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. 2023 May 23;21:345. doi: 10.1186/s12967-023-04200-9

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Mechanism of melanoma resistance to PD-1 inhibitors. The main mechanisms of melanoma resistance to PD-1 inhibitors include: (1) Insufficient immunogenicity of tumor; (2) MHC dysfunction caused by B2M mutation; (3) CD8⁺T cells transformed into depleted T cells (Tex) due to continuous stimulation of tumor antigen; (4) IFN- γ signal plays an immunosuppressive role; (5) interference from other cells in tumor microenvironment. MHC: Major histocompatibility complex; B2M: β 2-microglobulin; APC: Antigen-presenting cells; STAT: Signal transducer and activator of transcription; JAK: Janus Kinase; TAM: Tumor-associated macrophages; MDSC: Myeloid-derived suppressor cells