HS6ST2 and chromophobe renal cell carcinoma: In contrast, tumor tissues had lower levels of HS6ST2 than healthy tissues in breast invasive carcinoma (BRCA), kidney renal papillary cell carcinoma (KIRP), uterine corpus endometrial carcinoma (UCEC), kidney renal clear cell carcinoma (KIRC), and kidney chromophobe (KICH) (Fig. 1A).