Kaplan-Meier analysis of overall survival and survival following initiation of imatinib in all patients according to deletion status. (A) Overall survival is compared between those patients with (n = 54) and those without deletions (n = 297). (B) Comparison of survival between patients with (n = 54) and without (n = 300) deletions, following the initiation of treatment with imatinib. No significant differences were seen as compared by log-rank analysis with the P values as compared by log-rank analysis shown.