Carcinoma 256, Walker

**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)

**Tree numbers:** - C04.557.435.290.210 - C04.557.450.795.290.210 - C04.619.045

**Synonyms:** - Carcinosarcoma 256, Walker