Overall survival by Euro (Hasford) score with 10-year follow-up from the German CML Study IV. A total of 1551 patients with chronic phase CML were treated with imatinib 400 mg daily or 800 mg daily or with imatinib in combination with cytarabine or with interferon-α or with imatinib after interferon-α. Overall survival is shown by Euro risk score. (A) Low risk. (B) Intermediate risk. (C) High risk. Reprinted from Hehlmann et al² with permission. AraC, cytarabine; IFN, interferon-α; IM, imatinib; OS, overall survival.