KLK3 and neoplasm: In their multivariate Cox proportional hazards analysis with Gleason grade, preoperative PSA level and tumour stage as co-variates, ErbB2-IR did not provide significant additive information (the Exp(B) value for positive ErbB2-IR [n>1400] compared to negative ErbB2-IR [n>300] was 0.91, 95% confidence interval 0.81–1.01, P = 0.099).