Flow cytometric analysis of cluster of differentiation (CD) markers of myeloid cells has been used in conjunction with cell morphology to diagnose chronic myelogenous leukemia (CML). In the present study, 16 cases of CML were studied for levels of expression of myeloid markers CD15, CD13, CD33, and CALLA, i.e., CD10 which is also expressed on mature granulocytes. In 11 (68.8%) of 16 cases, a differentiated granulocyte population was detected that showed decreased expression of both CD10 and CD13. CD10 was found to be negative in 1 (6.3%) case and showed decreased expression in 10 (62.5%) of the cases. CD13 showed decreased expression in 11 (68.8%) of the 16 cases. Of the 15 cases analyzed for CD15, 2 (13.3%) were negative and 6 (40%) showed decreased expression. Of the 11 cases which showed simultaneous diminished expression of CD10 and CD13, 8 (72.7%) also showed decreased expression of CD15. Of the antigens studied, CD33 was the only one to be consistently expressed at normal levels, i.e., 13 (81.3%) cases demonstrated normal expression. Therefore, these results point to frequently decreased expression levels of CD10, CD13, and CD15 and rarely decreased expression levels of CD33 in association with CML.
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