Safety and Efficacy Study of GCS-100LE in the Treatment of Multiple Myeloma

GCS-100 160mg/m2 IV (in the vein) on Study Days 1, 4, 8 and 11 for up to 12 consecutive 21-day treatment cycles. Three patients will be assigned to each cohort until maximum tolerated dose is reached. The dose levels: 1) 160 mg/m2; 2) 210 mg/m2; 3) 280 mg/m2; 4) 370 mg/m2

Bortezomid 1.3 mg/m2 and dexamethasone 20 mg/day plus an additional 20 mg of dexamethasone on the day following each of the GCS-100/bortezomib and dexamethasone dosing. GCS-100/bortezomib and dexamethasone dosed on Study Days 1, 4, 8 and 11 of each 21-day cycle after disease progression is noted.