Pomalidomide for multiple myeloma previously treated with lenalidomide and bortezomib

Nature of the condition

4.2 Multiple myeloma is a chronic and ultimately fatal condition that seriously affects quality of life, and treatments that improve both survival and quality of life are important to patients. The clinical experts pointed out that multiple myeloma is a heterogeneous disease; when deciding which treatments to use, response to previous treatments and toxicity are important so having a range of treatment options is valuable. The experts highlighted that there is a clear unmet need in the current treatment pathway, because very few options are available after using existing NICE‑recommended treatments (thalidomide, bortezomib and lenalidomide). Moreover, quality of life is an especially important consideration at this stage of the pathway because of the accumulation of toxicities over multiple lines of therapy. The experts highlighted that patients place particular value on therapies that can be taken orally. The committee recognised the need for an effective, well‑tolerated treatment option for people with multiple myeloma at third or subsequent relapse who have had at least 3 previous treatments, including both lenalidomide and bortezomib.

Treatment pathway

4.3 The committee considered the likely position of pomalidomide with dexamethasone in the treatment pathway for relapsed and refractory multiple myeloma, noting that its marketing authorisation specified that it should only be used after at least 2 previous treatment regimens, including both lenalidomide and bortezomib. The committee was aware that NICE currently recommends lenalidomide as third‑line treatment, and it asked the experts if this reflects clinical practice. The clinical experts confirmed that for most patients, lenalidomide is offered at third line, after thalidomide then bortezomib (they clarified that a small proportion of people had received lenalidomide at second line through the Cancer Drugs Fund). The experts agreed that the evidence for pomalidomide with dexamethasone in this indication was largely for patients whose disease was heavily pre‑treated, which was consistent with using it after 3 or more previous therapies. The committee concluded that the appropriate positioning of pomalidomide, in line with clinical practice and the evidence base was after third or subsequent relapse (that is, after 3 previous treatments including both lenalidomide and bortezomib) and that this positioning would be the focus of its considerations.

Comparators

4.4 The committee considered the options available for treating multiple myeloma after third or subsequent relapse. The committee queried whether the comparators included in the scope reflected clinical practice:

4.5 The experts highlighted that in choosing a treatment, healthcare professionals and patients together consider comorbidities, route of administration, and the response to and toxicity of previous treatments. As such, all of the treatments noted above are used in clinical practice and are appropriate comparators. However, the experts reiterated that none of these treatments is used very often because of the current availability of pomalidomide through the Cancer Drugs Fund. The committee understood the concerns around the comparators and that the clinical experts valued pomalidomide because it was a clinically effective, oral, well‑tolerated treatment. The committee concluded that the comparators in the scope were appropriate.

Clinical effectiveness

4.6 The committee considered the comparator in MM‑003, the main phase III, open‑label trial presented by the company. The committee noted that it compared pomalidomide plus low‑dose dexamethasone with high‑dose dexamethasone alone. It heard from the clinical experts that although high‑dose dexamethasone was appropriate when MM‑003 was started, it no longer represents an option for active treatment in England. The committee noted that no direct comparative evidence was available for any of the comparators, and recalled its discussions during the previous appraisal about the challenges in obtaining evidence for pomalidomide compared with current therapies. The company presented a case for the clinical effectiveness of high‑dose dexamethasone to be used as a proxy for the clinical effectiveness of conventional chemotherapy. The experts noted that despite different toxicity levels, conventional chemotherapy and high‑dose dexamethasone have similar delivery mechanisms, and agreed that this was a reasonable assumption. The committee concluded that high‑dose dexamethasone was a reasonable proxy for conventional chemotherapy.

4.7 The committee discussed the clinical‑effectiveness data from MM‑003 and its generalisability to clinical practice in England. The committee heard that patients in the trial were younger than typically seen in clinical practice, but the clinical experts' experience in practice suggests that older patients experience similar outcomes with pomalidomide. Moreover, in a subgroup analysis in MM‑003, pomalidomide worked as well in older patients as it did in the younger age group. The results, based on the assessment of outcomes by the independent response adjudication committee (median follow‑up 10 months), suggested that pomalidomide and low‑dose dexamethasone resulted in a statistically significant median progression‑free survival gain of 1.8 months compared with high‑dose dexamethasone alone (and therefore, by proxy, compared with conventional chemotherapy). The median overall survival gain with pomalidomide and low‑dose dexamethasone was between 4.6 months and 7.0 months depending on whether the results were based on the intention‑to‑treat population or adjusted for crossover (56% of patients crossed over to the pomalidomide arm). The committee concluded that pomalidomide and low‑dose dexamethasone is clinically more effective than high‑dose dexamethasone alone (and, by proxy, conventional chemotherapy).

Cost effectiveness

4.12 The committee considered the cost‑effectiveness evidence submitted by the company, noting that the model structure was in line with that used in the previous appraisal. The committee noted that the comments from the ERG around model structure related mainly to identifying and correcting programming errors. The committee agreed that the model structure was appropriate and concluded that it would consider results based on the ERG's correction of errors in the company's base case.

4.13 The committee noted that the main change for this review was the inclusion of data from the updated indirect comparisons (see sections 4.7 to 4.10). For the comparison with conventional chemotherapy including data from the MM‑030 trial, the company included the data adjusted for crossover using the 2‑stage method, and the ERG agreed that this method was most appropriate. The company also included covariate‑adjusted comparisons within the model for comparisons with bendamustine and panobinostat, conducted using the corrected group prognosis (CGP) method in the base‑case analysis, and the mean of covariates method in a scenario analysis. The ERG included the CGP method in its preferred analysis but did not state that this was a better approach; the committee was aware that it had a small effect on the incremental cost‑effectiveness ratios (ICERs). The ERG's main concern with the company's analyses was that because the company used different datasets for pomalidomide in each comparison, a fully incremental analysis was not possible. The ERG preferred to use the pooled dataset for pomalidomide (based on MM‑030, MM‑002 and MM‑010) for all comparisons because it would include a larger dataset and allow for a full incremental analysis. However, the committee noted that this would mean losing the head‑to‑head trial data compared with conventional chemotherapy, and some of the trial arm comparability for pomalidomide compared with bendamustine. The committee understood the ERG's approach but did not consider that it was more appropriate than the company's approach. The committee concluded that it would base its decisions on the company's base‑case ICERs, corrected by the ERG for errors.

4.14 Compared with conventional chemotherapy, the company's base‑case ICER (corrected by the ERG) for pomalidomide with low‑dose dexamethasone was £48,673 per quality‑adjusted life year (QALY) gained. The committee was aware this was based on data directly from the MM‑003 trial and was therefore less uncertain than the other comparisons. It concluded that this was the most plausible ICER for pomalidomide with low‑dose dexamethasone compared with conventional chemotherapy.

4.15 Compared with bendamustine, the company's base‑case ICER (corrected by the ERG) for pomalidomide with low‑dose dexamethasone was £45,082 per QALY gained. The committee considered that this comparison was likely to be biased in favour of bendamustine, so adjusting for this would lower the ICER. The committee also noted that bendamustine is now available for a lower price (£27 per vial compared with £276 per vial). The ERG stated that accounting for this would increase the ICER. The committee concluded that the ICER for pomalidomide with low‑dose dexamethasone compared with bendamustine was associated with uncertainty, but was likely to be less than £50,000 per QALY gained.

4.16 The precise ICERs for pomalidomide compared with panobinostat cannot be reported because of a confidential patient access scheme for panobinostat. Based on the company's base case (corrected by the ERG), pomalidomide plus low‑dose dexamethasone resulted in cost savings and also a QALY loss, producing ICERs that reflected 'savings per QALY lost'. The committee noted that, in situations in which an ICER is derived from a technology that is less effective and less costly than its comparator, the commonly assumed decision rule of accepting ICERs below a given threshold is reversed. So the higher the ICER, the more cost effective a treatment becomes. The committee recalled the uncertainties underpinning the indirect comparison with panobinostat but was satisfied that the ICER was in the 'southwest' quadrant of the cost‑effectiveness plane. Also noting the toxicity associated with panobinostat, the advantages of oral treatment and therefore the improved quality of life associated with pomalidomide, the committee concluded that an additional treatment option would be of value to patients. It further concluded that pomalidomide plus low‑dose dexamethasone was recommended as a cost‑effective use of NHS resources.

End-of-life considerations

4.17 The committee considered the advice about life‑extending treatments for people with a short life expectancy in NICE's final Cancer Drugs Fund technology appraisal process and methods.

4.18 The company discussed whether life expectancy without pomalidomide would be less than 24 months. The committee noted that median overall survival estimated from the model was 13.10 months for panobinostat, 8.90 months for bendamustine and 6.21 months for conventional chemotherapy. The committee considered that this was also consistent with means below 24 months, and concluded that this criterion was met for all comparisons. It noted, however, that the model was based on trial populations of patients whose disease had been heavily pre‑treated. This end‑of‑life criterion could not, therefore, be assumed to have been met if pomalidomide was positioned any earlier than at third and subsequent relapse in the treatment sequence.

4.19 The committee discussed whether a survival benefit of over 3 months can be expected for pomalidomide compared with the comparators. The committee was aware that pomalidomide was less effective than panobinostat (see section 4.10) and therefore did not meet this criterion. The committee noted that pomalidomide was associated with a median overall survival gain of 13.1 months compared with about 6.0 months for conventional chemotherapy and 9.0 months for bendamustine. The committee noted that results were associated with uncertainty, but was satisfied that a survival gain of 3.0 months was plausible. The committee concluded that this end‑of‑life criterion was met for 2 of the 3 comparisons (that is, compared with bendamustine and conventional chemotherapy).

4.20 Having established that pomalidomide meets the end‑of‑life criteria compared with bendamustine and conventional chemotherapy, the committee recalled that the most plausible ICERs were below £50,000 per QALY gained in both cases. The committee was mindful of the uncertainties underpinning these ICERs, and noted that they were at the upper end of the range normally considered to be cost effective if end‑of‑life criteria were met. However, the committee acknowledged that the ICERs were based on best available evidence. It recalled testimonies from clinical and patient experts about the significant value of pomalidomide at this point in the pathway. The committee noted its conclusion in section 4.15 that the savings per QALY lost for pomalidomide compared with panobinostat were high enough for it to be considered a cost‑effective use of NHS resources without applying the end‑of‑life criteria. The committee concluded that it could recommend pomalidomide with low‑dose dexamethasone for treating relapsed and refractory multiple myeloma at third or subsequent relapse; that is, after 3 previous treatments including lenalidomide and bortezomib, as a cost‑effective use of NHS resources, only when the company provides pomalidomide with the discount agreed in the patient access scheme.

Summary of appraisal committee's key conclusions