Lack of expression of HLA antigens on choriocarcinoma cell lines.

A panel of monoclonal antibodies against HLA--A, B, C, DRw, beta 2 m and other determinants on human cells has been used in indirect trace binding and absorption assays to determine the distribution of these antigens on choriocarcinoma cell lines. HLA--A, B, C, DRw and beta 2 m were not found on these cell lines, while other human antigens expressed on most human tissues were expressed on all the lines.