Can Large PPI-Induced Gastric Polyps Actually Disappear?
They shrink rather than vanish. In this two-case report from a Japanese hospital, large fundic gland polyps that developed during more than 10 years of proton pump inhibitor therapy regressed to under 10 mm within 35 days of stopping the drug, and by that point they resembled ordinary sporadic fundic gland polyps. This is a case report of two patients, not a trial, so it describes what happened to these two people rather than what happens on average.
Dr. Kumar’s Take
Two patients is two patients, and I hold this loosely. But the timeline here is genuinely short: five weeks off the drug, and polyps that had been flagged for endoscopic removal no longer needed removing. In the first case the endoscopist started the resection, found the target polyp had shrunk below 10 mm, and stopped the procedure. That is a useful thing to know before you schedule someone for a polypectomy they may not need.
The second case matters for a different reason. That patient, a physician himself, agreed to weekly endoscopy with pathology after stopping his PPI, which is how the authors were able to watch the process rather than just the before and after. One week in, gastric juice acidity and viscosity had increased and nearly every large polyp surface showed erosion. The polyps were not simply fading. Something was actively changing on their surface as the stomach environment returned to its unsuppressed state.
What the Research Shows
This is a case report describing two patients with fundic gland polyps induced by long-term proton pump inhibitor use. The authors define fundic gland polyps larger than 10 mm as “large” fundic gland polyps.
Case 1 was a 63-year-old Japanese woman taking esomeprazole 20 mg daily for 10 years for gastroesophageal reflux disease, without Helicobacter pylori infection. Endoscopy found large fundic gland polyps in the gastric body. The largest measured 25 mm and had an irregular surface with reduced vascularity, which prompted a decision to resect it. She stopped esomeprazole the day after that endoscopy and was given no replacement medication for her reflux. Thirty-five days later, the resection was attempted and then abandoned because the target polyp had shrunk to under 10 mm.
Case 2 was a 60-year-old male physician on rabeprazole 10 mg daily for 12 years, whose large fundic gland polyps were found on screening endoscopy. He chose weekly endoscopy with pathological evaluation to track what happened after stopping the drug. One week after withdrawal, gastric juice acidity and viscosity had increased and erosion was visible on nearly all of the large polyp surfaces. By day 35, all of the large polyps had regressed and looked like sporadic fundic gland polyps.
Neither patient had fundic gland polyps before starting a PPI. Both were classified as non-poor metabolizers by cytochrome P450 2C19 phenotype.
How This Works (Biological Rationale)
The authors’ interpretation is that the shrinkage in polyp volume is tied to changes in the gastric environment after the drug is withdrawn, particularly the return of gastric acidity. The serial endoscopy in case 2 supports that reading: acidity and viscosity of the gastric juice rose within a week, and erosion appeared across nearly all of the large polyp surfaces at the same time. The polyps then regressed over the following weeks.
The authors are explicit that the underlying process has not been studied. Fundic gland polyps are a known consequence of long-term acid suppression, but exactly how they shrink once acid returns remains an open question, and this report is a description of the change rather than a mechanism worked out in the lab.
Results in Real Numbers
- Number of patients: 2
- Case 1: esomeprazole 20 mg daily for 10 years; largest polyp 25 mm; regressed to under 10 mm by day 35 after stopping
- Case 2: rabeprazole 10 mg daily for 12 years; all large polyps regressed by day 35 and resembled sporadic fundic gland polyps
- Definition used: fundic gland polyps larger than 10 mm were classed as “large”
- Week 1 findings in case 2: increased gastric juice acidity and viscosity, with erosion on nearly all large polyp surfaces
- Baseline: no fundic gland polyps present in either patient before PPI treatment began
Safety, Limits, and Caveats
Two patients cannot tell you how often this happens or how long it takes in general. Both had taken a PPI for over a decade, and both were non-poor cytochrome P450 2C19 metabolizers. Neither of those conditions applies to every patient on long-term acid suppression.
The polyps in these cases regressed to under 10 mm and came to resemble sporadic fundic gland polyps. That is shrinkage back toward a common, benign-appearing lesion, not clearance of the stomach. Case 1’s largest polyp had an irregular surface with reduced vascularity, which is exactly the kind of appearance that should send a polyp to endoscopic evaluation in the first place, and nothing here removes the need for that assessment. Not every gastric polyp in a PPI user is a PPI-induced fundic gland polyp.
Stopping a PPI is a clinical decision with its own consequences. Case 1’s original indication was gastroesophageal reflux disease, and she stopped without replacement therapy. That is a tradeoff to weigh with the prescribing physician, not a step to take because a polyp looked alarming on a report.
Practical Takeaways
- Large fundic gland polyps that appear during long-term PPI use may shrink substantially within about five weeks of stopping the drug.
- Before booking resection of a fundic gland polyp in a long-term PPI user, it is worth asking whether stopping the drug and rescoping is reasonable. In case 1, the planned resection became unnecessary.
- Repeat endoscopy is how you document the change. Both cases relied on serial endoscopic assessment.
- Regression here means shrinking to under 10 mm and resembling sporadic fundic gland polyps, so plan follow-up on that basis.
- Any decision to stop a PPI has to account for the condition it was prescribed for.
- Two cases are a starting point for a conversation with your gastroenterologist, not a protocol.
Related Studies and Research
- Fundic Gland Polyps: Should My Patient Stop Taking PPIs?
- Trends in Use of Proton Pump Inhibitors Among Adults in the United States
- Pharmacology of Proton Pump Inhibitors
- Acid Secretion and the H,K-ATPase of Stomach
- Episode 25: The Great GERD Mistake - How Medicine Made Heartburn Worse and How to Fix It
FAQs
How quickly did the polyps shrink?
In both cases, the large polyps had regressed by day 35 after the PPI was stopped. In case 2, changes in the stomach were already visible at one week: increased gastric juice acidity and viscosity, with erosion on nearly all of the large polyp surfaces.
Did the polyps disappear completely?
No. They regressed to under 10 mm and resembled sporadic fundic gland polyps, which is the common benign type.
Are all gastric polyps in PPI users caused by the drug?
No. Both patients here had no fundic gland polyps before starting a PPI and developed them after more than 10 years of treatment, which is what links the drug to the polyps in these two cases. A polyp found in a PPI user still needs proper endoscopic and pathological evaluation.
Is it safe to discontinue PPIs to treat polyps?
That depends on why the PPI was prescribed. Case 1 had been taking esomeprazole for gastroesophageal reflux disease and stopped without a replacement, a decision made with her physicians. This report does not establish that stopping is the right move for anyone else.
How large were the polyps in these cases?
The largest polyp in case 1 measured 25 mm. The authors classed any fundic gland polyp larger than 10 mm as a large one.
Bottom Line
In two patients on a proton pump inhibitor for more than a decade, large fundic gland polyps shrank to under 10 mm within 35 days of stopping the drug. One planned resection was called off mid-procedure because the polyp had already shrunk. This is a case report, so it shows that rapid regression is possible, not how commonly it happens, and the authors note the process behind it has not been studied.
