Tumour re‐emergence in this setting was accompanied by decreased OVA and MHC class I (H2‐k1) gene expression, consistent with decreased antigen presentation; tumour re‐emergence was also accompanied by decreased PD‐L1 (Cd274) gene expression (Fig 2E), but this probably followed decreased MHC class I‐mediated antigen presentation and thereby T‐cell recruitment and inflammation. This evidence concerns the gene CD274 and neoplasm.