Multiparous female mice of the WapTag1 lineage develop mammary adenocarcinomas with an average latency of 13 months. The histopathological phenotype is heterogeneous; papillary, ductal, tubular, and sometimes solid phenotypes are observed. Those tumors with a papillary morphology closely resemble human papillary carcinomas. Tumors arise adjacent to morphologically normal mammary epithelium or hyperplastic lesions. Mammary carcinomas are extremely rare in virgin female mice. Male mice, and those female mice that do not develop mammary carcinoma develop undifferentiated soft tissue sarcomas. Multiparous females of the WapTag3 lineage (Stock No. <a href="https://www.jax.org/strain/003189"">003189</a>) have hyperplastic mammary glands and occasionally develop mammary adenocarcinomas by 6 months of age. At this age, both males and females of this lineage develop osteosarcomas arising from the os petrosum and renal adenocarcinomas.

These WAPTag 1 mice express a transgene containing the SV40 large T antigen gene driven by the mouse whey acidic protein promoter.

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