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Spontaneous Lesions in Aging FVB/N Mice

Laboratory of Experimental Pathology, Environmental Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709

William Stokes

Office of Alternative Models, Environmental Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709

Peter C. Mann

Experimental Pathology Laboratories, Inc., Research Triangle Park, North Carolina

Masaya Takaoka

Laboratory of Experimental Pathology, Environmental Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709

Robert R. Maronpot

Laboratory of Experimental Pathology, Environmental Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709

The FVB/N mouse strain was created in the early 1970s and has since been used extensively in transgenic research because of its well-defined inbred background, superior reproductive performance, and prominent pronuclei of fertilized zygotes, which facilitate microinjection of DNA. Little is known, however, about the survivability and spontaneous disease of nontransgenic FVB/N mice. Therefore, the purpose of this study was to determine survival to 24 mo of age and the incidence of neoplastic and nonneoplastic disease at 14 and 24 mo of age. At 14 mo of age, the incidence of tumor-bearing mice was 13% in males (n = 45) and 26% in females (n = 98). All tumors in males and most in females at this time were alveolar-bronchiolar (AB) neoplasms of the lung. Survival to 24 mo of age was approximately 60% in both sexes (29/50 males, 71/116 females), and the incidence of mice with tumors at this time was 55% in males and 66% in females. In decreasing order of frequency, the following neoplasms were observed in >5% of subjects: in males, lung AB tumors, liver hepatocellular tumors, subcutis neural crest tumors, and Harderian gland adenomas; in females, lung AB tumors, pituitary gland adenomas, ovarian tumors (combined types), lymphomas, histiocytic sarcomas, Harderian gland adenomas, and pheochromocytomas. Compared with other mouse strains, the observed incidences of tumors in FVB/N mice suggest a higher than usual rate of lung tumors and a lower than usual incidence of liver tumors and lymphomas. This tumor profile should be considered in the interpretation of neoplastic phenotypes in FVB/N-derived transgenic lines.

Key Words: Tumors • mouse • spontaneous • transgenic

Toxicologic Pathology, Vol. 24, No. 6, 710-716 (1996)
DOI: 10.1177/019262339602400606


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