Clinical trial Recruiting at 1 site Interventional Ages 18 to 89

Hemorrhoidal artery embolization versus rubber band ligation for internal hemorrhoid bleeding

Official title: STRATOS: Single-center Randomized Controlled Trial of Rectal Arterial Embolization vs Band Ligation for the Treatment of Internal hemOrrhoidS

Run by University of California, Los Angeles · NCT07559630 · Data updated 2026-11-12

This trial will test whether hemorrhoidal artery embolization or rubber band ligation better stops bleeding and improves symptoms in adults with internal hemorrhoids.

Quick facts

Study typeInterventional
Ages18 Years to 89 Years
SexAll
Enrollment40 (estimated)
SponsorUniversity of California, Los Angeles
Academic / other
Locations1 site (Los Angeles, California)
StatusRecruiting
StartedMay 19, 2026
Main results expectedNovember 2030
Study endsNovember 2031
Registry record updatedJuly 10, 2026
Trial IDNCT07559630 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults aged 18–89 with chronic bleeding from Goligher grade II–III internal hemorrhoids who have failed conservative measures, can tolerate angiography and iodinated contrast (eGFR ≥45 mL/min), and can attend in-person follow-up at the UCLA site.

Probably not a fit

Patients unlikely to benefit include those with external-only hemorrhoids, portal hypertension or rectal varices, uncorrectable coagulopathy, significant arterial atherosclerosis preventing selective angiography, severe kidney impairment (eGFR <45 mL/min), allergy to iodinated contrast, active infection or malignancy, pregnancy, or recent nicotine use.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This single-center, open-label randomized trial will enroll 40 adults with Goligher grade II–III internal hemorrhoids and chronic bleeding who have failed conservative therapy and will randomize them 1:1 to hemorrhoidal artery embolization (HAE) or rubber band ligation (RBL). HAE is performed under conscious sedation using catheter-directed embolization of the feeding arteries, while RBL is performed by placing rubber bands at the hemorrhoid base; both are standard non-surgical treatments. Participants will have baseline exams and validated symptom and quality-of-life questionnaires and will be followed for up to 18 months with scheduled visits at 1 week, 1 month, 2 months, 3 months, 6 months and as-needed retreatment visits. Primary outcomes include control of bleeding and the number of procedures required for hemostasis, with secondary measures including pain scores and hemorrhoidal disease quality-of-life instruments.

Why it matters

Potential benefit: If successful, the trial could identify the better first-line non-surgical option to reduce bleeding, decrease need for repeat procedures, and improve quality of life for patients with internal hemorrhoids.

How similar studies have gone: Rubber band ligation is a long-established treatment for internal hemorrhoids, while HAE has shown promising results in observational series but lacks large randomized comparative data.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

1. Age ≥ 18 years and less than 90 years.
2. Ability to provide written informed consent.
3. Documented clinical history of chronic bleeding from internal hemorrhoids.
4. Documented presence of Goligher grade II-III internal hemorrhoids.
5. Failed conservative treatment for bleeding hemorrhoids (e.g. fiber supplementation, topical ointments and creams, dietary modifications, stool softeners, warm baths).
6. Able to comply with all treatments and protocol follow-up visits, in the opinion of the PI's.

Exclusion Criteria:

1. Moderate loss of kidney function, defined as estimated glomerular filtration rate of less than 45 mL/min.
2. Significant arterial atherosclerosis that would limit selective angiography.
3. Known alternative causes of GI bleeding.
4. Allergy to iodinated contrast agents.
5. Active infection or malignancy.
6. Pregnancy.
7. Active nicotine use within the last 12 months.
8. Portal hypertension/rectal varices.
9. Uncorrectable coagulopathy (INR \> 2; Platelet count \<100,000; PTT \> 40 sec).
10. Findings on baseline CTA that adversely affect treatment, based on PI's clinical judgment, including but not limited to stenosis, occlusion, or hypoplasia of the superior and/or middle rectal arteries.

Where it's running

  • Ronald Reagan UCLA Medical Center
    Los Angeles, California, United States
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

  • Hemorrhoid Artery Embolization (HAE) for Bleeding Internal Hemorrhoids: A Real-World Registry

    This registry collects real-world data to see if hemorrhoid artery embolization helps adults with symptomatic internal hemorrhoids that haven’t improved with standard care.

    Recruiting Joint & Vascular Institute · Libertyville, Illinois · NCT07635784

  • Long-term treatment with ADX-324 for people with hereditary angioedema

    This extension will try additional doses of ADX-324 (onvuzosiran) to see if continuing the drug is safe and helps people with Type I or II hereditary angioedema who finished the earlier Phase 3 trial.

    Recruiting at 3 sites Phase 3 ADARx Pharmaceuticals, Inc. · Litchfield Park, Arizona and 47 other locations · NCT07428499

  • Hemorrhoidal artery embolization to improve internal hemorrhoid symptoms

    This trial will try blocking enlarged hemorrhoidal arteries to reduce bleeding and other symptoms in adults with symptomatic internal hemorrhoids who cannot or will not have surgery.

    Recruiting University of California, Los Angeles · Los Angeles, California · NCT07179601

  • STOP-HAE: ADX-324 for hereditary angioedema

    This trial tests whether ADX-324 can reduce HAE attacks in adults with Type 1 or Type 2 hereditary angioedema.

    Recruiting at 52 sites Phase 3 ADARx Pharmaceuticals, Inc. · Litchfield Park, Arizona and 69 other locations · NCT06960213

  • Investigating the link between cough and hemorrhoids

    This study is trying to see if having a cough might be linked to developing hemorrhoids in patients visiting the hospital for this condition.

    Recruiting Muğla Sıtkı Koçman University · Muğla, Menteşe · NCT06878209

  • New device for treating hemorrhoids

    This study is testing a new device called PexyEazy® to see if it can safely and effectively treat grade II and III hemorrhoids in patients while making recovery easier and faster.

    Recruiting at 2 sites Developeration AB · Frölunda and 2 other locations · NCT05782010

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.