Cumulative probability of achieving a CCgR as determined by the EUTOS risk score (all computations in the presence of competing risks). (A) Learning sample (Gray test P < .0001). (B) Validation sample (Gray test P < .0001). (C) All 1873 patients with a known CCgR status and information on spleen size and basophils (Gray test P < .0001). (D) Patients treated with 400 mg of imatinib (Gray test P = .008).