Several studies regarding other tumour types found the same results, suggesting a more complex function of PD‐L1 in immunosurveillance signalling.67 A possible explanation is that PD‐L1 expression by cancer cells can be considered as a marker of an active host anti‐tumour immune response.68 Another way to address the issue is to consider the heterogeneity of tumour microenvironment in different tumour types. The gene discussed is CD274; the disease is cancer.