LOSS OF HLA‐A,B,C IN COLORECTAL CARCINOMA IS RELATED TO THE DEGREE OF DE‐DIFFERENTIATION

Abstract
By means of immunoperoxidase staining of frozen sections 100 primary colorectal carcinomas and 19 metastases were studied for the expression of HLA-A,B,C antigens. A substantial number of the tumours showed a deficient class I expression. The loss of HLA-A,B,C correlated with the degree of de-differentiation.