ROCHESTER, Minn. A dissolvable plug delivered stem cell therapy with few side effects in patients with single tractperianal fistulas,Mayo Clinicresearchers discovered. Perianal fistulas are painful tunnels between the intestine and the skin that often do not go away with standard medical or surgical care. People withCrohn's diseaseor otherinflammatory bowel conditionsare most at risk for this condition.
In a prospective, phase 1 clinical trial, researchers loaded stem cells from a patient's own fat tissue onto a bioabsorbable plug that was then surgically implanted to close the anal fistula tract. They followed the patients for one year and reported results of their early research inDiseases of the Colon & Rectum.
"In this early study, our team documented healing of single-tract fistulas," saysEric Dozois, M.D., a colorectal surgeon and first author on the study. "In my 20 years of clinical experience, our fistula research suggests we are getting closer to a care model."
As many as 26% of people with Crohn's disease will develop perianal fistulas. Most often, it starts with an infection within the anal gland and often progresses into an abscess that sometimes requires surgery. Left untreated, perianal fistulas leak fecal material and can lead to permanent colostomy and, in some cases, cancer. A colostomy is a surgical opening in the abdomen that bypasses the damaged colon to rid the body of solid waste. Perianal fistulas can cause quality-of-life challenges, such as the need to wear pads to protect clothing and prevent odor.
"Perianal fistulas are a complex medical condition that, even when repaired surgically, can reoccur, causing a lot of suffering for patients," saysWilliam Faubion Jr., M.D., a gastroenterologist and senior author on the study. "Our hope with this research is to advance a cell-based therapy toward daily clinical care that would be easy to implant in the operating room and offer a new option for patients with unmet needs."
The research
The research team extracted mesenchymal stem cells from adipose (fat) tissue of 20 patients with perianal fistulas who had not responded to standard medical or surgical treatment. Mesenchymal stem cells are adult stem cells with healing potential that have been well studied. After multiplying the stem cells in the lab, the team combined the cells with a plug created from a dissolvable material. They surgically implanted the plug to close the anal fistula tract then monitored the patients seven times within 12 months, with a focus on investigating safety. They also studied whether the treatment intervention led to clinical healing that could be confirmed through deep tissue imaging.
Dr. Dozois' team documented complete healing of 14 patients at six months and 13 patients at one year. Three patients withdrew for various reasons during the course of the clinical trial.
Four participants reported side effects such as infections that required admission to the hospital or surgical draining of an abscess. Twelve participants experienced reactions considered to be minor, such as redness, fever or nausea.
Based on their findings, Dr. Dozois' team is recommending further study of the stem cell-coated fistula plug with larger sample sizes and more types of fistulas. If all goes well, it could take two or three years before this procedure is approved for routine clinical care.
Dr. Dozois, Dr. Faubion and Mayo Clinic have financial interests in the regenerative fistula plug technology. Any profits Mayo Clinic realizes from its business ventures are reinvested in research and education initiatives at Mayo.
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About Mayo ClinicMayo Clinicis a nonprofit organization committed to innovation in clinical practice, education and research, and providing compassion, expertise and answers to everyone who needs healing. Visit theMayo Clinic News Networkfor additional Mayo Clinic news.
Diseases of the Colon & Rectum
Durable Response in Patients With Refractory Fistulizing Perianal Crohns Disease Using Autologous Mesenchymal Stem Cells on a Dissolvable Matrix: Results from the Phase I Stem Cell on Matrix Plug Trial
Dr. Dozois, Dr. Faubion and Mayo Clinic have financial interests in the regenerative fistula plug technology. Any profits Mayo Clinic realizes from its business ventures are reinvested in research and education initiatives at Mayo.
Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.
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