RCC2 and nonpapillary renal cell carcinoma: To assess whether the extra genes could increase iPSC colony formation and NANOG positivity, ccRCC cells were transduced with lentiviral particles carrying the SKOM reprogramming factors and additionally electroporated with pCE-mp53DD and pCXB-EBNA1, resulting in RCC2 + LV-SKOM + EBNA 1 + mp53DD cells.