ALDH1L1 and nonpapillary renal cell carcinoma: QPCR revealed that methylation and/or deletions considerably contribute to inactivation of the majority of examined genes (LRRN1, GORASP1, IQSEC1, FOXP1, GNAI2, FGD5, PLCL2, and ALDH1L1) in ccRCC.