Kaplan-Meier estimates of progression-free survival by response to induction chemotherapy, and humoral immune response and V/V genotype. Progression-free survival curves were plotted by response to induction chemotherapy (A), or by humoral anti-Id immune responses and/or FcγRIIIa 158 V/V genotype in CR (B), PR (C), and all (D) patients. CR represents patients with complete response or complete response unconfirmed. PR represents patients with partial response. Other represents patients without either anti-Id antibodies or FcγRIIIa 158 V/V genotype. TTP indicates median time to progression.