Stratifications on race and patients with estrogen receptor (ER)-positive tumors showed that these seven genes have a better prognostic value in Caucasian patients (P = 0.00368, Fig. 5 middle panel) as well as in Caucasian patients with ER-positive breast cancer (P = 0.00033, Fig. 5 right panel). Here, ESR1 is linked to breast carcinoma.