From Dogs, Answers About Breast Cancer - NYTimes.com: ".... Because dogs typically have 10 mammary glands and often develop tumors in several glands at the same time, they present a unique research opportunity, enabling scientists to study lesions that are at different stages of development — from benign to cancerous, and at transitional stages — all in the same animal.
“The dog gives us the potential to answer the question: When did something go wrong at the molecular level?” said Dr. Karin Sorenmo, chief of medical oncology at Penn Vet’s Ryan Hospital, who founded the Penn Vet canine mammary tumor program in 2009. “We can also study the benign tumors and ask: What’s different in that one tumor that doesn’t change and become malignant versus another one that does change?”...."
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