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. 2003 Apr 1;88(7):1047–1053. doi: 10.1038/sj.bjc.6600847

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Copyright © 2003 Cancer Research UK

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Observational studies of women with breast cancer, comparing the breast cancer death rates between the BSE and non-BSE groups. A test for heterogeneity between the studies yielded a P-value of 0.41 for those studies based on women who practise BSE and a P-value of 0.26 for those based on finding cancer by BSE.