tumor-specific transplantation antigen

n.
  1. Any of several surface antigens of virus-transformed tumor cells, which elicit an immune rejection of the virus-free cells when transplanted into an individual that has been immunized against the specific cell-transforming virus.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.