FN1 and neoplasm: To extensively study the influence of an acidic environment on the occurrence of EMT and drug resistance of tumour cells, we only focused on detecting the expression levels of epithelial markers (α‐catenin and β‐catenin) and mesenchymal markers (vimentin and fibronectin) in follow‐up studies (Figures 3, 4, 5, 6, 7).