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Forest plot of adjusted hazard ratios (HRs) for the effect of intake of soy isoflavones on recurrence among postmenopausal patients with breast cancer, stratified by estrogen and progesterone receptor status and endocrine therapy. CI = confidence interval, ER = estrogen receptor, PR = progesterone receptor, Q1 to Q4 = quartiles according to intake of soy isoflavones, where Q1 is < 15.2 mg/day and Q4 is > 42.3 mg/day.
