Abstract
EDITOR,—C C Chen and colleagues report convincing evidence for an association between life stress and breast cancer but suggest that it would be a formidable task to account for this association with a biologically plausible mechanism.1 Recent studies carried out by my group into the regulation of the synthesis of oestrogen in breast tumours from postmenopausal women have indicated a possible mechanism by which adverse life events could enhance this synthesis. Oestrogens are the …