Possible benefits from post-mastectomy radiotherapy in nodenegative breast cancer patients: A multicenter analysis in Korea (KROG 14-22)

Hae Jin Park, Kyung Hwan Shin, Jin Ho Kim, Seung Do Ahn, Su Ssan Kim, Yong Bae Kim, Won Park, Yeon Joo Kim, Hyun Soo Shin, Jin Hee Kim, Sun Young Lee, Kyubo Kim, Kyung Ran Park, Bae Kwon Jeong

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Purpose: This study was performed to identify a subset of patients who may benefit from post-mastectomy radiotherapy (PMRT) among node-negative breast cancer patients. Materials and Methods: We retrospectively reviewed 1,828 patients with pT1- 2N0 breast cancer, treated with mastectomy without PMRT from 2005 to 2010 at 10 institutions. Univariate and multivariate analyses for locoregional recurrence (LRR) and any first recurrence (AFR) were performed according to clinicopathologic factors and biologic subtypes. Results: During a median follow-up period of 5.9 years (range: 0.7-10.4 years), 98 patients developed AFR (39 isolated LRR, 13 LRR with synchronous distant metastasis, and 46 isolated distant metastasis), and 52 patients developed LRR. The 7-year LRR and AFR rates were 3.8% and 6.7%, respectively. Multivariate analysis revealed that age of ≤ 40 years (p<0.001) and T2 stage (p=0.013) were independent risk factors for LRR. The 7-year LRR rates were 2.5% with no risk factors, 4.5% with one risk factor, and 12.4% with two risk factors. Multivariate analysis for AFR revealed that age of ≤ 40 years (p<0.001), T2 stage (p<0.001), and triple-negative biological subtype (p=0.045) were independent risk factors for AFR. The 7-year AFR rates were 3.9% with no risk factors, 8.4% with one risk factor, and 15.7% with two to three risk factors. Conclusions: Mastectomy without PMRT is a sufficient local treatment for pT1- 2N0M0 breast cancer. Nevertheless, PMRT might be considered for patients with two or three risk factors, among those of young age, with T2 tumors, and with the triplenegative biological subtype based on LRR and AFR.

Original languageEnglish
Pages (from-to)59800-59809
Number of pages10
JournalOncotarget
Volume8
Issue number35
DOIs
Publication statusPublished - 2017

Bibliographical note

Funding Information:
This work was supported by Research Resettlement Fund for the new faculty of Seoul National University.

Publisher Copyright:
© Park et al.

All Science Journal Classification (ASJC) codes

  • Oncology

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