FDA advisers on Thursday voted against GSK's blood cancer drug Blenrep, finding that its risks outweighed its benefits at the selected dose

(Reuters) -GSK shares fell more than 6% on Friday to the bottom of Britain's blue-chip index after a U.S. FDA advisory panel recommended against approving its blood cancer drug Blenrep, citing earlier concerns over side effects.

Oncologic Drugs Advisory Committee (ODAC) voted against the overall benefit/risk profile at the proposed dosage of GSK plc’s (NYSE:GSK) Blenrep (belantamab mafodotin-blmf) combinations. The belantamab mafodotin combinations were evaluated in adults with relapsed or refractory multiple myeloma who have received at least one prior line of therapy.