CYTOGENETICS OF CHRONIC MYELOGENOUS LEUKEMIA (CML) CORRELATED TO THE HISTOPATHOLOGY OF BONE-MARROW BIOPSIES

Cytogenetic findings were correlated to histopathological bone marrow findings evaluated simultaneously in 103 patients with chronic myelogenous leukemia (CML). CML was subtyped histologically according to the number of megakaryocytes and increase of fibers or blasts within the bone marrow. The Philadelphia chromosome (Ph 1) was found in 88.3% of all patients (91/103). Chromosome aberrations additional to the Ph 1-chromosome were noticed in 20 of 91 (22%) cases. The additional karyotype changes occurred significantly more frequently among patients with increase of fibers in the bone marrow compared with patients without increase of fibers or blasts (p < 0.05). Karyotype changes associated with increase of fibers in Ph 1-positive cases of CML were trisomy 8 and 19, +Ph 1, t (1; 11), and i (17q). Ph 1-positive CML patients with additional karyotype changes had a significantly shorter survival (p < 0.04) than Ph 1-positive patients without additional chromosome aberrations. Our results suggest that histopathological examination of the bone marrow should be considered in the evaluation of cytogenetic markers in chronic myeloproliferative disorders.