SOX9 and cancer: Double immunostaining for SOX9 to recognize cancer cells and for STING revealed that there are two types of STING-positive cells in the stromal compartment: SOX9 positive/STING positive cells thought to be undergoing epithelial-to-mesenchymal transition (EMT) and SOX9 negative/STING positive cells (Supplemental Fig. 1b), and those with STING expression were considered STING-positive regardless of the expression type in this study.