SSTR2 and prostate cancer: Except for prostate cancer-specific survival (p = 0.5942, not shown) SSTR2 staining was inversely correlated with biochemical recurrence and metastasis-free survival: Respectively, PSA free survival (p = 0.0009, Figure 5A) and metastasis-free survival (p = 0.0452, Figure 5B) gradually declined from strong SSTR2 staining over medium and weak to negative.