Definition:
A transplantable carcinoma of the rat that originally appeared spontaneously in the mammary gland of a pregnant albino rat, and which now resembles a carcinoma in young transplants and a sarcoma in older transplants. (Stedman, 25th ed)
Synonym(s):
Carcinosarcoma 256, Walker /
Walker Carcinoma 256 /
Walker Carcinosarcoma 256 /