Spontaneous Neoplastic Lesions in the Crl:CD-1 BR Mouse

These mouse data were obtained from clients who routinely use mice from Charles River Laboratories in product safety evaluation.

Only control groups are presented here. These data were taken from studies run in thirteen different labs, including six contract toxicology labs and seven industrial labs. Starting dates ranged from November, 1981 to March, 1991, but most were begun in the late 1980s. This publication complements an earlier reference paper published by Charles River in February, 1987 with the same title. The study groups presented in the current publication are different from those in the previous publication.