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Abstract: Within the past 10–15 years, major advances in therapy have strongly improved prognosis of patients with chronic myelocytic leukaemia (CML). We estimated trends in 5- and 10-year relative survival of patients developing CML after a previous malignancy in the United States from 1990–1994 to 2000–2004. Period analysis was employed to disclose recent developments with minimum delay. Overall, 5- and 10-year relative survival increased from 17.6% to 37.7% (p <0.0001) and from 7.6% to 23.8% (p <0.0001), respectively. Improvements were particularly strong in younger age groups. Prognosis of CML patients with previous malignancy no longer lags behind prognosis of patients with primary CML. [Copyright &y& Elsevier]