KYAT1 and nonpapillary renal cell carcinoma: Kynurenine formamidase (AFMID), kynureninase (KYNU) and kynurenine aminotransferase 1 and 3 (KYAT1, KYAT3) were all observed in the chromophobe data set, while AFMID and KYAT3 were also detected in the ccRCC data.