Regeneron Reports Initial Data For Multiple Myeloma Drug

 | Dec 09, 2019 04:31AM ET

Regeneron Pharmaceuticals, Inc. (NASDAQ:REGN) announced initial data for REGN5458, a BCMAxCD3 bispecific antibody, in patients with relapsed or refractory (R/R) multiple myeloma — the second most common blood cancer. Results were presentedat the American Society of Hematology (ASH) Annual Meeting from the first two dose groups (3 mg and 6 mg weekly doses).

Patients had a median of seven lines of prior systemic therapy, and all had failed in the CD38 antibody treatment arm. Responses were observed in 4 of 7 (57%) patients, including 3 of 4 (75%) in the 6 mg dose group. In the 6 mg dose group, 2 patients (50%) were also minimal residual disease (MRD) negative, which means no cancer cells were detectable in their bone marrow.

Two patients achieved the high bar of MRD negativity, and another patient attained a very good partial response despite entering the trial with difficult-to-treat plasmacytomas outside of the bone marrow.

As of data cut-off, there were no neurotoxicity, dose-limiting toxicities or treatment discontinuations due to adverse events.

Shares of Regeneron decreased 0.3% year to date against the industry ’s growth of 6.6%.