effectiveness and safety of adipose-derived regenerative cells for reduction of risk of bladder neck contracture

Conditions: Bladder Neck Obstruction; Bladder Outlet Obstruction; Benign Prostatic Hyperplasia; Urinary Bladder Neck Obstruction

Summary: autologous adipose-derived regenerative cells (adrc) will be extracted from lipoaspirate by enzymatic digestion from a portion of the fat harvested from the patient's front abdominal wall. transurethral bladder neck resection followed by the injection of adrcs suspension will be performed. this is a single arm study with no control. all patients receive cell therapy.

fat tissue obtainment: subjects will undergo liposuction under local anesthesia. in this procedure, ringer's solution with the anesthetic lidocaine and vasoconstrictor adrenaline infused into the adipose compartment to minimize blood loss and contamination of the tissue by peripheral blood cells. 15 minutes later a hollow blunt-tipped 3 mm cannula introduced into the subcutaneous space through small (0.5 cm) incision. the cannula attached to syringe and under gentle suction moved through the adipose compartment, mechanically disrupting the fat tissue. aspirate volume - approximately 150-200 cc. procedure time - 30 minutes. adrc isolation: harvested adipose tissue will be processed according to patent pending technology based on enzymatic digestion, washing and concentration of cell pellet in 9.5 ml of normal saline.obtained adrc divided into 2 portions. first portion (0.5 ml) used for counting, viability and sterility assessment. the second portion (9 ml) placed into sterile syringe for injection. surgery: transurethral endoscopic loop resection of bladder neck will be performed. autologous adrc administration: injection of adrc suspension will be performed immediately after bladder neck resection. 9 to 18 injections (0.5 to 1.0 ml each) will be injected with endoscopic needle into the bladder neck close to the site of resection. all injections will be performed during single procedure.

Eligibility criteria:
inclusion criteria: * bladder neck contracture after transurethral prostate resection. * obstructive pattern of urine flow rate with maximum flow rate below 15 ml/s * patient is familiar with participant information sheet * patient signed informed consent form non-inclusion criteria: * contraindications for spinal, epidural or inhalation anesthesia * urethral strictures * genitourinary inflammatory diseases * prostate-specific antigen (psa) level above 4 ng/ml * contraindications for local anesthesia or history of allergy for local anesthetics * systemic glucocorticoid and/or immunosuppressant therapy * any condition that might limit compliance (dementia, mental disorders, narcotic drug or alcohol abuse etc.) * participation in other clinical trials (or administration of investigational drugs) during 3 months prior inclusion * patients with malignant tumors including postoperative period, patients receiving chemotherapy and/or radiotherapy * clinically significant abnormalities in results of laboratory tests * patient received anticoagulants at least 12 hours prior the liposuction * medical history of heterotopic ossifications * patients prescribed for glycoprotein inhibitors treatment exclusion criteria: * patient's refusal from the further participation in trial * chronic kidney disease iv- v stages (creatinine clearance \< 30 ml/min estimated by cockcroft-gault formula) * confirmed syphilis, hiv, hepatitis b or c infections

Keywords: bladder neck obstruction bladder outlet obstruction benign prostatic hyperplasia urinary bladder neck obstruction bladder neck contracture bladder neck stricture bladder neck stenosis transurethral resection of the prostate prostatectomy stromal vascular fraction (svf) adipose-derived regenerative cells (adrc) adipose tissue stem cells