Background: The purpose of this meta-analysis is to evaluate the efficacy and safety of altered radiation fraction size on outcomes for early breast cancer patients.
Methods: A search of MEDLINE, EMBASE, WEB OF SCIENCE, Cochrane Library and ClinicalTrials.gov was conducted. Quality of the randomized controlled trials (RCTs) or non-RCTs were evaluated according to Cochrane's risk of bias tool or Methodological Index for non-Randomized Studies (MINORS). Pooled risk ratio (RR) and 95% confidence interval (CI) were calculated. Subgroup analysis was applied according to different fraction dose and sensitivity analysis was performed according to RCTs or non-RCTs.
Results: 23 studies were included in this systematic review. Meta-analysis demonstrated hypofractionation radiotherapy (HFRT) was associated with decreased grade 2/3 acute skin reactions compared with conventional fraction RT (CFRT), either 2.5-3.0 Gy per fraction or 5.0-6.5 Gy per fraction. HFRT with 2.5-3.0 Gy per fraction significantly decreased moderate/marked photographic changes in breast appearance compared with CFRT [RR = 0.80, 95% CI (0.70, 0.91), P = 0.001], while HFRT with more than 3.0 Gy per fraction significantly increased moderate/marked photographic changes [RR = 1.21, 95% CI (1.06, 1.38), P = 0.004]. In addition HFRT cost one-third lower than CFRT. Regarding to local regional recurrence, distant metastasis, overall survival, disease free survival, excellent/good cosmetic comes, symptomatic radiation pneumonitis, ischemic heart disease and symptomatic rib fracture, there was no significant difference between two arms.
Conclusions: Based on available evidence, HFRT with 2.5-3.0 Gy per fraction should be the better choice for treatment of early breast cancer patients.
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