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Inhalation studies of molybdenum trioxide (MoO3) were conducted because of its wide use in industry, human exposure, and lack of data on carcinogenicity. Groups of 50 male and 50 female F344/N rats and B6C3F1 mice were exposed to MoO3 by inhalation at 0, 10, 30, or 100 mg/m3, 6 h/day, 5 days/week, for 2 years. In both rats and mice, survival and mean body weights of exposed groups of males and females were similar to those of their respective controls. There were significant exposure-dependent increases in blood molybdenum concentration in exposed rats and mice. There were no toxicological differences in bone density or curvature between exposed animals and their respective controls. In rats, dose-dependent increases in incidence of hyaline degeneration in the nasal olfactory epithelium and squamous metaplasia of the epithelium lining the base of the epiglottis were observed. The incidence of alveolar/bronchiolar adenoma or carcinoma (combined) was marginally increased in males but not in females compared with controls. In mice, the incidences of squamous metaplasia of the epithelium lining the base of the epiglottis, hyperplasia of the laryngeal epithelium, and metaplasia of the alveolar epithelium were significantly increased in all exposed males and females compared with controls. The incidence of alveolar/bronchiolar adenoma or carcinoma (combined) in exposed groups of males and females was significantly greater than that in the control groups.

Lung Tumor Induction by Inhalation Exposure to Molybdenum Trioxide in Rats and Mice