Sclerotherapy With Polidocanol Foam In The Treatment Of Hemorrhoidal Disease In Patients With Bleeding Disorders

NCT ID: NCT04188171

Last Updated: 2020-08-19

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

Get a concise snapshot of the trial, including recruitment status, study phase, enrollment targets, and key timeline milestones.

Recruitment Status

UNKNOWN

Clinical Phase

PHASE2/PHASE3

Total Enrollment

150 participants

Study Classification

INTERVENTIONAL

Study Start Date

2018-08-01

Study Completion Date

2021-02-01

Brief Summary

Review the sponsor-provided synopsis that highlights what the study is about and why it is being conducted.

Treatment of hemorrhoidal disease includes a conservative approach (dietary and behavioral measures, venotropic and topical medication), office-based treatments and surgery. Rubber banding is currently considered the instrumental method of choice in the treatment of hemorrhoidal disease grades I to III (Goligher's classification). However, its use in patients with bleeding disorders is not recommended. Sclerotherapy can be performed in these patients since the hemorrhagic risk is very low. The most commonly used agent for sclerotherapy is liquid polidocanol. Polidocanol foam seems to be more effective than the liquid formulation and is safe in the treatment of hemorrhoidal disease even in patients with coagulation disorders. This study is aimed to evaluate the efficacy and safety of polidocanol foam sclerotherapy in the treatment of hemorrhoidal disease grades I to III in patients with bleeding disorders.

Detailed Description

Dive into the extended narrative that explains the scientific background, objectives, and procedures in greater depth.

Internal hemorrhoidal disease is classified according to the Goligher classification into grades I, II, III and IV according to its grade of prolapse and reducibility. The treatment of patients should be oriented by the presence of symptoms and the impact on life quality, aspects that are valued on the Sodergren scale.

The hemorrhoidal bleeding, usually mild, may be severe in patients under antithrombotic medications (antiplatelet or anticoagulant) as well as in patients with bleeding disorders non-induced by drugs. With the increase of life expectancy and the high prevalence of atrial fibrillation, the consumption of anticoagulants has also been increasing. Similarly, the use of antiplatelet medication has also increased, especially through its use in the primary and secondary prevention of cardiovascular events. Vitamin K antagonists and antiplatelet drugs are associated with an incidence of digestive bleeding between 1.5% - 4.5% with a short-term mortality of 10-15%. The relation between the use of new oral anticoagulants (NOACs) and digestive bleeding remains a matter of debate, with some studies showing different results when comparing bleeding risk with vitamin K antagonists. Similar to what happen with this subset of patients, those with inherited bleeding disorders are a known subgroup of patients predisposed to hemorrhagic complications. Hemophilia represents the main cause of inherited defects of clotting factors VIII and IX. With the advent of intravenous clotting factors concentrates, the perioperative mortality in this subgroup as decreased in the mid-20th century. However patients with this hematologic disease still have a higher risk of bleeding, delayed wound healing and postoperative infections. To the investigator's knowledge little is known about the prevalence of hemorrhoidal disease in patients with inherited bleeding disorders. Bearing in mind the high rate of surgical complications in these patients, they could represent the ideal candidates for less invasive office-based hemorrhoidal therapy. Instrumental, office-based treatment is reserved for internal hemorrhoidal disease grades I to III. Regardless of the applied technique, the goal is to decrease vascularization, decrease hemorrhoidal volume and increase the fixation of the fibrovascular pedicle to the rectal wall, thus treating the bleeding and hemorrhoidal prolapse. Rubber band ligation is considered the method of choice in the treatment of hemorrhoidal disease. However, its use is associated to bleeding rates after procedure ranging between 3.5 - 50% and late bleeding rates between 13% - 18,3% that may occur until 7-14 days after treatment. The hemorrhagic event is significant in 0.8% of cases and may even prove fatal. For this reason, this technique is contraindicated in patients with bleeding disorders. In patients on antithrombotic medication, discontinuation of this medication is recommended for 7 days before the ligation procedure and 7-10 days after the procedure, which substantially increases the risk of cardioembolic events. In contrast, sclerotherapy is a technique with a low rate of bleeding complications and can be used to treat hemorrhoidal disease grades I to III. After intravascular injection of sclerosing agent above the pectineal line - Blanchard technique - an inflammatory and fibrotic response is obtained that interrupts the blood supply. Although there are multiple sclerosing agents, in Portugal, the most frequently used is liquid polidocanol. As a nonionic detergent its use as a foam (obtained by the technique of Tessari which uses a device that combines two syringes and a three-way tap in which the polidocanol is mixed with air under mechanical force) appears to be associated with greater efficacy even with lower doses of sclerosing agent. Sclerotherapy with liquid polidocanol is effective in the treatment of grade I hemorrhoidal disease with a study demonstrating superiority of foam formulation in this grade of hemorrhoidal disease. A recently published Portuguese study sought to study the efficacy and safety of foamed polidocanol sclerotherapy in patients with grade I to IV hemorrhoidal disease. On the findings, which included 2000 participants, 210 of them on anticoagulant and/or dual antiplatelet therapy, the authors conclude that this instrumental procedure is effective and safe even in patients on antithrombotic therapy. However, no comparison was made between the incidence of complications occurred in this subgroup of patients with the remaining patients without antithrombotic therapy. As far as we know there are no published studies comparing polidocanol foam sclerotherapy to other ablative techniques.

The investigators are conducting a multicentric longitudinal prospective study including adult patients, with or without bleeding disorders, with hemorrhoidal disease grades I to III submitted to polidocanol foam sclerotherapy in three health institutions during an inclusion period of 1.5 years. Efficacy is assessed using Sodergren score of symptoms, bleeding and Goligher grades, and recurrence during follow-up. For the safety evaluation, complications are recorded. Efficacy and safety outcomes will be compared between two groups of patients: with bleeding disorders (Group A) and without bleeding disorders (Group B).

Conditions

See the medical conditions and disease areas that this research is targeting or investigating.

Hemorrhoids Bleeding Disorder

Study Design

Understand how the trial is structured, including allocation methods, masking strategies, primary purpose, and other design elements.

Allocation Method

NA

Intervention Model

SINGLE_GROUP

Longitudinal prospective study including adult patients, with or without bleeding disorders, with hemorrhoidal disease grades I to III submitted to polidocanol foam sclerotherapy in three health institutions during an inclusion period of 1.5 years. Efficacy and safety outcomes will be compared between two groups of patients: with bleeding disorders (Group A) and without bleeding disorders (Group B).
Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

Review each arm or cohort in the study, along with the interventions and objectives associated with them.

Polidocanol foam sclerotherapy

During the intervention period the participants are observed at 3-week intervals (maximum of 3 sessions).

The required number of polidocanol foam sclerotherapy sessions (maximum of 3) is determined by clinical and anoscopic evaluation (if the participant is non-symptomatic and/or there is no significant hemorrhoidal disease on anoscopy, the patient will not be a candidate for additional instrumental therapy moving directly to the follow-up period). After each session all patients were instructed to adopt dietary measures and adequate hydration maintaining therapy with systemic venotropic, topical and laxative if necessary.

After the intervention period, a one-year follow-up is scheduled with medical appointments performed every 3 months.

Group Type EXPERIMENTAL

Polidocanol foam sclerotherapy

Intervention Type PROCEDURE

* Preparation of the foam is done according to the Tessari technique (2 disposable 20ml syringe, a three-way tap, reusable extender adapted to intravenous needle).
* Sclerosant applied according to the Blanchard technique through a disposable transparent anoscope (patient in knee-chest position).
* In each session, treatment can be performed on more than one hemorrhoidal cushion. The maximum dose per treatment session is 20ml (mixture of 4ml of polidocanol 3% with 16ml of air).
* During the intervention period the participants are observed at 3-week intervals. The required number of sessions (maximum of 3) is determined by clinical and anoscopic evaluation.
* After the intervention period, a one-year follow-up is scheduled with medical appointments performed every 3 months.

Interventions

Learn about the drugs, procedures, or behavioral strategies being tested and how they are applied within this trial.

Polidocanol foam sclerotherapy

* Preparation of the foam is done according to the Tessari technique (2 disposable 20ml syringe, a three-way tap, reusable extender adapted to intravenous needle).
* Sclerosant applied according to the Blanchard technique through a disposable transparent anoscope (patient in knee-chest position).
* In each session, treatment can be performed on more than one hemorrhoidal cushion. The maximum dose per treatment session is 20ml (mixture of 4ml of polidocanol 3% with 16ml of air).
* During the intervention period the participants are observed at 3-week intervals. The required number of sessions (maximum of 3) is determined by clinical and anoscopic evaluation.
* After the intervention period, a one-year follow-up is scheduled with medical appointments performed every 3 months.

Intervention Type PROCEDURE

Eligibility Criteria

Check the participation requirements, including inclusion and exclusion rules, age limits, and whether healthy volunteers are accepted.

Inclusion Criteria

* Adult patients with symptomatic internal hemorrhoidal disease grades I to III submitted to sclerotherapy with polidocanol foam in three Portuguese health institutions (Centro Hospitalar Universitário do Porto, Hospital Senhora da Oliveira - Guimarães and Hospital Prof. Doutor Fernando da Fonseca, EPE - Amadora);
* Hemorrhoidal disease refractory to conservative therapy (dietary modification, intestinal transit modifiers, topical and venotropic drugs) during a period no less than 4 weeks;

Exclusion Criteria

* Known allergy to polidocanol;
* Liver cirrhosis;
* Pregnant or lactating women;
* Inflammatory bowel disease;
* Other concomitant symptomatic perianal disease;
* History of office-based or surgical treatment of hemorrhoidal disease in the last 6 months;
* Immunosuppression.
Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

Meet the organizations funding or collaborating on the study and learn about their roles.

Universidade do Porto

OTHER

Sponsor Role lead

Responsible Party

Identify the individual or organization who holds primary responsibility for the study information submitted to regulators.

Paulo Sérgio Durão Salgueiro

Principal Investigator

Responsibility Role PRINCIPAL_INVESTIGATOR

Principal Investigators

Learn about the lead researchers overseeing the trial and their institutional affiliations.

Paulo Salgueiro, MD

Role: PRINCIPAL_INVESTIGATOR

Centro Hospitalar Universitário do Porto

Locations

Explore where the study is taking place and check the recruitment status at each participating site.

Hospital Prof. Doutor Fernando da Fonseca, EPE

Amadora, , Portugal

Site Status

Hospital Senhora da Oliveira

Guimarães, , Portugal

Site Status

Centro Hospitalar Universitário do Porto

Porto, , Portugal

Site Status

Countries

Review the countries where the study has at least one active or historical site.

Portugal

References

Explore related publications, articles, or registry entries linked to this study.

Halverson A. Hemorrhoids. Clin Colon Rectal Surg. 2007 May;20(2):77-85. doi: 10.1055/s-2007-977485.

Reference Type RESULT
PMID: 20011381 (View on PubMed)

Agbo SP. Surgical management of hemorrhoids. J Surg Tech Case Rep. 2011 Jul;3(2):68-75. doi: 10.4103/2006-8808.92797.

Reference Type RESULT
PMID: 22413048 (View on PubMed)

Riss S, Weiser FA, Schwameis K, Riss T, Mittlbock M, Steiner G, Stift A. The prevalence of hemorrhoids in adults. Int J Colorectal Dis. 2012 Feb;27(2):215-20. doi: 10.1007/s00384-011-1316-3. Epub 2011 Sep 20.

Reference Type RESULT
PMID: 21932016 (View on PubMed)

Everhart JE, Ruhl CE. Burden of digestive diseases in the United States part II: lower gastrointestinal diseases. Gastroenterology. 2009 Mar;136(3):741-54. doi: 10.1053/j.gastro.2009.01.015. Epub 2009 Jan 21. No abstract available.

Reference Type RESULT
PMID: 19166855 (View on PubMed)

Johanson JF, Sonnenberg A. The prevalence of hemorrhoids and chronic constipation. An epidemiologic study. Gastroenterology. 1990 Feb;98(2):380-6. doi: 10.1016/0016-5085(90)90828-o.

Reference Type RESULT
PMID: 2295392 (View on PubMed)

Qureshi WA. Office management of hemorrhoids. Am J Gastroenterol. 2018 Jun;113(6):795-798. doi: 10.1038/s41395-018-0020-0. No abstract available.

Reference Type RESULT
PMID: 29487411 (View on PubMed)

Pucher PH, Qurashi M, Howell AM, Faiz O, Ziprin P, Darzi A, Sodergren MH. Development and validation of a symptom-based severity score for haemorrhoidal disease: the Sodergren score. Colorectal Dis. 2015 Jul;17(7):612-8. doi: 10.1111/codi.12903.

Reference Type RESULT
PMID: 25603811 (View on PubMed)

Pengo V, Pegoraro C, Cucchini U, Iliceto S. Worldwide management of oral anticoagulant therapy: the ISAM study. J Thromb Thrombolysis. 2006 Feb;21(1):73-7. doi: 10.1007/s11239-006-5580-y.

Reference Type RESULT
PMID: 16475046 (View on PubMed)

Yusuf S, Islam S, Chow CK, Rangarajan S, Dagenais G, Diaz R, Gupta R, Kelishadi R, Iqbal R, Avezum A, Kruger A, Kutty R, Lanas F, Lisheng L, Wei L, Lopez-Jaramillo P, Oguz A, Rahman O, Swidan H, Yusoff K, Zatonski W, Rosengren A, Teo KK; Prospective Urban Rural Epidemiology (PURE) Study Investigators. Use of secondary prevention drugs for cardiovascular disease in the community in high-income, middle-income, and low-income countries (the PURE Study): a prospective epidemiological survey. Lancet. 2011 Oct 1;378(9798):1231-43. doi: 10.1016/S0140-6736(11)61215-4. Epub 2011 Aug 26.

Reference Type RESULT
PMID: 21872920 (View on PubMed)

Sorensen R, Hansen ML, Abildstrom SZ, Hvelplund A, Andersson C, Jorgensen C, Madsen JK, Hansen PR, Kober L, Torp-Pedersen C, Gislason GH. Risk of bleeding in patients with acute myocardial infarction treated with different combinations of aspirin, clopidogrel, and vitamin K antagonists in Denmark: a retrospective analysis of nationwide registry data. Lancet. 2009 Dec 12;374(9706):1967-74. doi: 10.1016/S0140-6736(09)61751-7.

Reference Type RESULT
PMID: 20006130 (View on PubMed)

Rothberg MB, Celestin C, Fiore LD, Lawler E, Cook JR. Warfarin plus aspirin after myocardial infarction or the acute coronary syndrome: meta-analysis with estimates of risk and benefit. Ann Intern Med. 2005 Aug 16;143(4):241-50. doi: 10.7326/0003-4819-143-4-200508160-00005.

Reference Type RESULT
PMID: 16103468 (View on PubMed)

Holster IL, Valkhoff VE, Kuipers EJ, Tjwa ETTL. New oral anticoagulants increase risk for gastrointestinal bleeding: a systematic review and meta-analysis. Gastroenterology. 2013 Jul;145(1):105-112.e15. doi: 10.1053/j.gastro.2013.02.041. Epub 2013 Mar 5.

Reference Type RESULT
PMID: 23470618 (View on PubMed)

He Y, Wong IC, Li X, Anand S, Leung WK, Siu CW, Chan EW. The association between non-vitamin K antagonist oral anticoagulants and gastrointestinal bleeding: a meta-analysis of observational studies. Br J Clin Pharmacol. 2016 Jul;82(1):285-300. doi: 10.1111/bcp.12911. Epub 2016 Apr 15.

Reference Type RESULT
PMID: 26889922 (View on PubMed)

Pannach S, Goetze J, Marten S, Schreier T, Tittl L, Beyer-Westendorf J. Management and outcome of gastrointestinal bleeding in patients taking oral anticoagulants or antiplatelet drugs. J Gastroenterol. 2017 Dec;52(12):1211-1220. doi: 10.1007/s00535-017-1320-7. Epub 2017 Feb 16.

Reference Type RESULT
PMID: 28210867 (View on PubMed)

Craddock CG Jr, Fenninger LD, Simmons B. Hemophilia: Problem of Surgical Intervention for Accompanying Diseases. Review of the Literature and Report of a Case. Ann Surg. 1948 Nov;128(5):888-903. doi: 10.1097/00000658-194811000-00002. No abstract available.

Reference Type RESULT
PMID: 17859247 (View on PubMed)

Ingerslev J, Hvid I. Surgery in hemophilia. The general view: patient selection, timing, and preoperative assessment. Semin Hematol. 2006 Jan;43(1 Suppl 1):S23-6. doi: 10.1053/j.seminhematol.2005.11.024.

Reference Type RESULT
PMID: 16427380 (View on PubMed)

Cocorullo G, Tutino R, Falco N, Licari L, Orlando G, Fontana T, Raspanti C, Salamone G, Scerrino G, Gallo G, Trompetto M, Gulotta G. The non-surgical management for hemorrhoidal disease. A systematic review. G Chir. 2017 Jan-Feb;38(1):5-14. doi: 10.11138/gchir/2017.38.1.005.

Reference Type RESULT
PMID: 28460197 (View on PubMed)

Cataldo P, Ellis CN, Gregorcyk S, Hyman N, Buie WD, Church J, Cohen J, Fleshner P, Kilkenny J 3rd, Ko C, Levien D, Nelson R, Newstead G, Orsay C, Perry WB, Rakinic J, Shellito P, Strong S, Ternent C, Tjandra J, Whiteford M; Standards Practice Task Force, The American Society of Colon and Rectal Surgeons, USA. Practice parameters for the management of hemorrhoids (revised). Dis Colon Rectum. 2005 Feb;48(2):189-94. doi: 10.1007/s10350-004-0921-4. No abstract available.

Reference Type RESULT
PMID: 15711856 (View on PubMed)

Davis BR, Lee-Kong SA, Migaly J, Feingold DL, Steele SR. The American Society of Colon and Rectal Surgeons Clinical Practice Guidelines for the Management of Hemorrhoids. Dis Colon Rectum. 2018 Mar;61(3):284-292. doi: 10.1097/DCR.0000000000001030. No abstract available.

Reference Type RESULT
PMID: 29420423 (View on PubMed)

Albuquerque A. Rubber band ligation of hemorrhoids: A guide for complications. World J Gastrointest Surg. 2016 Sep 27;8(9):614-620. doi: 10.4240/wjgs.v8.i9.614.

Reference Type RESULT
PMID: 27721924 (View on PubMed)

Nelson RS, Ewing BM, Ternent C, Shashidharan M, Blatchford GJ, Thorson AG. Risk of late bleeding following hemorrhoidal banding in patients on antithrombotic prophylaxis. Am J Surg. 2008 Dec;196(6):994-9; discussion 999. doi: 10.1016/j.amjsurg.2008.07.036.

Reference Type RESULT
PMID: 19095121 (View on PubMed)

Kim M, Song HJ, Kim S, Cho YK, Kim HU, Song BC, Chang WY, Kim SH. Massive life-threatening lower gastrointestinal hemorrhage caused by an internal hemorrhoid in a patient receiving antiplatelet therapy: a case report. Korean J Gastroenterol. 2012 Oct;60(4):253-7. doi: 10.4166/kjg.2012.60.4.253.

Reference Type RESULT
PMID: 23089912 (View on PubMed)

Odelowo OO, Mekasha G, Johnson MA. Massive life-threatening lower gastrointestinal hemorrhage following hemorrhoidal rubber band ligation. J Natl Med Assoc. 2002 Dec;94(12):1089-92.

Reference Type RESULT
PMID: 12510709 (View on PubMed)

Patel S, Shahzad G, Rizvon K, Subramani K, Viswanathan P, Mustacchia P. Rectal ulcers and massive bleeding after hemorrhoidal band ligation while on aspirin. World J Clin Cases. 2014 Apr 16;2(4):86-9. doi: 10.12998/wjcc.v2.i4.86.

Reference Type RESULT
PMID: 24749117 (View on PubMed)

Madoff RD, Fleshman JW; Clinical Practice Committee, American Gastroenterological Association. American Gastroenterological Association technical review on the diagnosis and treatment of hemorrhoids. Gastroenterology. 2004 May;126(5):1463-73. doi: 10.1053/j.gastro.2004.03.008. No abstract available.

Reference Type RESULT
PMID: 15131807 (View on PubMed)

Forlini A, Manzelli A, Quaresima S, Forlini M. Long-term result after rubber band ligation for haemorrhoids. Int J Colorectal Dis. 2009 Sep;24(9):1007-10. doi: 10.1007/s00384-009-0698-y. Epub 2009 Apr 23.

Reference Type RESULT
PMID: 19387663 (View on PubMed)

Atallah S, Maharaja GK, Martin-Perez B, Burke JP, Albert MR, Larach SW. Transanal hemorrhoidal dearterialization (THD): a safe procedure for the anticoagulated patient? Tech Coloproctol. 2016 Jul;20(7):461-6. doi: 10.1007/s10151-016-1481-z. Epub 2016 May 12.

Reference Type RESULT
PMID: 27170327 (View on PubMed)

Sneider EB, Maykel JA. Diagnosis and management of symptomatic hemorrhoids. Surg Clin North Am. 2010 Feb;90(1):17-32, Table of Contents. doi: 10.1016/j.suc.2009.10.005.

Reference Type RESULT
PMID: 20109630 (View on PubMed)

Acheson AG, Scholefield JH. Management of haemorrhoids. BMJ. 2008 Feb 16;336(7640):380-3. doi: 10.1136/bmj.39465.674745.80. No abstract available.

Reference Type RESULT
PMID: 18276714 (View on PubMed)

ASGE Technology Committee; Siddiqui UD, Barth BA, Banerjee S, Bhat YM, Chauhan SS, Gottlieb KT, Konda V, Maple JT, Murad FM, Pfau P, Pleskow D, Tokar JL, Wang A, Rodriguez SA. Devices for the endoscopic treatment of hemorrhoids. Gastrointest Endosc. 2014 Jan;79(1):8-14. doi: 10.1016/j.gie.2013.07.021. Epub 2013 Nov 14.

Reference Type RESULT
PMID: 24239254 (View on PubMed)

Tessari L, Cavezzi A, Frullini A. Preliminary experience with a new sclerosing foam in the treatment of varicose veins. Dermatol Surg. 2001 Jan;27(1):58-60.

Reference Type RESULT
PMID: 11231246 (View on PubMed)

Cavezzi A, Tessari L. Foam sclerotherapy techniques: different gases and methods of preparation, catheter versus direct injection. Phlebology. 2009 Dec;24(6):247-51. doi: 10.1258/phleb.2009.009061.

Reference Type RESULT
PMID: 19952380 (View on PubMed)

Nastasa V, Samaras K, Ampatzidis Ch, Karapantsios TD, Trelles MA, Moreno-Moraga J, Smarandache A, Pascu ML. Properties of polidocanol foam in view of its use in sclerotherapy. Int J Pharm. 2015 Jan 30;478(2):588-96. doi: 10.1016/j.ijpharm.2014.11.056. Epub 2014 Nov 26.

Reference Type RESULT
PMID: 25433198 (View on PubMed)

Yuksel BC, Armagan H, Berkem H, Yildiz Y, Ozel H, Hengirmen S. Conservative management of hemorrhoids: a comparison of venotonic flavonoid micronized purified flavonoid fraction (MPFF) and sclerotherapy. Surg Today. 2008;38(2):123-9. doi: 10.1007/s00595-007-3582-9. Epub 2008 Feb 1.

Reference Type RESULT
PMID: 18239868 (View on PubMed)

Moser KH, Mosch C, Walgenbach M, Bussen DG, Kirsch J, Joos AK, Gliem P, Sauerland S. Efficacy and safety of sclerotherapy with polidocanol foam in comparison with fluid sclerosant in the treatment of first-grade haemorrhoidal disease: a randomised, controlled, single-blind, multicentre trial. Int J Colorectal Dis. 2013 Oct;28(10):1439-47. doi: 10.1007/s00384-013-1729-2. Epub 2013 Jun 18.

Reference Type RESULT
PMID: 23775099 (View on PubMed)

Fernandes V, Fonseca J. Polidocanol Foam Injected at High Doses with Intravenous Needle: The (Almost) Perfect Treatment of Symptomatic Internal Hemorrhoids. GE Port J Gastroenterol. 2019 May;26(3):169-175. doi: 10.1159/000492202. Epub 2018 Aug 31.

Reference Type RESULT
PMID: 31192285 (View on PubMed)

Other Identifiers

Review additional registry numbers or institutional identifiers associated with this trial.

12422301

Identifier Type: -

Identifier Source: org_study_id

More Related Trials

Additional clinical trials that may be relevant based on similarity analysis.