Originally published as JCO Early Release 10.1200/JCO.2005.00.661 on February 14 2005
Journal of Clinical Oncology, Vol 23, No 11 (April 10), 2005: pp. 2460-2468
© 2005 American Society of Clinical Oncology.
Neoadjuvant Trastuzumab Induces Apoptosis in Primary Breast Cancers
Syed K. Mohsin,
Heidi L. Weiss,
M. Carolina Gutierrez,
Gary C. Chamness,
Rachel Schiff,
Michael P. DiGiovanna,
Chun-Xia Wang,
Susan G. Hilsenbeck,
C. Kent Osborne,
D. Craig Allred,
Richard Elledge,
Jenny C. Chang
From the Breast Center at Baylor College of Medicine/The Methodist Hospital; Department of Pathology, Baylor College of Medicine, Houston, TX; and Department of Internal Medicine, Yale Cancer Center, New Haven, CT
Address reprint requests to Jenny C. Chang, MD, Breast Center at Baylor College of Medicine/The Methodist Hospital, 1 Baylor Plaza, MS 600, Houston, TX 77030; e-mail: jcchang{at}breastcenter.tmc.edu.
PURPOSE: Greater understanding of the cellular response in trastuzumab-treated patients will provide insight into the clinical management of patients.
PATIENTS AND METHODS: We performed a neoadjuvant trial in 35 patients with locally advanced HER-2/neu overexpressing breast cancers who received weekly trastuzumab given as a single agent for the first 3 weeks, followed by a combination of trastuzumab and docetaxel for 12 weeks before surgery. Sequential core biopsies were taken at baseline and within weeks 1 and 3 after the first dose of trastuzumab. Clinical response to trastuzumab was assessed by tumor measurements on day 22 before chemotherapy. Core biopsies were assessed by immunohistochemistry for cell cycle and proliferation (Ki67, p27, phosphorylated [p] -MAPK), apoptosis and survival (apoptotic index, p-Akt), epidermal growth factor receptor, and total and p-HER-2.
RESULTS: There was early tumor regression with a median decrease of 20.0% (range. 0% to 60.4%) after only 3 weeks of trastuzumab, and eight patients (23%) had a partial response. Consistent with the clinical regressions, apoptosis was significantly induced (median increase from 3.5% to 4.7%; P = .006) within week 1, a 35% increase above baseline. No significant change in epidermal growth factor receptor score was observed in week 1, without changes in total or p-HER-2 expression. Tumors with high baseline Ki67 were less likely to respond (P = .02).
CONCLUSION: In primary breast cancers, trastuzumab substantially induces apoptosis, providing a molecular explanation for both its therapeutic efficacy and its successful combination with cytotoxic chemotherapy.
Supported in part by the R21 CA 87649-01 from the National Cancer Institute, a Grant-in-Aid from Genentech, Inc., the Emma Jacobs Clinical Breast Cancer Fund, the Breast Cancer Research Foundation, and the Breast Cancer SPORE, P50 CA50183 from the National Cancer Institute.
Terms in blue are defined in the glossary, found at the end of this issue and online at www.jco.org.
Authors' disclosures of potential conflicts of interest are found at the end of this article.
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