Clinical implications of discordance in HER2 reassessment from HercepTest to 4B5 in metastatic breast cancer.

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Title: Clinical implications of discordance in HER2 reassessment from HercepTest to 4B5 in metastatic breast cancer.
Authors: Yamaguchi Y; Department of Medical Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo, 104-0045, Japan.; Division of Endocrine & Breast Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan., Hoshino M; Department of Medical Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo, 104-0045, Japan., Shimoi T; Department of Medical Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo, 104-0045, Japan. tshimoi@ncc.go.jp., Tamura H; Department of Medical Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo, 104-0045, Japan., Natori Y; Department of Medical Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo, 104-0045, Japan., Saiki T; Department of Medical Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo, 104-0045, Japan., Yamanaka T; Department of Medical Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo, 104-0045, Japan., Kitadai R; Department of Medical Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo, 104-0045, Japan., Saito A; Department of Medical Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo, 104-0045, Japan., Kita S; Department of Medical Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo, 104-0045, Japan., Maejima A; Department of Medical Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo, 104-0045, Japan., Kojima Y; Department of Medical Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo, 104-0045, Japan., Sudo K; Department of Medical Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo, 104-0045, Japan., Maeshima AM; Department of Diagnostic Pathology, National Cancer Center Hospital, Tokyo, Japan., Murata T; Department of Breast Surgery, National Cancer Center Hospital, Tokyo, Japan., Takayama S; Department of Breast Surgery, National Cancer Center Hospital, Tokyo, Japan., Naoi Y; Division of Endocrine & Breast Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan., Yonemori K; Department of Medical Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo, 104-0045, Japan., Yoshida M; Department of Diagnostic Pathology, National Cancer Center Hospital, Tokyo, Japan.
Source: Breast cancer research and treatment [Breast Cancer Res Treat] 2026 Jun 22; Vol. 217 (3). Date of Electronic Publication: 2026 Jun 22.
Publication Type: Journal Article
Journal Info: Publisher: Kluwer Academic Country of Publication: Netherlands NLM ID: 8111104 Publication Model: Electronic Cited Medium: Internet ISSN: 1573-7217 (Electronic) Linking ISSN: 01676806 NLM ISO Abbreviation: Breast Cancer Res Treat Subsets: MEDLINE
Database: MEDLINE Ultimate
Description
ISSN:1573-7217
DOI:10.1007/s10549-026-07994-6