AQP5 was expressed at lower levels in granular renal cell carcinoma (fold change = −1.803), chromophobe renal cell carcinoma (fold change = −2.080), papillary renal cell carcinoma (fold change = −1.508), and renal oncocytoma (fold change = −1.759) samples than in normal samples. This evidence concerns the gene AQP5 and kidney oncocytoma.