Large granular lymphocyte leukemia in Chernobyl clean-up workers

102 Chernobyl clean-up workers (1986-1987) with suspected hematooncological diseases were examined for precise diagnosis of leukemias and lymphomas. M DS and different types of hematopoietic malignancies have been diagnosed in 57 patients. 3 cases of unusual chronic lymphoproliferative disorder-large granular lymphocyte leukemia (LGL-L) have been diagnosed for the first tim e within the group under study. Detailed cytomorphological and immunophenot ypical characteristics of blood and bone marrow cells in LGL-L patients hav e been presented with particular emphasis on the possible relationship betw een chronic lymphoproliferative disorders and exposure to ionizing radiatio n.