PIEZO1 and nonpapillary renal cell carcinoma: The protein–protein interaction (PPI) networks of genes positively correlated with PIEZO1 in ccRCC were constructed using STRING (https://string-db.org; accessed on 2 March 2025) and visualized in Cytoscape software (version 3.10.3, Cytoscape Consortium, San Diego, CA, USA).