Bristol Myers Squibb Co. disclosed in March 2026 that the phase III portion of the seamless phase II/III Successor-2 study testing mezigdomide in combination with carfilzomib and dexamethasone (MeziKd) in patients with relapsed or refractory multiple myeloma was successful. Nearly three months later, the magnitude of success for its Pomalyst (pomalidomide) successor is clear.