Leukaemia and lymphoma risks derived from solvents.

Results of epidemiologic studies indicating an association between solvent exposure and the development of malignancies affecting haematopoietic and lymphatic tissues are reviewed. Clinical and cytogenetic data supporting this association are discussed. A variety of malignant disorders have been associated with solvent exposure, i.e. acute leukaemia, Hodgkin's disease (odds ratio 2.8-6.6), non-Hodgkin's lymphoma (odds ratio 3.3) and myeloma, and there are some indications that solvent exposure may be a risk factor for myelofibrosis. The carcinogenic effect of benzene is epidemiologically and experimentally well documented and there are some indications that other solvents may also be hazardous. Possible mechanisms bringing about malignant transformation are discussed. The need for further epidemiologic, cytogenetic and clinical studies on the association between solvent exposure and malignant diseases is emphasised.