Then, the expression of four adenosine receptors (ARs): ADORA1, ADORA2A, ADORA2B and ADORA3 in PC were analysed, and the results indicated that ADORA2A, ADORA2B and ADORA3 were significantly up‐regulated in PC tissues (Figure 6B‐D), which was reported to be associated with tumour immune escape.8, 30. This evidence concerns the gene ADORA2B and pachyonychia congenita.