FDA Issues Complete Response Letter for Myeloma Drug

The US Food and Drug Administration (FDA) has declined to approve linvoseltamab (Regeneron), a bispecific antibody being evaluated to treat relapsed/refractory multiple myeloma after progression on at least three previous therapies.

Tuesday evening, Regeneron announced that it had received a complete response letter from the FDA regarding its Biologics License Application for linvoseltamab, citing issues at a third-party manufacturer.

More specifically, Regeneron said in a company press release that the FDA issued the complete response letter based on findings from “a preapproval inspection at a third-party fill/finish manufacturer for another company’s product candidate.”

The third-party manufacturer told Regeneron it believes that the issues have been resolved, Regeneron said, and that facility is now awaiting a follow-up FDA inspection in the “coming months.”

Regeneron noted that this “anticipated outcome” from the FDA preapproval inspection had been disclosed previously during a company earnings call on August 1.

On that call, Regeneron had discussed the FDA’s concerns about the third-party manufacturer and anticipated that “any potential FDA approval for linvoseltamab is likely to be delayed beyond the August 22 PDUFA date.”

Regeneron had initially filed a Biologics License Application for its bispecific antibody in 2src23, based on findings from the phase 1/2 single arm LINKER-MM1 trial. 

In the latest published trial findings, investigators reported that, at a median follow-up of about 14 months, 71% of the 117 patients receiving 2srcsrc mg of linvoseltamab achieved an overall response, with 5src% achieving a complete response. The probability of survival at 12 months was 75.3%.

This would have been the first approval for linvoseltamab, which would have joined two agents already on the US market for relapsed/refractory multiple myeloma: teclistamab (Tecvayli, Janssen) and elranatamab (Elrexfio, Pfizer).

Pricing information for linvoseltamab is not yet available, but its competitors teclistamab and elranatamab are reported to cost around $4src,srcsrcsrc per month.