KLK3 and cancer: The postoperative PSA velocity (PSAV) was low in the benign and TZ groups and high in the PZ and TZ+PZ groups (Table 1); PSAV in the benign group was similar to that in the TZ group (p = 0.767) and significantly higher than that in the PZ and TZ+PZ groups (both p < 0.05), indicating the significant existence of residual cancer in the PZ and TZ+PZ groups.