Prognostic value related to the quality of any cytogenetic response obtained within the first 24 months after randomization for both treatment groups. The numbers of patients from whom data were available are given. Survival is calculated after a landmark analysis of 24 months. Note that the axis starts at 2 years after randomization. Curves are based on the intention to treat, regardless of any protocol violation or cause of death. Data on those patients that underwent BMT during chronic phase were censored as of the date of transplantation. The numbers of cytogenetic responders in this figure relate to the response obtained only during the first 2 years, and they therefore differ from the numbers given in Table 3, in which all responders obtained at any time on protocol have been shown.