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1 Hematology Laboratory, I & III Medical Services (Tufts), Boston City Hospital.
1. Evidence of a marked difference in alkaline phosphatase activity in the
leukocytes of normal subjects and individuals with chronic myelogenous leukemia has been provided by observations on the behavior of the enzyme following prolonged incubation and during pyogenic infection. 2. Therapy with radiation and radiomimetic drugs in chronic myelogenous
leukemia and myeloid metaplasia resulted in a marked fall in leukocyte count
but no change was observed in the relative population of alkaline phosphatase
positive and negative cells. 3. In our laboratory histochemical and biochemical values for leukocyte alkaline phosphatase have been similar to those reported in the literature for typical
cases of chronic myelogenous leukemia and most leukemoid reactions. However,
in certain cases parodoxical findings have been noted in which histochemical and
biochemical studies were inconsistent with the pathologic diagnosis. 4. The inadequacies of purely morphologic criteria in these atypical cases were
noted and the desirability of the further development of cytochemical methods
has been pointed out.
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