A 54-year-old man diagnosed with chronic lymphocytic leukemia (CLL) was admitted in our department in June 2014. After one cycle of FC chemotherapy, a bone marrow examination revealed normalized lymphocyte count and another acute myeloid leuke-mia (AML)-M5 clone. The patient refused sequential treatment and only received follow-up examination. He had continuous hemato-logically stable disease and died of pulmonary infection on July 2015. After a multidisciplinary team discussion, we confirmed the si-multaneous diagnosis of CLL and AML-M5. Through this discussion,tumor second hit model,tumor evolution model,andtumor heterogeneitywere further defined.
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