparaged and thus it ruled a breach of the Code. Genzyme's appeal on this point was successful.
 
Genzyme considered that the press release was promotional and failure to certify it was in breach of the Code.
 
The Panel noted that the Code required certain nonpromotional material be certified. The material listed did not mention press releases; however, it did include 'material relating to working with patient organisations'. The Panel considered that this clause thus required that material sent proactively by a company to a patient organisation, including, inter alia, press releases, should be certified. The Panel considered that the provision of the press release to the patient organisation triggered the certification requirements and ruled breaches of the Code. These rulings were appealed by Shire.
 
The Appeal Board noted its rulings above. The Appeal Board noted that press releases should not promote medicines. However as a consequence of its ruling the press release needed to be certified irrespective of whether it was provided to a patient organisation. The Appeal Board upheld the Panel's rulings of breaches of the Code. Shire's appeal on this point was unsuccessful.
 
Genzyme alleged that as the press release was promotional it needed prescribing information.
 
The Panel noted its ruling above that the press release was not promotional and considered that thus it did not require prescribing information. No breach of the Code was ruled. This ruling was appealed by Genzyme.
 
The Appeal Board noted its ruling above. The Appeal Board considered that the inclusion of prescribing information would not make the item at issue acceptable. Press releases should not promote medicines. However, as consequence of its ruling above, the item was promotional and thus the Appeal Board ruled a breach of the Code. The appeal on this point was successful.
 
Genzyme alleged that Shire's numerous breaches of the Code were so serious as to bring discredit upon, and reduce confidence in, the pharmaceutical industry.
 
The Panel had concerns about the content of the press release. It was not a fair reflection of the study. The Panel noted that Clause 2 was a sign of particular censure and reserved for such use. The Panel considered that when assessing the acceptability or otherwise of claims in a press release companies should be mindful of the intended audience. Companies should be cautious when material was aimed at the consumer press or provided to a patient organisation. The Panel noted its comments and rulings about the press release above. The Panel considered that the implication that exploratory findings were of statistical and clinical significance in a press release directed at, inter alia, a patient organisation was wholly unacceptable and brought discredit upon and reduced confidence in the pharmaceutical industry. A breach of Clause 2 was ruled. This ruling was appealed by Shire.
 
The Appeal Board considered that Shire should have taken much greater care to ensure that the press release accurately reflected the study and its results. There had not been a new medicine in this disease area for a number of years and understandably there would be much interest from patients and their families. To present exploratory endpoints in such a way as to imply statistical and clinical significance was unacceptable. The Appeal Board noted its rulings of breaches of the Code. The Appeal Board considered the content of the press release and its subsequent proactive provision to a patient organisation was wholly unacceptable and brought discredit upon, and reduced confidence in the pharmaceutical industry. The Appeal Board upheld the Panel's ruling of a breach of Clause 2. The appeal on this point was unsuccessful.
 
Genzyme alleged that Shire had failed to comply with all applicable provisions of the Code.
 
The Panel considered that Shire had failed to comply with all applicable codes as required and a breach was ruled. This ruling was upheld by the Appeal Board on appeal by Shire.