T-cell Responses to TP53 "Hotspot" Mutations and Unique Neoantigens Expressed by Human Ovarian Cancers

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
Drew C DenigerSteven A Rosenberg

Abstract

Purpose: This was a study prospectively evaluating intratumoral T-cell responses to autologous somatic mutated neoepitopes expressed by human metastatic ovarian cancers.Patients and Methods: Tumor-infiltrating lymphocytes (TIL) were expanded from resected ovarian cancer metastases, which were analyzed by whole-exome and transcriptome sequencing to identify autologous somatic mutations. All mutated neoepitopes, independent of prediction algorithms, were expressed in autologous antigen-presenting cells and then cocultured with TIL fragment cultures. Secretion of IFNγ or upregulation of 41BB indicated a T-cell response.Results: Seven women with metastatic ovarian cancer were evaluated, and 5 patients had clear, dominant T-cell responses to mutated neoantigens, which were corroborated by comparison with the wild-type sequence, identification of the minimal epitope, human leukocyte antigen (HLA) restriction element(s), and neoantigen-specific T-cell receptor(s). Mutated neoantigens were restricted by HLA-B, -C, -DP, -DQ, and/or -DR alleles and appeared to principally arise from random, somatic mutations unique to each patient. We established that TP53 "hotspot" mutations (c.659A>G; p.Y220C and c.733G>A; p.G245S) expressed by two dif...Continue Reading

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