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The influence of timing of radiation therapy following breast-conserving surgery on 10-year disease-free survival.

Abstract：

BACKGROUND:The Dutch guidelines advise to start radiation therapy (RT) within 5 weeks following breast-conserving surgery (BCS). However, much controversy exists regarding timing of RT. This study investigated its effect on 10-year disease-free survival (DFS) in a Dutch population-based cohort. METHODS:All women diagnosed with primary invasive stage I-IIIA breast cancer in 2003 treated with BCS+RT were included. Two populations were studied. Population 1 excluded patients receiving chemotherapy before RT. Analyses were stratified for use of adjuvant systemic therapy (AST). Population 2 included patients treated with chemotherapy, and compared chemotherapy before (BCS-chemotherapy-RT) and after RT (BCS-RT-chemotherapy). DFS was estimated using multivariable Cox regression. Locoregional recurrence-free survival (LRRFS), distant metastasis-free survival (DMFS) and overall survival (OS) were secondary outcomes. RESULTS:Population 1 (n=2759) showed better DFS and DMFS for a time interval of >55 than a time interval of <42 days. Patients treated with AST showed higher DFS for >55 days (hazards ratio (HR) 0.60 (95% confidence interval (CI): 0.38-0.94)) and 42-55 days (HR 0.64 (95% CI: 0.45-0.91)) than <42 days. Results were similar for DMFS, while timing did not affect LRRFS and OS. For patients without AST, timing was not associated with DFS, DMFS and LLRFS, but 10-year OS was significantly lower for 42-55 and >55 days compared to <42 days. In population 2 (n=1120), timing did not affect survival in BCS-chemotherapy-RT. In BCS-RT-chemotherapy, DMFS was higher for >55 than <42 days. CONCLUSIONS:Starting RT shortly after BCS seems not to be associated with a better long-term outcome. The common position that RT should start as soon as possible following surgery in order to increase treatment efficacy can be questioned.

journal_name

Br J Cancer

journal_title

British journal of cancer

authors

van Maaren MC,Bretveld RW,Jobsen JJ,Veenstra RK,Groothuis-Oudshoorn CG,Struikmans H,Maduro JH,Strobbe LJ,Poortmans PM,Siesling S

doi

10.1038/bjc.2017.159

subject

Has Abstract

pub_date

2017-07-11 00:00:00

pages

179-188

issue

eissn

0007-0920

issn

1532-1827

pii

bjc2017159

journal_volume

117

pub_type

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The influence of timing of radiation therapy following breast-conserving surgery on 10-year disease-free survival.