OUTLINE: This is a phase I, multicenter, open-label, non-randomized, dose-escalation study of vatalanib followed by a phase II, randomized, controlled study. Patients enrolled in the phase II portion of the study are stratified according to participating center, age (< 50 years vs ≥ 50 years), corticosteroid intake (yes vs no), and mini-mental status evaluation score (< 27 vs 27-29 vs 30).