A Drainage Tube Instead of a Stoma? What a 2026 Meta-Analysis Found for Rectal Cancer Surgery

When surgeons remove part of the rectum for cancer and join the two ends back together, that fresh surgical join needs protection while it heals. An anastomotic leak, where the join fails before it has healed, is one of the most serious complications of rectal surgery and can require emergency reoperation.

For decades the standard protection has been a diverting stoma: a temporary opening in the abdominal wall that routes waste away from the healing site so the bowel join can recover without the pressure and contamination of normal stool flow. It works, but it is not costless. The stoma brings its own complications. And it requires a second operation, weeks or months later, to reverse. That reversal surgery carries its own risks and its own recovery period.

A different approach has attracted growing interest: a transanal drainage tube placed through the anus to decompress the bowel from below, without creating an abdominal opening. A 2026 systematic review and meta-analysis set out to compare these two approaches head-to-head across the published evidence.

What the Review Did

Researchers at the Sixth Affiliated Hospital of South China University of Technology searched PubMed, EMBASE, Web of Science, and the Cochrane Library for all studies comparing a transanal drainage tube (TDT) to a diverting stoma (DS) in patients who had undergone anterior resection for rectal cancer. Seven studies met their inclusion criteria, covering a total of 1,347 participants. The analysis used a random-effects model and was reported in the Journal of Gastrointestinal Oncology in June 2026 (Zhang X et al., J Gastrointest Oncol, 2026).

The primary outcome was anastomotic leakage. Secondary outcomes included bowel obstruction, other postoperative complications, and length of hospital stay.

What the Analysis Found

On the primary question, anastomotic leakage: There was no statistically significant difference between the two groups. The pooled odds ratio for leakage in the TDT group versus the DS group was 0.73 (95% confidence interval: 0.42 to 1.29, P=0.28). The point estimate favours the tube slightly, but the confidence interval is wide and crosses 1.0, meaning the difference is not statistically reliable on leakage alone.

On bowel obstruction: Here the data were clearer. Patients who received a transanal drainage tube had a significantly lower incidence of postoperative bowel obstruction compared to those with a diverting stoma (OR 0.16, 95% CI 0.08 to 0.32, P<0.01). This is a large and statistically strong difference. Bowel obstruction is one of the more common complications of stoma formation, related to adhesions and altered anatomy around the stoma site, and is one of the drivers of post-stoma morbidity.

On everything else: Other complication rates and length of hospital stay were comparable between the two groups.

Why This Matters for Patients

The NHS notes that after anterior resection for bowel cancer a temporary stoma is sometimes created to protect the join while it heals, and that a second operation is later needed to close it. Both the stoma and its reversal carry their own risks and their own recovery periods (NHS: Bowel Cancer Surgery, NHS.UK). For patients, the prospect of two surgeries rather than one, combined with the practical and psychological demands of managing a stoma during the interval, is a significant part of the rectal cancer treatment experience.

What this meta-analysis suggests is that for selected patients, there may be a technically feasible alternative that matches the stoma's leakage protection while avoiding the stoma itself and its attendant complications. The reduction in bowel obstruction alone is a clinically meaningful finding.

The word "selected" carries real weight here. Not every patient undergoing anterior resection is a candidate for this approach. Tumour height, anastomotic tension, blood supply, sphincter anatomy, and patient factors all influence what is technically and safely possible. This is a decision made in the operating room and in the planning that precedes it, not a preference patients can simply request and receive.

How to Read These Numbers

Seven studies and 1,347 patients is a meaningful evidence base for a specific procedural question, but it is not a large foundation for confident conclusions. The confidence interval on the leakage result is wide, and the individual included studies are not named in the abstract. The methodological quality of the underlying trials matters for interpreting the pooled result, and the review's conclusion acknowledges that TDT is an option for "selected patients" rather than a universal alternative.

The bowel obstruction finding is more statistically robust and suggests a real benefit in that domain. The broader picture is that TDT does not appear inferior on the question that matters most (leakage) and has a clear advantage on a secondary complication that significantly affects patient recovery.

This is an evolving area, and the evidence supports surgical teams having this conversation with appropriate patients, rather than treating the diverting stoma as the only available option.

Sources

• Zhang X, Chen Z, Liang Z. "Transanal drainage tube versus diverting stoma for reducing anastomotic leakage after rectal cancer surgery: a systematic review and meta-analysis." Journal of Gastrointestinal Oncology. 2026 Jun 30. PubMed 42434276
• NHS. "Bowel cancer: Surgery." NHS.UK. NHS.UK