Study to Determine the Maximum Tolerated Dose for the Combination of Pomalidomide, Bortezomib and Low-Dose Dexamethasone in Subjects With Relapsed or Refractory Multiple Myeloma

Pomalidomide 1, 2, 3, or 4 mg will be taken orally on Days 1-14 of a 21-day cycle

Bortezomib 1 or 1.3 mg/m2 will be administered intravenously or subcutaneously on Days 1, 4, 8 and 11 of 21 days for cycles 1 -8 and on days 1, 8 of 21 days for cycle 9 and onward until disease progression

Dexamethasone 20 mg/day \[≤ 75 years old\] or 10 mg/day \[\> 75 years old\] will be taken orally on days 1, 2, 4, 5, 8, 9, 11, 12 of 21 days for cycles 1-8 and on days 1, 2, 8, 9 of 21 days for cycles 9 and onward until disease progression