Among 246 patients (49 with Hodgkin's disease, 29 with multiple myeloma, 75 with other lympho- and immunoproliferative syndromes, 70 with carcinomas and 23 with non-malignant affections) treated by cytostatic or immunosuppressive chemotherapy, 6 developed malignant hemopathy (acute myeloblastic leukemia, erythroleukemia and erythremia) apparently induced during the last 7 1/2 years. In addition, 2 carcinomas have been noted. All have received melphalan or chlorambucil, alone or associated with other cytostatic drugs. 5 out of these 6 patients also underwent radiotherapy. The lenght of chemotherapy ranged between 7 and 110 months and the latency between 45 and 110 months. A "preleukemic" cytopenia phase was observed in 4 out of 6 cases. An exceptional 45-month survival was secured in case 1 (acute myeloblastic leukemia in a patient probably cured of Hodgkin's disease IIIB). Observation 2 is the 3rd case ever published of induced acute leukemia in disseminated lupus erythematosus. All these observations are compared with the latest findings in the literature. To the very extent that the utilization of cytostatic drugs produces improvement in the prognosis of very serious diseases, their leukemogenic potential becomes more dangerous and demands limitation of their use.
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