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Spontaneous neoplasms in B6C3F1 mice
1Department of Experimental Pathology, American Cyanamid Company, Pearl River, NY 10965.
Toxicology Letters
|January 1, 1992
Summary
This study details spontaneous tumor types in control B6C3F1 mice. Hepatocellular and lymphoreticular neoplasms were most common in males, while females showed higher rates of lymphoreticular neoplasms and pituitary adenomas.
Area of Science:
- Toxicology
- Oncology
- Animal Models
Background:
- Spontaneous neoplasms in control animals are crucial for interpreting carcinogenicity studies.
- Understanding baseline tumor incidence in B6C3F1 mice is essential for accurate risk assessment.
Purpose of the Study:
- To tabulate and analyze the incidence of spontaneous neoplasms in untreated B6C3F1 mice.
- To provide a reference for common tumor types in this strain used in carcinogenicity testing.
Main Methods:
- Evaluation and tabulation of neoplasms in 200 male and 200 female B6C3F1 mice.
- Data collected from control groups across four separate carcinogenicity studies.
Main Results:
- In males, hepatocellular adenomas/carcinomas (24.5%) and alveolar-bronchiolar adenomas/carcinomas (10.0%) were most frequent.
- In females, lymphoreticular neoplasms (22.0%) and pituitary adenomas (15.5%) were most common.
- Tumor incidence in other organs was generally low for both sexes.
Conclusions:
- B6C3F1 mice exhibit distinct spontaneous neoplasm profiles between sexes.
- This data serves as a vital benchmark for carcinogenicity assessments in this mouse model.