Occurrence of shared nonviral tumor-associated transplantation-type antigens among C3H/He mammary carcinomas

The occurrence of shared nonviral tumor-associated antigens among 18 immunogenic C3H/He mammary carcinomas was investigated in vivo. By cross-immunization and s.c. challenge between pairs of tumors in 37 different combinations, six of the tumors were found to cross-immunize with one to three other tumors. A minimum of three different antigenic specificities were found to be shared among cross-reacting tumors.