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Outcomes of Triple-Negative Versus Non-Triple-Negative Breast Cancers Managed with Breast-Conserving Therapy

  • Bhatti, Abu Bakar Hafeez (Department of Surgical Oncology, Shaukat Khanum Memorial Cancer Hospital and Research Centre) ;
  • Khan, Amina Iqbal (Department of Surgical Oncology, Shaukat Khanum Memorial Cancer Hospital and Research Centre) ;
  • Siddiqui, Neelam (Department of Medical Oncology, Shaukat Khanum Memorial Cancer Hospital and Research Centre) ;
  • Muzaffar, Nargis (Department of Medical Oncology, Shaukat Khanum Memorial Cancer Hospital and Research Centre) ;
  • Syed, Aamir Ali (Department of Surgical Oncology, Shaukat Khanum Memorial Cancer Hospital and Research Centre) ;
  • Shah, Mazhar Ali (Department of Radiation Oncology, Shaukat Khanum Memorial Cancer Hospital and Research Centre) ;
  • Jamshed, Arif (Department of Radiation Oncology, Shaukat Khanum Memorial Cancer Hospital and Research Centre)
  • Published : 2014.03.30

Abstract

Background: Triple negative breast cancer is associated with aggressive behavior and high risk of local and regional failure. Aggressive surgical intervention is considered suitable. This makes role of breast conserving therapy (BCT) debatable in these patients. The objective of this study was to compare outcome of BCT for triple negative versus non-triple negative breast cancer. Materials and Methods: Medical records of patients who underwent breast conserving therapy from 1999 to 2009 at Shaukat Khanum Cancer Hospital and had complete receptor status information were extracted. Patients were divided into triple negative breast cancer (TNBC) and non-TNBC. Patient characteristics, medical treatment modalities and adverse events were compared. Expected five year locoregional recurrence free, disease free and overall survival was calculated. The Cox proportional hazard model was used to identify independent predictors of outcome. Results: A total of 194 patients with TNBC and 443 with non-TNBC were compared. Significant difference was present for age at presentation (p<0.0001), family history (p=0.005), grade (p<0.0001) and use of hormonal therapy (p<0.0001). The number of locoregional failures, distant failures and mortalities were not significantly different. No significant difference was present in 5 year locoregional recurrence free (96% vs 92%, p=0.3), disease free (75% vs 74%, p=0.7) and overall survival (78% vs 83%, p=0.2). On multivariate analysis, tumor size, nodal involvement and hormonal treatment were independent predictors of negative events. Conclusions: Breast conserving therapy has comparable outcomes for triple negative and non-triple negative breast cancers.

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