MAP3K8 and nonpapillary renal cell carcinoma: Compared to Grade 1 ccRCC samples, Grade 2 (P = 1.28E-3) and Grade 3 (P = 7.41E-4) ccRCC samples have higher levels of MAP3K8 methylation, while race, gender, age, and nodal metastasis were not implicated in influencing MAP3K8 methylation.