Estrogen receptor beta is expressed in human colorectal adenocarcinoma - PubMed (original) (raw)
Estrogen receptor beta is expressed in human colorectal adenocarcinoma
D Witte et al. Hum Pathol. 2001 Sep.
Abstract
Estrogen receptor beta (ER-beta) has recently been detected in a human colon cancer cell line. The aim of this work was to determine whether ER-beta is expressed in human colorectal carcinoma (CRC) tissue and the extent of this expression. ER-beta expression in CRC was investigated by immunohistochemical staining of sections of formalin-fixed, paraffin-embedded tissue from 55 CRC. The percent of positive cells was recorded. ER-beta immunoreactivity was always present in normal epithelium and adenomas in the same sections of some CRC and was always nuclear. In CRC, nuclear ER-beta immunoreactivity was detected in >10% of the cancer cells in 67% of the cases and was almost always associated with cytoplasmic immunoreactivity. There were no statistically significant differences between the ER-beta-positive and -negative groups in regard to depth of invasion, nodal metastases, or survival, regardless of the cut-off value used. We conclude that (1) a significant number of CRCs are positive for ER-beta. (2) estrogen may play an important role in the proliferation of normal colonic epithelium, and (3) there is differential localization of ER-beta immunoreactivity between normal colon, adenomas, and CRCs. Whether different ER-beta isoforms are differentially expressed in CRCs, and whether human CRCs respond to treatment with antiestrogens, is the subject of studies currently in progress.
Copyright 2001 by W.B. Saunders Company
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