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Efficacy of Chemotherapy for ER-Negative and ER-Positive Isolated Locoregional Recurrence of Breast Cancer: Final Analysis of the CALOR Trial. | LitMetric
Irene L. Wapnir, Stanford University School of Medicine, Stanford, CA; Karen N. Price and Shari Gelber, Frontier Science and Technology Research Foundation, Richard D. Gelber, Frontier Science and Technology Research Foundation, Dana-Farber Cancer Institute, Harvard TH Chan School of Public Health, Harvard Medical School, Meredith M. Regan, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA; Stewart J. Anderson, University of Pittsburgh Graduate School of Public Health; Priya Rastogi, University of Pittsburgh Cancer Institute; Norman Wolmark, Allegheny Health Network Cancer Institute, Pittsburgh, PA; André Robidoux, Centre Hospitalier de l'Université de Montréal, Montréal, Quebec; Alexander H.G. Paterson, Tom Baker Cancer Centre, Calgary, Alberta, Canada; Miguel Martín, CIBERONC, Instituto de Investigación Sanitaria Gregorio Marañon, Universidad Complutense, Madrid; José Manuel Baena-Cañada, Hospital Puerta del Mar, Cádiz, Spain; Johan W.R. Nortier, Leids Universitair Medisch Centrum, Leiden, Netherlands; Mothaffar F. Rimawi, Duncan Comprehensive Cancer Center at Baylor College of Medicine, Houston, TX; István Láng, National Institute of Oncology, Budapest, Hungary; Beat Thürlimann, Kantonsspital, St. Gallen; Stefan Aebi, Lucerne Cantonal Hospital and University of Bern, Switzerland; Eleftherios P. Mamounas, Orlando Health University of Florida Health Cancer Center, Orlando, FL; Charles E. Geyer Jr, Virginia Commonwealth University Massey Cancer Center, Richmond, VA; and Alan S. Coates, University of Sydney, Sydney, Australia.
Published: April 2018
AI Article Synopsis
Article Abstract
Purpose Isolated locoregional recurrence (ILRR) predicts a high risk of developing breast cancer distant metastases and death. The Chemotherapy as Adjuvant for LOcally Recurrent breast cancer (CALOR) trial investigated the effectiveness of chemotherapy (CT) after local therapy for ILRR. A report at 5 years of median follow-up showed significant benefit of CT for estrogen receptor (ER)-negative ILRR, but additional follow-up was required in ER-positive ILRR. Patients and Methods CALOR was an open-label, randomized trial for patients with completely excised ILRR after unilateral breast cancer. Eligible patients were randomly assigned to receive CT or no CT and stratified by prior CT, hormone receptor status, and location of ILRR. Patients with hormone receptor-positive ILRR received adjuvant endocrine therapy. Radiation therapy was mandated for patients with microscopically involved margins, and anti-human epidermal growth factor receptor 2 therapy was optional. End points were disease-free survival (DFS), overall survival, and breast cancer-free interval. Results From August 2003 to January 2010, 162 patients were enrolled: 58 with ER-negative and 104 with ER-positive ILRR. At 9 years of median follow-up, 27 DFS events were observed in the ER-negative group and 40 in the ER-positive group. The hazard ratios (HR) of a DFS event were 0.29 (95% CI, 0.13 to 0.67; 10-year DFS, 70% v 34%, CT v no CT, respectively) in patients with ER-negative ILRR and 1.07 (95% CI, 0.57 to 2.00; 10-year DFS, 50% v 59%, respectively) in patients with ER-positive ILRR ( P = .013). HRs were 0.29 (95% CI, 0.13 to 0.67) and 0.94 (95% CI, 0.47 to 1.85), respectively, for breast cancer-free interval ( P = .034) and 0.48 (95% CI, 0.19 to 1.20) and 0.70 (95% CI, 0.32 to 1.55), respectively, for overall survival ( P = .53). Results for the three end points were consistent in multivariable analyses adjusting for location of ILRR, prior CT, and interval from primary surgery. Conclusion The final analysis of CALOR confirms that CT benefits patients with resected ER-negative ILRR and does not support the use of CT for ER-positive ILRR.
