All of the following are poor prognostic factors in a case of acute myeloid leukemias, except:

Patients t(8;21) and inv(16) has a good prognosis, approximately 55% of these patients are cured. t(15:17) is associated with a very good prognosis, while those without any cytogenetic abnormality have a moderately orable outcome. Ref: Harrison's Internal Medicine, 18th Edition, Chapter 109