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Computational and Mathematical Methods in Medicine
Volume 7, Issue 1, Pages 45-51

Effect of Allocated Radiotherapy after Breast Surgeries over Death Risk in Early Breast Cancer Patients: A Meta-Analysis

Department of Statistics and O.R., University of Jaén, Jaén, Spain

Received 26 April 2006

Copyright © 2006 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Meta-analysis is a widely used tool to synthesize the results of a set of primary studies leading to more powerful conclusions than those provided by isolated ones. To evaluate the effect of allocated radiotherapy, types of breast surgery and other risk factors over death risk in early breast cancer patients, we carried out a meta-analysis using logistic regression attending to the dichotomous character of the outcome.

Our findings suggest that the type of breast surgery is an effect modifier of the risk factors over death in early breast cancer patients. The effect of allocated radiotherapy is associated with a less risk of death only for patients who had mastectomy plus axillary sampling. The effect of a systemic treatment is not associated with death risk for patients who had breast conservation, on the contrary it is associated for those patients with mastectomy alone and with mastectomy with axillary clearance.