“…Several investigations addressing this question have reported significant differences in univariate analyses, but when multivariate models have been used, taking into account other factors, such as age, gender, karyotype, white blood cell and platelet counts, Auer rods, bone marrow cellularity, degree of dysplasia, and percentage of myeloblasts, it has become evident that the FAB subtype is not an independent prognostic factor. 7,25,26,28,31,34,[39][40][41] Thus, our finding that morphologic subgroup did not significantly modify the survival curves for the different cytogenetic prognostic groups agrees well with the results of these previous investigations.…”