SMAD4 and neoplasm: To further analyse the expression of STING1 and SMAD4 on the protein level, we constructed a tissue microarray (TMA) containing 50 paired tumour and para‐tumour tissues of iCCA, a tissue microarray containing 113 paired tumour and para‐tumour tissues of pCCA and a tissue microarray containing 119 paired tumour and para‐tumour tissues of dCCA.