KLK3 and posterior cortical atrophy: In advanced recurrent PCa, [99mTc]Tc-PSMA-I&S scans (n = 46; mean PSA 101.3 ng/ml ± 242) were requested for monitoring of antihormonal therapy (n = 18), 177Lu-PSMA therapy (n = 13), chemotherapy (n = 8), and radiation therapy (n = 7).