Photo courtesy of Amgen
Health Canada has approved the proteasome inhibitor carfilzomib (Kyprolis) for use in combination with lenalidomide and dexamethasone to treat patients with relapsed multiple myeloma (MM) who have received 1 to 3 prior lines of therapy.
Carfilzomib, a product of Amgen Canada, is also approved for use in the US, the European Union, Argentina, Israel, Kuwait, Mexico, Thailand, and Colombia.
Health Canada’s approval is based on results of the phase 3 ASPIRE trial, which were presented at ASH 2014 and published in NEJM.
The trial enrolled 792 patients with relapsed or refractory MM who had received 1 to 3 prior lines of therapy. The patients were randomized (1:1) to receive carfilzomib plus lenalidomide and dexamethasone (KRd) or just lenalidomide and dexamethasone (Rd) for 18 cycles.
Lenalidomide and dexamethasone were continued thereafter until disease progression. There was no planned cross-over from the control arm to treatment with carfilzomib.
The study’s primary endpoint was progression-free survival. The median progression-free survival was significantly longer in the KRd arm than the Rd arm—26.3 months and 17.6 months, respectively (hazard ratio=0.69, P=0.0001).
At the time of analysis, the difference in overall survival did not reach the prespecified boundary for statistical significance.
The overall response rate was 87% in the KRd arm and 67% in the Rd arm. The median duration of response was 28.6 months and 21.2 months, respectively.
The rates of death due to adverse events (AEs) within 30 days of the last dose were similar between the treatment arms.
The most common causes of death not due to progressive disease occurring in patients in the KRd arm and the Rd arm, respectively, were cardiac disorders (3% vs 2%), infection (2% vs 3%), renal events (0% vs less than 1%), and other AEs (2% vs 3%).
Serious AEs were reported in 60% of patients in the KRd arm and 54% in the Rd arm. The most common serious AEs reported in the KRd arm and the Rd arm, respectively, were pneumonia (14% vs 11%), respiratory tract infection (4% vs 2%), pyrexia (4% vs 2%), and pulmonary embolism (3% vs 2%).
