Study Evaluating Safety, Tolerability and Clinical Activity of GSK2857916 in Combination With Pembrolizumab in Subjects With Relapsed/Refractory Multiple Myeloma (RRMM)

belantamab mafodotin will be available as 20 milligrams per millilitre (mg/mL) solution for IV infusion, supplied as frozen liquid. belantamab mafodotin solution will be diluted in normal 0.9% saline to the appropriate concentration for the dose.

Pembrolizumab will be available as 100 mg/4 mL solution that should be stored under refrigeration at 2-8 degree Celsius. Pembrolizumab injection (solution) will be diluted prior to IV administration in 0.9% sodium chloride injection or 5% dextrose injection.