The purpose of the this international, multicenter, randomised, single-blind, parallel group, Phase III study is to demonstrate that a single transrectal ultrasound (TRUS)-guided intraprostatic injection of NX-1207 provides a long lasting therapeutic improvement of Lower Urinary Tract Symptoms (LUTS) associated with Benign Prostatic Hyperplasia (BPH) in patients not adequately controlled by medical therapy with α-blockers, as assessed by a change from baseline in the International Prostate Symptom Score (IPSS) total score.