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BCAR1/p130Cas expression in untreated and acquired tamoxifen‐resistant human breast carcinomas
Author(s) -
van der Flier Silvia,
Chan Christina M.W.,
Brinkman Arend,
Smid Marcel,
Johnston Stephen R.D.,
Dorssers Lambert C.J.,
Dowsett Mitchell
Publication year - 2000
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/1097-0215(20000920)89:5<465::aid-ijc11>3.0.co;2-o
Subject(s) - tamoxifen , breast cancer , antiestrogen , cancer research , oncology , mammary gland , western blot , medicine , biology , cancer , gene , genetics
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. Int. J. Cancer 89:465–468, 2000. © 2000 Wiley‐Liss, Inc.