Secondary malignancies after partial versus whole breast irradiation: a systematic review and meta-analysis
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Xin-Bin Pan1, Shi-Ting Huang1, Yan-Ming Jiang1, Jia-Lin Ma1, Xiao-Dong Zhu1
1Department of Radiation Oncology, Cancer Hospital of Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
Xiao-Dong Zhu, email: [email protected]
Keywords: breast cancer, breast-conserving therapy, partial breast irradiation, whole breast irradiation, secondary malignancies
Received: August 26, 2016 Accepted: September 26, 2016 Published: October 04, 2016
Secondary malignancies are a common complication for patients receiving radiotherapy. Here, we compared rates of secondary malignancies after partial breast irradiation (PBI) and whole breast irradiation (WBI). The MEDLINE, EMBASE, and the Cochrane Library databases were systematically searched to identify relevant randomized clinical trials comparing PBI with WBI in breast cancer patients treated with breast-conserving therapy. Four studies including 2,185 patients were selected. Compared to WBI, the pooled odds ratios (OR) for contralateral breast cancer were 0.86 (95% confidence interval (CI) 0.31–2.42; p = 0.78) after 5 years and 1.15 (95% CI 0.43-3.09; p = 0.78) after 10 years for PBI. The pooled ORs for secondary non-breast cancer were 0.91 (95% CI 0.49-1.67; p = 0.77) after 5 years and 1.20 (95% CI 0.39-3.66; p = 0.75) after 10 years for PBI compared to WBI. These results demonstrate that the risk of secondary malignancies is similar for PBI and WBI after breast-conserving radiotherapy.
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