[Investigation of protective effect of selenium on genetic materials among workers exposed to arsenic].

An increased chromosomal aberration and micronuclei rate of cultured lymphocytes among smelter workers in Yunnan Tin Corporation has been associated with exposure to arsenic which might be involved in carcinogenesis of lung cancer in this area. Selenium, as an essential trace element for life, antagonizes the toxic effects of arsenic. The low intake of selenium among workers in this area might increase injurious effects of arsenic in the tissues. The preliminary results showed that the chromosomal aberration rate of cultured lymphocytes in smelter workers was lowered about 46.1% after treatment with selenium 150 micrograms/d for 21 days. It will provide clues for further study on the elimination of toxicity of arsenic among workers who are exposed to arsenic by supplementation of selenium.