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Post-mastectomy Radiation: Should Subtype Factor into the Decision?

Adena S Scheer1, Francis S W Zih2, Ellen Maki3

  • 1Li Ka Shing Knowledge Institute, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada.

Annals of Surgical Oncology
|March 24, 2016
PubMed
Summary
This summary is machine-generated.

Molecular subtype does not influence post-mastectomy radiation decisions, but triple-negative breast cancer (TNBC) shows higher locoregional recurrence risk. Further research is needed to optimize radiation strategies for TNBC patients.

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Area of Science:

  • Oncology
  • Breast Cancer Research
  • Radiation Oncology

Background:

  • Current post-mastectomy radiation (PMRT) guidelines do not incorporate molecular subtype into treatment decisions.
  • The study investigates the association between molecular subtype and PMRT receipt.
  • It also examines locoregional recurrence (LRR) rates across different subtypes.

Purpose of the Study:

  • To determine if molecular subtype influences PMRT decisions in an academic cancer center.
  • To assess differences in LRR based on molecular subtype.
  • To identify factors associated with PMRT receipt and LRR in breast cancer patients.

Main Methods:

  • Retrospective analysis of 884 patients with invasive breast cancer treated with primary mastectomy.
  • Logistic regression models to identify predictors of PMRT.
  • Kaplan-Meier and Cox proportional hazards regression to analyze time to LRR.

Main Results:

  • Molecular subtype was not associated with PMRT receipt on multivariate analysis.
  • Triple-negative (TN) breast cancers were smaller and had lower nodal burden but exhibited a significantly higher LRR rate (HR 5.70).
  • Factors associated with PMRT included age <50, lymphovascular invasion, T stage, N stage, and margin status.

Conclusions:

  • Receptor status (molecular subtype) is not linked to PMRT decisions, despite significant LRR differences.
  • TN breast cancers present a higher LRR risk, even with smaller tumor size and less nodal involvement.
  • Chemotherapy, lymphovascular invasion, and TN status are key predictors of LRR.