KLK3 and pulmonary artery enlargement: Ten patients entered statistical analysis and presented with significant LUTS improvement 12 months after PAE, as follows: mean IPSS reduction of 86.6% (2.8 vs. 20.7, − 17.9, P < 0.001), mean QoL reduction of 79.4% (1.1 vs. 5.4, − 4.3, P < 0.001), mean prostatic volume reduction of 38.4% (69.3 cm3 vs. 112.5 cm3, − 43.2 cm3, P < 0.001), mean peak urinary flow (Qmax) increase of 199.4% (19.9 mL/s vs. 6.6 mL/s, + 13.3 mL/s, P = 0.006) and mean PSA reduction of 50.1% (3.0 ng/mL vs. 6.1 ng/mL, − 3.0 ng/mL, P < 0.001).