Abstract
In 1970 and F344 rat, along with the B6C3F{sub 1} mouse, were selected as the standard rodents for the National Cancer Institute Carcinogenic Bioassay program for studies of potentially carcinogenic chemicals. The F344 rat has also been used in a variety of other carcinogenesis studies, including numerous studies at ITRI. A major concern to be considered in evaluating carcinogenic bioassay studies using the F344 rat is the relatively high background incidence of mononuclear cell leukemia (MCL) (also referred to as large granular lymphocytic leukemia, Fischer rat leukemia, or monocytic leukemia). Incidences of MCL ranging from 10 to 72% in male F344 rats to 6 to 31% in female F344 rats have been reported. Gaining the understanding of the mechanisms involved in the negative correlations noted should enhance our understanding of the mechanisms involved in the development of lung cancer.
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