HIF1A and nonpapillary renal cell carcinoma: The Kaplan–Meier survival curves revealed a statistically significant decrease in OS (p = 0.038) among ccRCC patients exhibiting a high HIF-1α protein expression compared to those with a low expression (median OS of 1086 and 1844 days, respectively; HR 1.55, 95% CI 1.02–2.35, p = 0.04; Figure 5, Table 4).