PLXNB1 and breast cancer: Plexin-B1 level showed a significant positive correlation both with OS and DFS of Caucasian breast cancer patients (respectively, HRos = 0.56, 95%CI: 0.39–0.79, P = .001; HRdfs = 0.68, 95%CI = 0.51–0.90, P = .008)