Vactosertib in Combination w/ Pomalidomide in Relapsed or Relapsed and Refractory Multiple Myeloma

Vactosertib is an inhibitor of protein serine/threonine kinase activity of TGF-β receptor type 1 (TGFBR1; ALK5). Vactosertib inhibits the phosphorylation of the ALK5 substrates, Smad2 and Smad3, and the intracellular signaling of TGF-β. Dosing begins at 60mg by mouth, daily and may increase to 240mg by mouth daily in the absence of dose limiting toxicities

POM, an analog of thalidomide, is an immunomodulatory agent with antineoplastic activity. Myeloma tumor cells exposed to POM, undergo growth arrest and increased apoptotic cell death. POM enhances T cell- and natural killer cell-mediated immunity and inhibit production of pro-inflammatory cytokines by monocytes. POM may be taken orally with water. Capsules should not be broken, chewed or opened. POM should be taken without food (at least 2 hours before or 2 hours after a meal). POM will be commercially available. POM will be taken by mouth at a dose of 4mg per day