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- W2886556475 abstract "Abstract Human epidermal growth factor receptor 2 (HER2) is a target of the HER2 inhibitor trastuzumab, which has been administered to HER2‐positive breast cancer patients. However, the therapeutic effects of HER2 inhibitor monotherapy are not always clinically effective as compared with cotreatment with chemotherapy. Therefore, it has become pivotal to predict the therapeutic efficacy of trastuzumab monotherapy prior to administration. Recently, carcinoembryonic antigen‐related cell adhesion molecule 6 (CEACAM6) has been reported to be a HER2‐related factor. The aim of the present study was to explore the therapeutic mechanism of trastuzumab, including the relevance of CEACAM6 expression. CEACAM6/HER2‐double‐positive human breast carcinoma cell lines BT‐474, HCC‐1419 and MDA‐MB‐361 were used in this study. CEACAM6 knockdown decreased the inhibitory effects of trastuzumab in the trastuzumab‐sensitive BT‐474 and HCC‐1419 cells, but not in the trastuzumab‐resistant MDA‐MB‐361 cells. We examined the interaction between CEACAM6 and HER2 by using a proximity ligation assay (PLA). The interaction was detected in BT‐474 and HCC‐1419 cells, but not in MDA‐MB‐361 cells, and was significantly associated with in vitro trastuzumab therapeutic sensitivity. We further analysed the status of CEACAM6 and HER2 and their interaction in archival pathology specimens, also using PLA. The interaction was detected only in CEACAM6/HER2‐double‐positive breast cancer cases, and their PLA score was significantly associated with the efficacy of trastuzumab treatment. Therefore, evaluation of the CEACAM6–HER2 interaction could serve as a marker to predict the efficacy of trastuzumab monotherapy in breast cancer patients. Copyright © 2018 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd." @default.
- W2886556475 created "2018-08-22" @default.
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- W2886556475 date "2018-10-04" @default.
- W2886556475 modified "2023-09-26" @default.
- W2886556475 title "The interaction between carcinoembryonic antigen-related cell adhesion molecule 6 and human epidermal growth factor receptor 2 is associated with therapeutic efficacy of trastuzumab in breast cancer" @default.
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- W2886556475 doi "https://doi.org/10.1002/path.5148" @default.
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