Combination of BCMA-directed T cell therapy and an immunomodulatory compound

Provided herein are methods, compositions and uses for treating subjects with diseases and conditions, such as those involving or associated with B cell maturation antigen (BCMA), involving administration of a T cell therapy, such as a BCMA-targeted T cell therapy, e.g. anti-BCMA CAR T cells, in combination with (S)-3-[4-(4-morpholin-4-ylmethyl- benzyloxy)-1-oxo-1,3-dihydro-isoindol-2-yl] -piperidine-2, 6-dione, or a pharmaceutically acceptable salt, solvate, hydrate, stereoisomer, tautomer or racemic mixtures thereof, and compositions thereof, or in combination with (S)-4-(4-(4-(((2-(2,6-dioxopiperidin-3-yl)-1-oxoisoindolin-4-yl)oxy)methyl)benzyl)piperazin-l-yl)-3-fluorobenzonitrile, or a pharmaceutically acceptable salt, solvate, hydrate, stereoisomer, tautomer or racemic mixtures thereof, and compositions thereof. The T cell therapy includes cells that express recombinant receptors such as chimeric antigen receptors (CARs) directed against BCMA. In some embodiments, the disease or condition is a multiple myeloma, such as relapsed or refractory multiple myeloma.