AUTH/3010/1/18 - Bristol-Myers Squibb and Pfizer v Daiichi-Sankyo

Promotion of Lixiana

  • Received
    12 January 2018
  • Case number
    AUTH/3010/1/18
  • Applicable Code year
    2016
  • Completed
    17 October 2018
  • No breach Clause(s)
  • Breach Clause(s)
  • Sanctions applied
    Undertaking received
  • Additional sanctions
  • Appeal
    Appeal by respondent
  • Review
    Published in the May 2019 Review

Case Summary

Bristol-Myers Squibb Pharmaceuticals and Pfizer (The Alliance) made a joint complaint about the promotion of Lixiana (edoxaban) by Daiichi-Sankyo. Lixiana was a direct oral anticoagulant (DOAC) of which there were currently four marketed in the UK: edoxaban, rivaroxaban, dabigatran and apixaban. Apixaban (Eliquis) was marketed by the Alliance.

The detailed response from Daiichi-Sankyo is given below.

The Alliance alleged that Daiichi-Sankyo had failed to include important information from the Lixiana summary of product characteristics (SPC) in promotional material. Section 4.4 (Special warnings and precautions for use) included:

‘Renal function in [nonvalvular atrial fibrillation] NVAF

A trend towards decreasing efficacy with increasing creatinine clearance was observed for edoxaban compared to well-managed warfarin (see section 5.1). Therefore, edoxaban should only be used in patients with NVAF and high creatinine clearance after a careful evaluation of the individual thromboembolic and bleeding risk.’

The Alliance further noted that this precautionary wording was unique to Lixiana. Despite the fact that none of the other three DOACs had such wording in their SPCs, there was a consistent, even ubiquitous, omission of any mention of the precautionary wording in any Lixiana promotional material. The Alliance alleged that this misled as to the type and number of patients who might be eligible for Lixiana and misrepresented its risk benefit profile for a significant number of patients who might have a high creatinine clearance.

The Alliance alleged the misleading omission of this precautionary wording in all Lixiana materials but it was particularly notable in two items. The first, a Lixiana ‘Initiation Information Guide’ stated: ‘This booklet contains important summary information designed to help prescribers initiate Lixiana appropriately’, specific sections on indications and recommended dose, switching, contraindications, cautions, pregnancy and breastfeeding, hepatic impairment, renal impairment, monitoring, prescribing and dispensing information, storage, missed dose, patient alert card, further information, interactions summary and side-effects. Despite the extremely detailed content there was no mention in any of these sections of the precautionary wording from the SPC about patients with high creatinine clearance levels. This omission was particularly misleading as the ‘Cautions’ section referred to patients with end stage renal disease. By including information about patients with low creatinine clearance but not important information about patients with high creatinine clearance gave the misleading impression that there were no important considerations for the latter group of patients. The precaution relating to patients with high creatinine clearance was not a trivial matter. Underdosing of patients with atrial fibrillation with anticoagulants could put them at increased risk of serious outcomes such as stroke or systemic embolism. Such adverse outcomes could be life-changing or even fatal.

Similar allegations were made about the second item at issue, a Lixiana ‘Practical Guide’, was described in the ‘Overview’ section as ‘specifically for prescribers in relation to the use of Lixiana’.

The Alliance refuted Daiichi-Sankyo’s assertion that the precautionary wording at issue was in the prescribing information and thus did not need to be included in the body text of the promotional material itself as the Code required the presentation of an accurate, balanced, complete and fair reflection of all the evidence in order to enable the recipient to form their own opinion of the therapeutic value of the medicine. This was particularly the case where matters of patient safety were concerned. When health professionals were encouraged to initiate a particular medicine, or switch patients from one medicine to another, they needed clear information about those patients who might not be suitable for the new medicine. Thus, promotional material which referred to the benefits of a medicine but omitted any warnings, relying instead on the reader referring to the prescribing information, usually placed at a distance at the back of the material, did not present a complete and balanced case regarding a significant proportion of patients. For example, there was a great deal of prominent information on Lixiana, in the ‘Practical Guide’ and ‘Initiation Guide’, discussed above, much of which could also be found in the prescribing information. However, DaiichiSankyo had also chosen to include this information prominently in the body of the promotional material itself, just as it had always omitted from the body text the precautionary wording at issue. In short, the appearance of the precautionary wording in the prescribing information alone was not adequate. Presentation of the information about a medicine in this way was unbalanced, misleading and potentially dangerous.

The Alliance stated that the other principal pillar of Daiichi-Sankyo’s defence of the omission of this important information was to refer to the National Institute for Health and Care Excellence (NICE) technology appraisal of edoxaban TA355 which it selectively quoted as saying ‘there is no reason to make differential recommendations based on creatinine clearance’. However, The Alliance noted that the NICE committee noted the relevant warning at Section 4.4 of the SPC before concluding that if edoxaban was used in accordance with that SPC there was no reason to make differential recommendations based on creatinine clearance.

The Alliance stated that it was therefore clear that the Committee considered that this wording, contained within the SPC, was an adequate warning but that the clinician needed to take this into consideration before deciding to prescribe. It was on this basis that the Committee decided that it did not need to issue any additional differential recommendations. The Alliance agreed with NICE that edoxaban should be used, and therefore promoted, in accordance with its SPC, which would therefore include any appropriate warnings and precautions.

The Alliance stated that whilst not relevant to the regulatory guidance issued about the use of Lixiana in the UK, it was reflective of the clinical importance of this UK SPC warning statement that in the USA the Food and Drug Administration (FDA) included these considerations as a contraindication black box warning in the Lixiana prescribing information. Details were provided.

In summary, the Alliance stated that the considered and ubiquitous omission from all promotional material of a prominent precautionary statement, found in the SPC, about the use of Lixiana in patients with high creatinine clearance, potentially placed a significant number of patients at risk of stroke or systemic embolism in breach of the Code.

The Panel noted that Lixiana was indicated for the prevention of stroke and systemic embolism in adult patients with nonvalvular atrial fibrillation (NVAF) with one or more risk factors, such as congestive heart failure, hypertension, age ≥ 75 years, diabetes mellitus, prior stroke or transient ischaemic attack (TIA).

The Panel considered that whether a special warning or precaution needed to be referred to in material depended on a consideration of all of the circumstances including the nature of the warning/ precaution, the therapy area and the content and intended use of the material.

The Panel noted the relevant warning Section 4.4 of the Lixiana SPC.

The Panel further noted that a subgroup analysis based on renal function which used 3 categories of creatinine clearance (CrCl) was discussed in the NICE technology appraisal guidance on edoxaban for preventing stroke and systemic embolism in people with NVAF which stated that the subgroup analysis across three categories (normal renal function, mild renal impairment and moderate renal impairment) ‘suggested that renal function had a significant impact on the efficacy of edoxaban compared to warfarin (p=0.0042)’. The hazard ratios for the primary efficacy endpoint (prevention of stroke or systemic embolic event) were 0.68 (95% CI 0.54-0.85) and 0.86 (95% CI 0.63-1.17) for patients with mild to moderate renal impairment. In contrast the relative risk of stroke or systemic embolic event was higher with edoxaban than with warfarin in patients with normal renal function (HR 1.31, 95% CI 0.96-1.79). The guidance noted the company’s view that these results should be treated with caution because a variety of factors including an unusually low event rate in the warfarin group and the lack of randomisation within the sub-groups could have contributed towards the result. The NICE guidance (Section 4.6) noted evidence that the trend towards decreasing efficacy of edoxaban with increasing creatinine clearance was likely to be because with better renal function edoxaban was removed by the kidneys more quickly leading to a reduction in treatment effect. Evidence was also submitted that this might apply to all newer anticoagulants but data needed to be re-evaluated to confirm this. Evidence was provided to NICE that the proportion of people with good renal function measured by creatinine clearance who would be eligible for treatment with edoxaban was in the region of 5-10% and that these were often younger people. The NICE committee noted the relevant warning at Section 4.4 of the SPC before concluding that if edoxaban was used in accordance with that SPC there was no reason to make differential recommendations based on creatinine clearance. The Panel noted that the relevant clinical data was also discussed at Section 5.1 Pharmacodynamic properties, of the Lixiana SPC which showed event rate data for 6 creatinine clearance sub-groups. The Panel noted that the Lixiana SPC stated in a Section 4.2 under the sub-heading Special populations, assessment of renal function, that renal function should be assessed in all patients by calculating creatinine clearance prior to initiation of treatment with Lixiana, inter alia, when deciding on the use of Lixiana in patients with increased creatinine clearance.

The Panel noted that a section on page 2 of the six page Lixiana Initiation Information Guide headed ‘CAUTIONS’ stated that the use of Lixiana was not recommended in patients with end stage renal disease (ESRD) (CrCl <15ml/min or on dialysis). On the following page in a section headed renal impairment it stated that in patients with mild renal impairment the recommended Lixiana dose was 60mg once daily, in patients with moderate or severe renal impairment the recommended dose was 30mg once daily and repeated that in patients with ESRD or on dialysis Lixiana was not recommended. It further stated in a subsequent section headed ‘Monitoring’ that renal function should be monitored before treatment and when clinically indicated during treatment. There was no reference in the body of the booklet to the SPC warning at issue. The Panel noted DaiichiSankyo’s submission that the warning was not included within the renal impairment section as there was no recommendation for dose alteration in patients with high creatinine clearance. The Panel noted the comments about the nature of the relevant subgroup analysis in the NICE guidance. The Panel noted that based on this data the regulators had decided to include a special warning about decreased efficacy in patients with high creatinine clearance in the SPC. The SPC clearly stated that edoxaban should only be used in those patients after a careful evaluation of the individual thromboembolic and bleeding risk. The Panel considered that the warning in question did more than ‘encourage’ prescribers to undertake a careful evaluation, as stated by Daiichi-Sankyo; the warning stated that edoxaban should only be used after a careful evaluation of the individual’s thromboembolic and bleeding risk (emphasis added), thereby implying in the Panel’s view that such an evaluation was a requirement in this patient population. The Panel noted the stated purpose of the booklet in question to help prescribers initiate Lixiana appropriately and considered that failure to include the special warning was misleading and did not encourage the rational use of the medicine. In the Panel’s view it was not sufficient to rely on the prescribing information at the back of the guide to provide the warning about the use of Lixiana and the trend towards the decreasing efficacy in patients with NVAF and high creatinine clearance. Material had to be capable of standing alone with regard to the requirements of the Code and could not rely on qualification in either prescribing information or a footnote. The Panel noted the Alliance’s submission about the potential lifechanging or even fatal consequences of failing to undertake such an evaluation in the relevant patient population. Breaches of the Code were ruled. The Panel considered that Daiichi-Sankyo had failed to maintain high standards and a breach was ruled. The breaches were upheld upon appeal by DaiichiSankyo.

In making these rulings the Appeal Board noted that the FDA had contraindicated the use of Lixiana in this group of patients and noted Daiichi-Sankyo’s submission that the EMA had assessed the data differently. Nevertheless there was a warning about use in a patient population with normal kidney function which the Appeal Board considered was unusual. Both items at issue referred readers to the SPC for full prescribing information. The Appeal Board considered that prescribers would not necessarily expect patients with high creatinine clearance and thus normal kidney function to be at risk when prescribing a DOAC for NVAF; it was counter intuitive. It was therefore even more important that the SPC warning in question was drawn to their attention, particularly as Lixiana was the only DOAC that had this specific warning. Other warnings from the SPC were included in the main body of the Initiation Information Guide, including in the Appeal Board’s view special warnings and precautions with less strong wording and to omit the warning at issue downplayed its relative importance. The Appeal Board considered that given the nature of the warning it was paramount that it appeared prominently in the body of the item at issue.

The Appeal Board thought it odd that, according to the Daiichi-Sankyo representatives, its field force had been trained on the warning at issue yet the company had omitted the warning from the body of the materials.

In relation to the 19 page Lixiana ‘Practical Guide’, the Panel noted its general comments above about the warning at Section 4.4 of the SPC, Section 4.2 of the SPC, including comments about the relevant data in the NICE guidance and the prescribing information and considered that they applied here. The Panel noted that the Lixiana Practical Guide covered more matters than the Initiation Information Guide considered above and included discussion of efficacy and safety issues including patients at higher risk of bleeding and special patient populations. The Panel considered that failure to include the special warning at issue, particularly considering there was a page dedicated to special patient populations, was misleading and did not encourage the rational use of the medicine. Breaches of the Code were ruled. The Panel considered that Daiichi-Sankyo had failed to maintain high standards and a breach of the Code was ruled. The breaches were upheld upon appeal by Daiichi-Sankyo.

In making these rulings, the Appeal Board considered that its comments above applied equally to this item. The Appeal Board also noted that the Practical Guide covered more matters than the Initiation Information Guide and included discussion of efficacy and safety issues including patients at higher risk of bleeding and special patient populations. There was a page dedicated to special patient populations and the missing information appeared in the Lixiana SPC under the heading special populations.

The Panel noted the comments in the NICE guidance about the size of the patient population with good renal function (measured by creatinine clearance) who would be eligible for treatment with edoxaban was in the region of 5-10%. The Panel further noted the trend towards decreasing efficacy of edoxaban with increasing creatinine clearance and the consequences of such and considered that DaiichiSankyo’s failure to include the warning meant that it had potentially put those patients’ safety at risk. The Panel considered that patient safety was of the utmost importance and Daiichi-Sankyo’s failure in this regard brought discredit upon and reduced confidence in the pharmaceutical industry. A breach of Clause 2 was ruled in relation to each item. This was upheld on appeal by Daiichi-Sankyo.

The Appeal Board noted its comments and rulings of breaches of the Code including a breach of Clause 2. The Appeal Board considered that DaiichiSankyo’s actions had meant that prescribers had been provided with material that failed to highlight an important patient safety consideration and consequently patients might have been put at risk. This was totally unacceptable. The Appeal Board noted that the NHS guidance on the use of DOACs in NVAF provided by the Alliance made no reference to the warning at issue. Consequently, the Appeal Board decided, in accordance with Paragraph 10.6 of the Constitution and Procedure, to require Daiichi-Sankyo to issue a corrective statement to all recipients of the material at issue. In addition, the Appeal Board considered that given the items broad dissemination including that in the Appeal Board’s view it was more likely than not that this material would have been shared by prescribers with colleagues, the Appeal Board considered that the corrective statement should also be sent to relevant UK prescribers. The corrective statement should refer to the case report. Under Paragraph 10.6 details of the proposed content and mode and timing of dissemination of the corrective statement must be provided to the Appeal Board for approval prior to use.

In addition, the Appeal Board decided, in accordance with Paragraph 10.3, to require Daiichi-Sankyo to take steps to recover the material from those who had received it; written details of the action taken must be provided to the Appeal Board. This should be included in the corrective statement. [The corrective statement, which was agreed by the Appeal Board prior to use, appears at the end of this report.]