Cytogenetic studies using conventional G‐banding were performed on BM samples. At least 20 metaphases were analyzed whenever possible. Karyotypes were recorded according to the International System for Human Cytogenetic Nomenclature (ISCN) 2013.18 Interphase fluorescence in situ hybridization (FISH) analysis was performed on mononuclear cells of BM aspirates to detect frequent abnormalities such as 5/5q‐, −7, −7q‐, +8, −20/20q‐, and +1/1q + using Vysis LSI EGR1 (5q31), D7S522 (7q31), CEP8, Trisomy 1q (1q25), and D20S108 (20q12) probes (Abott Downers).