<prompt> All of the following are poor prognostic factors in a case of acute myeloid leukemias, except:Age more than 60 yearsPresence of t8:21Secondary leukemiasLeucocyte count more than 1,00,000microl  <response>: Patients t8;21 and inv16 has a good prognosis, approximately 55 of these patients are cured. t15:17 is associated with a very good prognosis, while those without any cytogenetic abnormality have a moderately orable outcome. Ref: Harrisons Internal Medicine, 18th Edition, Chapter 109 