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Kaplan-Meier analyses by intratumor heterogeneity of estrogen receptor (ER) and trial arm (four groups: low intratumor heterogeneity of ER/treated arm, low heterogeneity/untreated arm, high heterogeneity/treated arm, high heterogeneity/untreated arm). The P value is based on a two-sided log-rank test; numbers at risk are shown underneath each graph.
