Stem Cells for Erectile Dysfunction Post RALP

This is a prospective, single-center, double blind, four-arm, pilot study to evaluate safety and effectiveness of allogeneic stem cells promoting the recovery of erectile function in patients undergoing radical retropubic prostatectomy (RALP) of localized prostate cancer. All participants will be assessed for eligibility Participants will be randomized in a 1:1:1:1 ratio to Arm 1, Arm 2, Arm 3 or Arm 4 using a validated system that automates the random assignment of participant numbers to randomization numbers. Study participants will be randomized to receive either: Arm 1 2.00x 10⁸ HB-adMSCCs locally injected into the corpora cavernosa of the penis and along the right and left neurovascular bundle of the penis in the OR at week 1 plus Placebo via IV in clinic at week 12. Arm 2 Placebo locally injected into the corpora cavernosa of the penis and along the right and left neurovascular bundle of the penis in the OR at week 1 plus 2.00x 10⁸ HB-adMSCs via IV in clinic at week 12. Arm 3 2.00x 10⁸ HB-adMSCs locally injected into the corpora cavernosa of the penis and along the right and left neurovascular bundle of the penis in the OR at week 1 plus 2.00x 10⁸ HB-adMSCs via IV in clinic at week 12. Arm 4 Placebo locally injected into the corpora cavernosa of the penis and along the right and left neurovascular bundle of the penis in the OR at week 1 plus Placebo via IV in clinic at week 12. Study Medication: 1. Stem cells locally injected in the penis: subjects will receive 1.00x 10⁸ HB-adMSCs injection into the corpora cavernosa of the penis and 5.0x10⁷ HB-adMSCs along the right neurovascular bundle and 5.0x10⁷ HB-adMSCs along the left neurovascular bundle during surgery in the Operating Room (OR) 2. Stem cells delivered intravenous: Subject will receive 2.00x10⁸ HB-adMSCs IV at the doctor's office. The treatment duration will be 2 cycles. Treatment will be administered on Week 1 (in the OR) and on week 12 in the Urology Clinic. The study duration will be 24 weeks post-surgery.