SLC7A7 and chromophobe renal cell carcinoma: However, SLC7A7 expression was significantly lower in KICH (kidney chromophobe), KIRC (kidney renal clear cell carcinoma), KIRP (kidney renal papillary cell carcinoma), LIHC (liver hepatocellular carcinoma), LUAD (lung adenocarcinoma) and LUSC (lung squamous cell carcinoma) than in normal controls (Fig. 1b).