4.7 Article

Association of Locoregional Control With High Body Mass Index in Women Undergoing Breast Conservation Therapy for Early-Stage Breast Cancer

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijrobp.2016.04.020

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Funding

  1. National Center for Research Resources
  2. National Center for Advancing Translational Sciences
  3. Office of the Director, National Institutes of Health (NIH) [8KL2TR000056, 8UL1TR000055]

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Purpose: Obesity, as measured by the body mass index (BMI), is a risk factor for distant recurrence and decreased survival in breast cancer. We sought to determine whether the BMI correlated with local recurrence and reduced survival in a cohort of predominantly obese women treated with breast conservation therapy. Methods and Materials: From 1998 to 2010, 154 women with early-stage invasive breast cancer and 39 patients with ductal carcinoma in situ underwent prone whole breast irradiation. Cox proportional hazards regression, Kaplan-Meier methods with the log-rank test, and multivariate analysis were used to explore the association of the outcomes with the BMI. Results: The median patient age was 60 years, and the median follow-up duration was 73 months. The median BMI was 33.2 kg/m(2); 91% of the patients were overweight (BMI >= 25 kg/m(2)) and 69% of the patients were clinically obese (BMI >= 30 kg/m(2)). The BMI was significantly associated with the locoregional recurrence-free interval for patients with invasive cancer and ductal carcinoma in situ (hazard ratio [HR], 1.09; P = .047). Also, a trend was seen for increased locoregional recurrence with a higher BMI (P = .09) for patients with invasive disease, which was significant when examining the outcomes with a BMI stratified by the median value of 33.2 kg/m(2) (P = .008). A greater BMI was also significantly associated with decreased distant recurrence-free interval (HR, 1.09; P = .011) and overall survival (HR, 1.09; P = .004); this association remained on multivariate analysis (distant recurrence-free interval, P = .034; overall survival, P = .0007). Conclusions: These data suggest that the BMI might affect the rate of locoregional recurrence in breast cancer patients. A higher BMI predicted a worse distant recurrence-free interval and overall survival. The present investigation adds to the increasing evidence that BMI is an important prognostic factor in early-stage breast cancer treated with breast conservation therapy. (C) 2016 Elsevier Inc. All rights reserved.

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