[Familial occurrence of malignant hematologic diseases].

The cases of first-degree relatives from five families with hematological malignancies are described in this study. The occurrence of non-Hodgkin's lymphoma (NHL) and B-cell chronic lymphoblastic leukemia (B-CLL) in the first family, NHL and chronic myeloid leukemia (CML) in the second one, two cases of Hodgkin's disease (HD) in the third and the fifth one's NHL and acute myelomonocytic leukemia (AMML) in the fourth one observed. Several factors which are considered to be involved in etiopathogenesis of hematological malignancies (virus infection, immune defects, HL-A antigens, cytogenic features) were discussed.