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Breast conservation versus mastectomy for patients with T3 primary tumors (>5 cm): A review of 5685 medicare patients
Author(s) -
Bleicher Richard J.,
Ruth Karen,
Sigurdson Elin R.,
Daly John M.,
Boraas Marcia,
Anderson Penny R.,
Egleston Brian L.
Publication year - 2016
Publication title -
cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.052
H-Index - 304
eISSN - 1097-0142
pISSN - 0008-543X
DOI - 10.1002/cncr.29726
Subject(s) - medicine , breast cancer , mastectomy , hazard ratio , confidence interval , oncology , radiation therapy , cancer , epidemiology , malignancy , surgery
BACKGROUND Although breast conservation therapy (BCT) is standard for breast cancer treatment, patients with tumors measuring >5 cm have been excluded from clinical trials. Nevertheless, only a few small retrospective series to date have compared BCT with mastectomy for tumors measuring >5 cm. The current study was performed to determine whether survival is equivalent for BCT versus mastectomy using a large national data set. METHODS Surveillance, Epidemiology, and End Results (SEER)‐Medicare‐linked cases were identified for patients aged ≥66 years undergoing breast conservation for invasive, noninflammatory, nonmetastatic breast cancer between 1992 and 2009. Propensity score‐based adjustment was used to account for demographics and tumor and treatment factors. RESULTS A total of 5685 patients with tumors measuring >5.0 cm underwent breast surgery, with 15.6% receiving BCT. Mean ages of the patients and tumor sizes were similar. Predictors of BCT included neoadjuvant chemotherapy and postoperative radiotherapy use, higher income, breast cancer as a first malignancy, and a higher Charlson Comorbidity Index. Predictors of mastectomy included younger age, nonductal histology, higher grade, numbers of lymph nodes examined and found to be positive, American Joint Committee on Cancer stage III disease, postoperative chemotherapy use, and residential region of the country. Adjusted overall and breast cancer‐specific survival were not different between patients treated with BCT and mastectomy (hazard ratio, 0.934; 95% confidence interval, 0.791‐1.103 [ P = .419] for overall survival; and subdistribution hazard ratio, 1.042; 95% confidence interval, 0.793‐1.369 [ P = .769] for breast cancer‐specific survival), with each improving over time. The median follow‐up was 7.0 years. CONCLUSIONS For Medicare patients with tumors measuring >5 cm, survival is similar between those treated with BCT and mastectomy as for patients with smaller primary tumors. Despite exclusion from randomized trials, BCT may remain an option for patients with larger tumors when deemed clinically and cosmetically amenable to surgical resection. Cancer 2016;122:42–49. © 2015 American Cancer Society .