HLA class I expression on human ovarian carcinoma cells correlates with T-cell infiltration in vivo and T-cell expansion in vitro in low concentrations of recombinant interleukin-2

Cellular Immunology
S KooiR S Freedman

Abstract

This study was carried out to determine whether HLA class I or class II expression on ovarian tumor cells and lymphocytic infiltration of the epithelial ovarian carcinoma (EOC) tissues were responsible for the ability to expand tumor-infiltrating lymphocytes (TIL) in vitro in low concentrations of recombinant interleukin-2 (rIL-2). Immunohistochemical analysis was performed using monoclonal antibodies that recognize framework determinants of either HLA class I or HLA class II or leukocyte differentiation antigens (LCA, CD3, CD4, and CD8). Cryostat sections of EOC had HLA class I and HLA class II expression on at least 5% of tumor cells in 18 of 20 specimens (90%). From another portion of the same tumor specimens T-cell lines were developed from TIL in low concentrations of rIL-2 (200-600 IU/ml) in 7 of 17 patients. Tumors from which TIL were expanded in vitro with rIL-2 had significantly higher proportions of HLA class I-positive tumor cells (73 +/- 10%) compared to tumors from which TIL failed to grow (40 +/- 10%) (P = 0.036). However, there was no difference in the proportions of HLA class II-positive tumor cells between the two groups. Tumor specimens of patients whose TIL were expanded in rIL-2 had significantly higher numb...Continue Reading

Citations

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