Fig. 1

Kaplan Meier survival analyses for recurrence-free interval according to tamoxifen treatment in patients with a tumor with low or high Ki67 expression (cut-off at 5% expression level) (a, b) or low and high Ki67 expression (cut-off at 10% expression level) (c, d). The treatment-by-biomarker p interaction is 0.97 (5% cut off), or 0.52 (10% cut off)