Incidence of Spontaneous Non-Neoplastic Lesions in Transgenic CBYB6F1-Tg(HRAS)2Jic Mice

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Abstract

Since 2003, the Tg.rasH2 model has been accepted by regulatory agencies worldwide for 26-week short-term carcinogenicity assays as an alternative to the standard 2-year assays in conventional mice. However, over the decade, the number of actual studies conducted with alternative mouse models has remained low. The primary cause for low acceptance of this model has been lack of a historical database for the incidence of spontaneous lesions. Recently, we published the historical control database on spontaneous tumors in the Tg.rasH2 mice. The purpose of this publication is to present a large database pertaining to the non-neoplastic spontaneous lesions noted in Tg.rasH2 mice from studies conducted at our facility. Lesions that are considered unique in Tg.rasH2 mice are skeletal muscle myopathy, vascular anomalies involving various organs, and mesenteric arterial thrombosis. Other notable lesions are extramedullary hematopoiesis of spleen, subacute inflammatory foci in the liver, and infiltration of histiocytes in the lungs. © 2013, SAGE Publications. All rights reserved.

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Paranjpe, M. G., Shah, S. A., Denton, M. D., & Elbekai, R. H. (2013). Incidence of Spontaneous Non-Neoplastic Lesions in Transgenic CBYB6F1-Tg(HRAS)2Jic Mice. Toxicologic Pathology, 41(8), 1137–1145. https://doi.org/10.1177/0192623313478207

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