BCAR1/p130Cas expression in untreated and acquired tamoxifen-resistant human breast carcinomas.

Abstract:

:High BCAR1/p130Cas expression in primary breast tumour cytosol predicts a poor chance of response recurrent disease to tamoxifen treatment in patients with oestrogen receptor (ER)-positive breast carcinomas. In this study, we assessed whether BCAR1/p130Cas expression is altered during acquisition of anti-oestrogen resistance. BCAR1/p130Cas protein was quantitatively measured by chemiluminescent Western blot analysis in the cytosol of 34 predominantly ER(+) carcinomas that initially responded to primary tamoxifen treatment and subsequently progressed (n = 22 ) or developed during adjuvant tamoxifen treatment (n = 12) and compared to 54 untreated ER(+) human breast carcinomas. We did not detect significant differences in the level of BCAR1/p130Cas protein in untreated and acquired tamoxifen-resistant carcinomas. Our results indicate that in tumour progression towards tamoxifen resistance, increase of BCAR1/p130Cas may be only one of the molecular mechanisms. Thus, high BCAR1/p130Cas protein levels appear to be a hallmark for intrinsic resistance to tamoxifen in breast carcinomas.

journal_name

Int J Cancer

authors

van der Flier S,Chan CM,Brinkman A,Smid M,Johnston SR,Dorssers LC,Dowsett M

doi

10.1002/1097-0215(20000920)89:5<465::aid-ijc11>3.0

keywords:

subject

Has Abstract

pub_date

2000-09-20 00:00:00

pages

465-8

issue

5

eissn

0020-7136

issn

1097-0215

pii

10.1002/1097-0215(20000920)89:5<465::AID-IJC11>3.0

journal_volume

89

pub_type

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