Plasma M-CSF as an indicator of response to chemotherapy in adult T cell leukemia patients.

The plasma concentration of macrophage colony-stimulating factor (M-CSF) was measured in 10 patients with acute type adult T cell leukemia (ATL) during the clinical course before and after chemotherapy. M-CSF concentration decreased significantly when the patients achieved complete remission (CR) or partial remission (PR) (t-test: p = 0.0001). Five of the patients showed disease progression after several months of PR, and plasma M-CSF increased at that time (t-test: p = 0.0456). Thus, plasma M-CSF concentration appeared to accurately reflect the disease activity in ATL. In support of these results, all three ATL cell lines established from these patients secreted M-CSF in vitro after stimulation with phorbol myristate acetate (PMA) or concanavalin A (Con A). Plasma M-CSF concentration, however, increased transiently when the patients were febrile (t-test: p = 0.0001), even though their ATL condition was unchanged. Taken together, these results indicate that there are two sources of increased plasma M-CSF concentration in ATL; ATL cells themselves and normal parenchymal cells that cause this increase as the result of elevated body temperature due to inflammation.

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