VHL and nonpapillary renal cell carcinoma: Based on a ratio of 3 to 1, we divided 217 ccRCC patients carrying wild-type VHL into a training set (163 cases) and a test set (54 cases), attributed each patient in the training set with a risk score, and separated patients into a high-risk group (81 patients) and a low-risk group (82 patients) with the median of risk scores 1.77 as the threshold.