Deregulation of HLA-I in cancer and its central importance for immunotherapy

被引:110
作者
Hazini, Ahmet [1 ]
Fisher, Kerry [1 ]
Seymour, Len [1 ]
机构
[1] Univ Oxford, Dept Oncol, Oxford, Oxon, England
关键词
immunity; cellular; immunotherapy; MHC CLASS-I; ANTIGEN CLASS-I; HUMAN-MELANOMA CELLS; G EXPRESSION; UP-REGULATION; COLORECTAL-CANCER; DOWN-REGULATION; LUNG-CANCER; IFN-GAMMA; HEPATOCELLULAR-CARCINOMA;
D O I
10.1136/jitc-2021-002899
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
It is now well accepted that many tumors undergo a process of clonal selection which means that tumor antigens arising at various stages of tumor progression are likely to be represented in just a subset of tumor cells. This process is thought to be driven by constant immunosurveillance which applies selective pressure by eliminating tumor cells expressing antigens that are recognized by T cells. It is becoming increasingly clear that the same selective pressure may also select for tumor cells that evade immune detection by acquiring deficiencies in their human leucocyte antigen (HLA) presentation pathways, allowing important tumor antigens to persist within cells undetected by the immune system. Deficiencies in antigen presentation pathway can arise by a variety of mechanisms, including genetic and epigenetic changes, and functional antigen presentation is a hard phenomenon to assess using our standard analytical techniques. Nevertheless, it is likely to have profound clinical significance and could well define whether an individual patient will respond to a particular type of therapy or not. In this review we consider the mechanisms by which HLA function may be lost in clinical disease, we assess the implications for current immunotherapy approaches using checkpoint inhibitors and examine the prognostic impact of HLA loss demonstrated in clinical trials so far. Finally, we propose strategies that might be explored for possible patient stratification.
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收藏
页数:17
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