Reduced expression of steroid sulfatase in primary colorectal cancer.

Colorectal cancer (CRC) is considered an estrogen-dependent malignancy, and intratissue estrogen concentration can be controlled by steroid sulfatase (STS). Little is known about changes in the expression of STS during the development of CRC. Therefore, we analysed the STS mRNA levels in primary colonic adenocarcinoma tissues and adjacent histopathologically unchanged colonic mucosa from patients who underwent radical colon resection (n=90). We found a statistically significant decrease in STS transcript levels in CRC (P=0.0453). Moreover, we found that sodium butyrate (NaBu) significantly upregulated STS transcript levels in DLD-1 and HCT116 CRC cells. Our results suggest that STS expression can be decreased in the process of large intestinal carcinogenesis. Moreover, we observed that NaBu might increase STS expression in CRC cells.