CP and neoplasm: Through gene expression analysis of bulk and single‐cell transcriptomic data of primary tumour samples (from TCGA and other studies, respectively), we show that (a) the expression of IP was relatively lower than CP in both tumours and normals; (b) the expression of IP was not only predominant in immune cells infiltrating the tumours but also in the subset of tumour epithelial cells (around 33% of the total epithelial cells).