Benign Prostatic Hyperplasia and Prostate Size Greater Than 90 Grams

This is a phase II, single center, prospective, single arm, investigational study to evaluate
the safety and efficacy of prostate artery embolization (PAE) for treatment of severe lower
urinary tract symptoms (LUTS) related to BPH in patients with prostate size greater than 90
grams that either refuse surgical treatment or are considered poor candidates for traditional
surgical therapy.

30 patients will be enrolled in the single treatment arm with follow-up for no less than 12
months.

The study will involve a screening period in which patient eligibility will be determined.
Once eligibility is confirmed, patients will receive PAE with Embosphere Microspheres within
4 weeks of screening and transrectal ultrasound. After treatment, patients will return for
follow-up visits at 1 month, 3 months, 6 months, and 12 months post PAE. At each of these
visits, patients will complete IPSS and IIEF questionnaires, undergo a physical exam, and
perform a medication review. Repeat TRUS and urodynamic testing will be performed at the 6
month and 12 month post PAE follow-up visit.

Inclusion Criteria:

- Patient is aged 50-85 years

- Patient has signed informed consent

- Patient has experienced lower urinary tract symptoms (LUTS) for at least 1 year prior
to study enrollment

- Patient has a prostate size larger than 90g as measured by transrectal ultrasound
(TRUS)

- Patient has an IPSS score greater than or equal to 13

- Patient has a peak urine flow rate < 12 mL/sec

- Patient either:

- Refuses surgical treatment

- Is considered high risk for surgical treatment

- Patient is either:

- Refractory to medical treatment

- Contraindicated for medical treatment

- Patient must meet ONE of the following criteria:

- Baseline PSA ≤ 2.5ng/mL

- Baseline PSA > 2.5 ng/mL and ≤ 10 ng/mL AND free PSA ≥ 25% of total PSA (no biopsy
required)

- Baseline PSA > 2.5 ng/mL and ≤ 10 ng/mL AND free PSA < 25% of total PSA AND negative
prostate biopsy result (minimum of 12 core biopsy) within 12 months

- Baseline PSA >10 ng/mL AND negative prostate biopsy result (minimum of 12 core biopsy)
within 12 months

Exclusion Criteria:

- History of prostate or bladder cancer, or currently being evaluated for cancer

- History of prostate or bladder cancer, or currently being evaluated for cancer

- Patient has taken alpha blockers within 4 weeks of screening

- Patient has experienced an irregular voiding pattern despite medical management with a
stable 5-alpha reductase inhibitor dosage for 3 months or longer

- History of open prostate surgery, radiofrequency, or microwave therapy

- Previous open bladder or rectosigmoid colon surgery

- TURP within the last two years

- Patient has nodularity or induration detected upon digital rectal examination (DRE)

- Neurogenic bladder or other neurological disorder impacting bladder function

- Urethral stricture, bladder neck contracture, other potentially confounding bladder
pathology, bladder disease, or confounding urethral pathology

- Acute urinary retention requiring an indwelling catheter

- Bladder atonia

- Active prostatitis or urinary tract infection

- Cystolithiasis within the past 3 months

- Serum creatinine >1.7mg/dL

- Coagulation disturbances not normalized by medical treatment

- Iodinated contrast allergy not controlled with 24-hour steroid preparation

- History of gelatin allergy

- History of pelvic irradiation

- History of severe peripheral vascular disease or known major iliac arterial occlusive
disease

- History of smoking greater than 30 pack-years

- Interest in future fertility

- Significant cardiac or respiratory disease that the Investigator believes puts the
patient at risk for a complication during the procedure

- Any other risks or factors that the Investigator believes puts the patient at risk for
a complication during the procedure