The Role of Surgery in Metastatic Breast Cancer

  • The role of locoregional treatment in the setting of de novo metastatic breast cancer:
    • Is controversial
  • Typically, surgery:
    • Has been reserved for palliation
  • A 2012 meta-analysis of 15 retrospective studies showed:
    • Resection of the primary tumor:
      • Was associated with increased overall survival:
      • OS; HR 0.69, 95% CI 0.63 to 0.77, P<0.00001
    • Unfortunately, recent prospective studies have shown conflicting results:
      • A Turkish study showed improved survival at a median of 40 months follow-up, especially in more indolent forms of breast cancer
      • In contrast, a U.S. study did not show improvement in survival associated with surgery:
        • Determinants of improved survival were related to response to therapy
      • An Italian study showed improvement in survival in patients with HER2 positive disease after first-line trastuzumab-based therapy
      • In addition, an Indian study by Badwe et al. did not show a survival advantage with resection of the primary cancer:
        • At a median follow-up of 23 months, the overall survival was 41.9% in the locoregional surgical arm vs. 43.0% in the non-locoregional treatment arm
  • Each of these studies has potential bias flaws but:
    • Show potential benefit of resection in select patients with high functional status and good response to optimal systemic therapy
  • While awaiting the results of ECOG E2108 clinical trial:
    • Surgery in stage IV breast cancer patients should be discussed in a multidisciplinary setting:
      • Taking into account comorbidities, response to therapy, and tumor burden.
  • References
    • Poggio F, Lambertini M, de Azambuja E. Controversies in oncology: Surgery of the primary tumour in patients presenting with de novo metastatic breast cancer: to do or not to do? ESMO Open 2018;3:e000324.
    • Wu SG, Zhang WW, Sun JY, et al. The survival benefits of local surgery in stage IV breast cancer are not affected by breast cancer subtypes: a population-based analysis. Oncotarget. 2017;8(40):67851-67860. Published 2017 Jun 29.
    • Soran A, Ozmen V, Ozbas S, et al. randomized trial comparing resection of primary tumor with no surgery in Stage IV breast cancer at presentation: Protocol MF07-01. Ann Surg Oncol. 2018;25(11): 3141-3149.
    • R Badwe, R Hawaldar, N Nair, et al.: Locoregional treatment versus no treatment of the primary tumour in metastatic breast cancer: an open-label randomised controlled trial. Lancet Oncol. 2015;16(13):1380-1388

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