NCT05641844 · RedDress Ltd.
A Double Blind, Randomized Controlled Study, Evaluating the Safety and Efficacy of RD2 Ver.02 For the Management of Anal Fistulas
What this study is about
The goal of this clinical trial is to assesses the safety of autologous RD2 Ver.02 as compared to a control for managing transsphincteric and intersphinsteric anal fistulas. The main questions it aims to answer are: Assess the safety and effectiveness of RD2 Ver.02 in anal fistula application, compared to control. Complication rate by 6 months of anal fistula treatment with RD2 Ver.
View original scientific description
The goal of this clinical trial is to assesses the safety of autologous RD2 Ver.02 as compared to a control for managing transsphincteric and intersphinsteric anal fistulas. The main questions it aims to answer are: Assess the safety and efficacy of RD2 Ver.02 in anal fistula application, compared to control. Complication rate by 6 months of anal fistula treatment with RD2 Ver.02 compared to control. Recurrence of anal fistula at 12 months post-treatment Incidence of perirectal infection by 6 months in anal fistulas treated with RD2 Ver.02 compared to control. Patients will be randomized in to 2 arms. For all patients, blood will be drawn to ensure the blinding of the patients, the fistula will be evaluated and debrided, and then the internal fistula opening will be suture-closed, and a water leak test will be performed to ensure sealing. Following the water leak test, In the treatment arm, the patient's own coagulating blood will be applied into the entire fistula tract, allowing it to clot and serve as a provisional matrix inside the fistula tract. In the control arm, the blood sample will be discarded and saline will be applied to the fistula tract.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Subject is ≥18 years of age
- Subject has a transsphincteric or long intersphincteric anal fistula (\>1.5 cm), with a seton in place for a minimum of 1 month, deemed eligible for primary or repeat fistula repair by anorectal advancement flap or LIFT: Anterior, posterior or lateral fistula, first or recurrent, at any position circumferentially, with one external opening and one internal opening.
- Subjects is unable or unwilling to receive invasive surgical procedures, anorectal advancement flap or LIFT procedure, and is opting for minimally invasive technique of anal fistula management (i.e., fistula tract debridement and suturing of internal opening).
- 1.4 Prior to enrollment, during the preceding 3 months from Treatment Visit, subject must undergo a pelvic MRI to evaluate eligibility criteria unable to be assessed clinically.
- Female subjects who are capable of conceiving and all males capable of insemination must use an acceptable form of contraception in order to participate in the study and for 6 months following study procedure (acceptable forms of contraception include condoms for males and contraceptive pills or IUDs for women)
Exclusion criteria
- Subject who has a life expectancy of less than 24 months.
- Subjects who are cognitively impaired and have a healthcare proxy or those who are cognitively impaired and clearly do not understand the contents of the informed consent form.
- Cannot withdraw blood in the required amount (up to 15 mL).
- Women who are pregnant or currently breast feeding.
- Subject is currently receiving (i.e., within the past 30 days) or scheduled to receive systemic steroids (more than 10mg per day).
- Multiple fistula tracts, as confirmed on pelvic MRI
- Short fistula tract that in the surgeon's opinion are amenable to fistulotomy
- Active infection including perianal infection, and/or any active systemic or local infection.
- Presence of a perirectal abscess on pelvic MRI
- Presence of dominant luminal active Crohn's disease, validated by recent colonoscopy from preceding 12 months, requiring immediate therapy
- Rectal and/or anal stenosis and / or active proctitis, if this means a limitation for any surgical procedure.
- Known allergies or hypersensitivity to any of the following: antibiotics including but not limited to penicillin, streptomycin, gentamicin, aminoglycosides; Human Serum Albumin (HSA); Dulbecco Modified Eagle's Medium (DMEM); materials of bovine origin; local anaesthetics or gadolinium (MRI contrast); Known hypersensitivity to reagents and components of RD2 Ver.02 including calcium gluconate, Kaolin or citrate and ethylene oxide.
- Contraindication to MRI scan, (e.g., due to the presence of pacemakers, hip replacements, or severe claustrophobia).
- Known coagulation problems, abnormal thrombocytes level or if heparin is given intravenously. Subjects who are taking Coumadin, Aspirin, Plavix (Clopidogrel), Eliquis or Pradaxa will not be excluded.
- Patients with increased risk for the surgical procedure or major alteration of any of the following laboratory tests:
- Serum Creatinine levels \>1.5 times the upper limit of normality (ULN)
- Total bilirubin \>1.5 times the ULN (unless predominantly non conjugated due to documented history of Gilbert's syndrome)
- AST/ ALT \>3.0 times the ULN
- Hemoglobin \<10.0 g/dL
- Platelets \<150.0 x109/L
- Albuminemia \<3.0 g/dL.
- Patients who do not wish to or cannot comply with study procedures.
- Patients currently receiving or having received within 12 months prior to enrolment into this clinical study, any investigational drug.
- Subjects who need surgery in the perianal region for reasons other than fistulas at the time of inclusion in the study, or for whom such surgery is foreseen in this region in the 24 weeks after treatment administration.
- Contraindication to the anesthetic procedure.
- Subject with a diagnosis of Ulcerative Colitis
- Subject with malignancy, undergoing active treatment
- Rectovaginal fistula
- History of pelvic radiation
Where
- Los Angeles, California
- Weston, Florida
- Chicago, Illinois
- Indianapolis, Indiana
- Worcester, Massachusetts
- Rochester, Minnesota
- New York, New York
- Pittsburgh, Pennsylvania
- Providence, Rhode Island
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Nov 13, 2025 · Source of record for eligibility and locations