Fig. 1. Factors associated with prolonged event-free survival. Significantly prolonged event-free survival (EFS) was associated with the absence of B symptoms (P=0.04), Binet stage A–B (P=0.03), del 17p clone size of <25% (P=0.03), and B2 microglobulin of <4 mg/L (P=0.05). No significant associations were observed for age, CD38+ status, or ZAP70+ status.