Comments Sought on Pepaxto’s Proposed Withdrawal
CDER is seeking comments on its proposal to withdraw Oncopeptides’ accelerated-approved multiple myeloma drug Pepaxto (melphalan flufenamide). The proposal came after a confirmatory trial (OCEAN) demonstrated a worse overall survival and failed to verify clinical benefit. Pepaxto was originally approved 2/2021, and at FDA’s request, Oncopeptides ceased marketing it 10/2021, the company says.
The withdrawal request also follows a 9/23/2022 Oncologic Drugs Advisory Committee (ODAC) vote of 14 to 2 against whether the benefit-to-risk profile of Pepaxto was favorable in adult patients with relapsed or refractory multiple myeloma. In a briefing document released in advance of the meeting, FDA reviewers said the OCEAN trial did not meet the prespecified primary endpoint — progression-free survival (PFS) superiority of melphalan flufenamide compared to pomalidomide (see story). FDA dismissed revised PFS data the company submitted showing a marginal PFS significance because it considered unconfirmed progression as events in the PFS analysis.