Published online May 28, 2023. doi: 10.3748/wjg.v29.i20.3185
Peer-review started: February 22, 2023
First decision: March 18, 2023
Revised: April 6, 2023
Accepted: April 18, 2023
Article in press: April 18, 2023
Published online: May 28, 2023
Processing time: 92 Days and 23.7 Hours
Irritable bowel syndrome (IBS) is the most prevalent gastrointestinal disorder in developed countries and reduces patients’ quality of life, hinders their ability to work, and increases health care costs. A growing number of trials have demonstrated an aberrant gut microbiota composition in IBS, also known as ‘gut dysbiosis’. Fecal microbiota transplantation (FMT) has been suggested as a treatment for IBS.
To assess the efficacy and safety of FMT for the treatment of IBS.
We searched Cochrane Central, MEDLINE, EMBASE and Web of Science up to 24 October 2022 for randomised controlled trials (RCTs) investigating the effectiveness of FMT compared to placebo (including autologous FMT) in treating IBS. The primary outcome was the number of patients with improvements of symptoms measured using a validated, global IBS symptoms score. Secondary outcomes were changes in quality-of-life scores, non-serious and serious adverse events. Risk ratios (RR) and corresponding 95%CI were calculated for dichotomous outcomes, as were the mean differences (MD) and 95%CI for continuous outcomes. The Cochrane risk of bias tool was used to assess the quality of the trials. GRADE criteria were used to assess the overall quality of the evidence.
Eight RCTs (484 participants) were included in the review. FMT resulted in no significant benefit in IBS symptoms three months after treatment compared to placebo (RR 1.19, 95%CI: 0.68-2.10). Adverse events were reported in 97 participants in the FMT group and in 45 participants in the placebo group (RR 1.17, 95%CI: 0.63-2.15). One serious adverse event occurred in the FMT group and two in the placebo group (RR 0.42, 95%CI: 0.07-2.60). Endoscopic FMT delivery resulted in a significant improvement in symptoms, while capsules did not. FMT did not improve the quality of life of IBS patients but, instead, appeared to reduce it, albeit non significantly (MD -6.30, 95%CI: -13.39-0.79). The overall quality of the evidence was low due to moderate-high inconsistency, the small number of patients in the studies, and imprecision.
We found insufficient evidence to support or refute the use of FMT for IBS. Larger trials are needed.
Core Tip: We did not find evidence to support the use of fecal microbiota transplantation (FMT) for irritable bowel syndrome (IBS) patients outside of clinical trials in this systematic review and meta-analysis. We report possible beneficial effects when FMT is delivered by endoscopy (colonoscopy or gastroscopy). FMT appears to be safe compared to placebo in patients with IBS, regardless of route of administration. Further randomised clinical trials are necessary to clarify the effect, if any, of FMT in IBS.