Morphologic Changes in the Bone Marrow in Patients of Chronic Myeloid Leukemia (CML) Treated with ImatinibMesylate.

Imatinib mesylate (Gleevec) is an effective treatment for chronic myeloid leukemia (CML). Though cytogenetic and molecular analyses are essential disease monitoring parameters in CML bone marrow morphological response is not well defined. We examined marrow samples from 40 patients with CML which have at least 2 or more follow-up marrow. A significant positive correlation with complete cytogenetic response shown for normalization of cellularity (P = 0.0097), absence of dry tap (P = 0.0368) and abnormal megakaryocytes (P = 0.005), reduction of blasts (P = 0.019), basophils (P = 0.031), M:E index (P = 0.018) and fibrosis (P = 0.018). Morphological criteria for complete cytogenetic response in CML patients treated with Imatinib can be defined.Morphologic response is also of potential clinical value in addition to cytogenetic and molecular response in patients of CML treated with Imatinib.