From Eric Kvaalen, Les Essarts-le-Roi, France
You say that some studies have suggested that soya milk may increase the risk of breast cancer (11 March, p 32). Research in mice shows that the drug tamoxifen was more effective if they had been fed soya phytoestrogen all their adult lives rather than starting after tumours had developed.
This may explain the finding that Asian women, who consume lots of soya, than that of Western women.
