[Role of retroviruses in human cancerogenesis].

Retroviruses are viral agents which are natural and experimental inductors of leukemias and solid tumors among numerous animal species. In man, they are implicated as ethiological agents of a specific type of leukemia, adult-T cell leukemia. Thus is for retrovirus HTLV-I. Another retrovirus, HIV, implicated in AIDS is capable of leading to the formation of several types of opportunistic tumors, such as non Hodgkin lymphomas and Kaposi's sarcoma.