© 1998 by Oxford University Press
Journal of the National Cancer Institute, Vol. 90, No. 18, 1361-1370,
September 16, 1998
©Copyright 1998 Oxford University Press
ARTICLES |
erB-2 and Response to Doxorubicin in Patients With Axillary Lymph Node-Positive, Hormone Receptor-Negative Breast Cancer
Affiliations of authors: S. Paik, National Surgical Adjuvant Breast and Bowel Project (NSABP) and Department of Human Oncology, Allegheny University of Health Sciences, Pittsburgh, PA, and Lombardi Cancer Center, Georgetown University, Washington, DC; J. Bryant, NSABP and Departments of Statistics and Biostatistics, University of Pittsburgh; C. Park, B. Fisher, E. Tan-Chiu, D. Hyams, E. R. Fisher, D. L. Wickerham, N. Wolmark, NSABP and Department of Human Oncology, Allegheny University of Health Sciences; M. E. Lippman, Lombardi Cancer Center, Georgetown University.
Correspondence to: Soonmyung Paik, M.D., NSABP Pathology Section, East Commons Professional Bldg., Four Allegheny Center5th Floor, Pittsburgh, PA 15212-5234 (spaik{at}pgh.auhs.edu).
Abstract
Background: Overexpression of the erbB-2 protein by breast cancer cells has been suggested to be a predictor of response to doxorubicin. A retrospective study was designed to test this hypothesis. Methods: In National Surgical Adjuvant Breast and Bowel Project protocol B-11, patients with axillary lymph node-positive, hormone receptor-negative breast cancer were randomly assigned to receive either L-phenylalanine mustard plus 5-fluorouracil (PF) or a combination of L-phenylalanine mustard, 5-fluorouracil, and doxorubicin (PAF). Tumor cell expression of erbB-2 was determined by immunohistochemistry for 638 of 682 eligible patients. Statistical analyses were performed to test for interaction between treatment and erbB-2 status (positive versus negative) with respect to disease-free survival (DFS), survival, recurrence-free survival (RFS), and distant disease-free survival (DDFS). Reported P values are two-sided. Results: Overexpression of erbB-2 (i.e., positive immunohistochemical staining) was observed in 239 (37.5%) of the 638 tumors studied. Overexpression was associated with tumor size (P = .02), lack of estrogen receptors (P = .008), and the number of positive lymph nodes (P = .0001). After a mean time on study of 13.5 years, the clinical benefit from doxorubicin (PAF versus PF) was statistically significant for patients with erbB-2-positive tumorsDFS: relative risk of failure (RR) = 0.60 (95% confidence interval [CI] = 0.440.83), P = .001; survival: RR = 0.66 (95% CI = 0.470.92), P = .01; RFS: RR = 0.58 (95% CI = 0.420.82), P = .002; DDFS: RR = 0.61 (95% CI = 0.440.85), P = .003. However, it was not significant for patients with erbB-2-negative tumorsDFS: RR = 0.96 (95% CI = 0.751.23), P = .74; survival: RR = 0.90 (95% CI = 0.691.19), P = .47; RFS: RR = 0.88 (95% CI = 0.671.16), P = .37; DDFS: RR = 1.03 (95% CI = 0.791.35), P = .84. Interaction between doxorubicin treatment and erbB-2 overexpression was statistically significant for DFS (P = .02) and DDFS (P = .02) but not for survival (P = .15) or RFS (P = .06). Conclusions: These data support the hypothesis of a preferential benefit from doxorubicin in patients with erbB-2-positive breast cancer. [J Natl Cancer Inst 1998;90:136170]
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