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Frequencies of human leucocyte antigen (HLA) class I alleles dependent on different tumor localizations. (a) HLA-A alleles, (b) HLA-B alleles, and (c) HLA-C alleles. HYPO—hypopharynx; LAR—larynx; NC/PNS—nasal cavity/paranasal sinuses; ORO—oropharynx; CUP—carcinoma of unknown primary.
