did not reach statistical significanceP = 0.0043
Although our data, in general, did not reach statistical significance, it can be deduced that high BRK expression was significantly associated with poor RFS in tamoxifen-treatment patients ( n = 161; P = 0.0043; Additional file 2 : Figure S3G), thus strengthening the rationale for ER/BRK co-targeting in ER-positive breast cancers.