EPHB6 and prostate cancer: EphB6 was expressed in normal and prostate cancer tissue; however, its expression was significantly reduced in prostate cancer tissue compared with normal prostatic tissue (P<0.0001), in high volume (≥4 cm3) cancer compared with low volume (<4 cm3; P=0.015), and in pT3 stage compared with pT2 stage of the disease (P=0.0007).