CD274 and neoplasm: A classification based on both TILs and tumour PD-L1 expression, named tumour microenvironment immune type (TMIT), recognizes four immunotypes: type I (TILhigh/PD-L1pos), type II (TILlow/PD-L1neg), type III (TILlow/ PD-L1pos) and type IV (TILhigh/ PD-L1neg) [20].