After excluding potential low‐quality cells and removing a cluster with high expression of epithelial markers (such as EPCAM, KRT8, KRT19) to distinguish fibroblasts from tumour cells undergoing epithelial‐mesenchymal transition (EMT), 13 subclusters of fibroblasts were retained (Figure 1D, Table S3). This evidence concerns the gene KRT8 and neoplasm.