Beral, Valerie; Bull, Diana; Doll, Richard; Peto, Richard; Reeves, Gillian K; Banks, Emily; La Vecchia, Carlo; Bain, Christopher; Gajalakshmi, V; Bergkvist, L; Yuan, J.M
Background The Collaborative Group on Hormonal Factors in Breast Cancer has brought together the worldwide epidemiological evidence on the possible relation between breast cancer and previous spontaneous and induced abortions. Methods Data on individual women from 53 studies undertaken in 16 countries with liberal abortion laws were checked and analysed centrally. Relative risks of breast cancer - comparing the effects of having had a pregnancy that ended as an abortion with those of never...[Show more]
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