Jose Vila1, Sara Gandini2, Oreste Gentilini3. 1. Division of Breast Surgery, European Institute of Oncology, Milan, Italy. 2. Division of Epidemiology and Biostatistics, European Institute of Oncology, Milan, Italy. 3. Division of Breast Surgery, European Institute of Oncology, Milan, Italy. Electronic address: oreste.gentilini@ieo.it.
Abstract
OBJECTIVES: Young age is an independent risk factor for local recurrence after breast conserving surgery (BCS) and whole breast radiotherapy (WBRT) for breast cancer. The aim of this study was to carry out a systematic meta-analysis to address the issue as to whether type of surgery might have an impact on overall survival (OS) of young patients with early breast cancer. MATERIAL AND METHODS: We summarized six studies comparing OS between BCS + WBRT vs. mastectomy in young patients (≤40 years) with T1-T2 N0-N + M0 breast cancer. Primary endpoint was OS or distant metastasis free survival (DMFS). Only studies with fully adjusted Hazard Ratios (HR) were analyzed. Summary HRs were calculated through random effects models. We investigated publication bias and heterogeneity by means of sensitivity analyses and meta-regression models. RESULTS: Five population-based studies and a pooled study of two clinical trials, for a total of 22598 patients 40 years old or younger, were considered: 10898 patients underwent BCS and 11700 underwent mastectomy. After all the adjustments, including nodal status and tumor size, no difference in risk of death was found between the two groups (10% not significant risk reduction in patients who underwent BCS compared to mastectomy; summary HR = 0·90; 95%CI: 0·81 to 1·00). Between-study heterogeneity was not statistically significant (I(2) = 34% and Chi-square P = 0·15). Heterogeneity investigation did not find any variable influencing results. No indication for publication bias was found (P-value = 0·37). Excluding the only study presenting DMFS the results did not change (HR = 0·88; 95%CI: 0·78 to 1·01). CONCLUSION: Considering all the limitations, from the present meta-analysis carried out on 22598 patients it appears unlikely that mastectomy provides better OS compared to BCS + WBRT in early breast cancer patients aged 40 years or younger.
OBJECTIVES: Young age is an independent risk factor for local recurrence after breast conserving surgery (BCS) and whole breast radiotherapy (WBRT) for breast cancer. The aim of this study was to carry out a systematic meta-analysis to address the issue as to whether type of surgery might have an impact on overall survival (OS) of young patients with early breast cancer. MATERIAL AND METHODS: We summarized six studies comparing OS between BCS + WBRT vs. mastectomy in young patients (≤40 years) with T1-T2 N0-N + M0 breast cancer. Primary endpoint was OS or distant metastasis free survival (DMFS). Only studies with fully adjusted Hazard Ratios (HR) were analyzed. Summary HRs were calculated through random effects models. We investigated publication bias and heterogeneity by means of sensitivity analyses and meta-regression models. RESULTS: Five population-based studies and a pooled study of two clinical trials, for a total of 22598 patients 40 years old or younger, were considered: 10898 patients underwent BCS and 11700 underwent mastectomy. After all the adjustments, including nodal status and tumor size, no difference in risk of death was found between the two groups (10% not significant risk reduction in patients who underwent BCS compared to mastectomy; summary HR = 0·90; 95%CI: 0·81 to 1·00). Between-study heterogeneity was not statistically significant (I(2) = 34% and Chi-square P = 0·15). Heterogeneity investigation did not find any variable influencing results. No indication for publication bias was found (P-value = 0·37). Excluding the only study presenting DMFS the results did not change (HR = 0·88; 95%CI: 0·78 to 1·01). CONCLUSION: Considering all the limitations, from the present meta-analysis carried out on 22598 patients it appears unlikely that mastectomy provides better OS compared to BCS + WBRT in early breast cancerpatients aged 40 years or younger.
Authors: Alessandro Fancellu; Xue Yun Zhao; Pietrina Cottu; Valeria Sanna; Yuan Ping Li; Qin Zhu; Cinzia Tanda; Ying Yi Zhang; Yan Mei Lai; Giorgio Carlo Ginesu; Shu Qin Dai; Alberto Porcu Journal: Breast Care (Basel) Date: 2020-01-21 Impact factor: 2.860