This is a Phase I, open-label, multicenter, dose-escalation study designed to assess the safety and tolerability of Genz-644282, administered as an IV infusion, to patients with advanced malignant solid tumors. Drug will be administered as a 60-minute IV infusion on days 1, 8, and 15 of the 28 day treatment cycle, or on days 1 and 8 of the 21 day treatment cycle.