Detection of cellular immunity to rous tumors of chickens by the leukocyte migration inhibition reaction.

Peripheral blood leukocytes obtained from Rous sarcoma-bearing chickens were tested for their ability to be inhibited from migrating in vitro by soluble tumor extract. It was found that the inhibition of leukocytes from chickens with regressing Rous tumors was significantly greater than that of chickens with progressing tumors or non-tumor bearing controls.