Evaluating Acid Reflux After Oesophageal Stenting Using Anti-reflux Stents
Study Details
Study Description
Brief Summary
Incurable oesophageal cancer remains a global problem and in South Africa the vast majority of patients with oesophageal cancer have advanced disease at first presentation and are not curable. Likely the most distressing symptom of advanced cancer in the oesophagus is dysphagia, which is the inability to swallow solids and later also liquids. This is successfully addressed in most cases by the placement of a stent in the oesophagus which opens the area of obstruction. When placed in the lower oesophagus, one of the major drawbacks of these stents is that they disrupt the anti-reflux mechanism of the oesophago-gastric junction, which can result in severe acid reflux, severely impacting the quality of life of the patient. To address this problem, a range of approved anti-reflux stents have been developed and tested in numerous trials. To date, the evidence is conflicting and there is insufficient current evidence to support the routine use of these stents. However, the trials are not all similar in how the acid reflux was measured or what type of stent was used. Furthermore, the use of anti-reflux medication, such as proton pump inhibitors, which may help reduce reflux, are not standardised across the trials and make further conclusions about these stents difficult to interpret.
No data from Sub-Saharan Africa on the use of anti-reflux stents in these patients is available. South Africa faces a large burden of incurable oesophageal cancer and improving the quality of life of these patients is of paramount importance. This randomised controlled trial aims to investigate whether anti-reflux stents do indeed reduce acid reflux in patients with incurable oesophageal cancer compared to conventional oesophageal stents that do not have such an anti-reflux mechanism. Reflux will be measured using patient questionnaires about reflux, and other quality of life parameters, and will also be objectively measured using oesophageal scintigraphy, which has not been used in previous similar trials.
| Condition or Disease | Intervention/Treatment | Phase |
|---|---|---|
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N/A |
Detailed Description
Oesophageal cancer is an aggressive condition, resulting in the vast majority of patients having evidence of locally invasive, irresectable disease or distant metastases at the time of presentation. Overall survival remains poor. Management in the South African setting is plagued by late presentation of these patients, with less than 5% being eligible for curative treatment and median survival from the time of diagnosis being only 15 weeks, while those who present with complete obstruction having a median survival of only 75 days (10.7 weeks). Treatment of these patients in the South African setting remains predominantly palliative. The most common and debilitating symptom of advanced oesophageal malignancy is progressive dysphagia, which can be addressed by the endoscopic placement of self-expanding metal stents. The major drawback of stenting tumours in the lower oesophagus or oesophagogastric junction (OGJ), is the associated gastro-oesophageal reflux (GOR) resulting from the stent crossing the lower oesophageal sphincter and essentially negating the native anti-reflux mechanism. Significant reflux is the most common complaint worsening quality of life after stent placement in these patients and can be as high as 100% in some series. Prescribing routine proton pump inhibitors (PPIs) or placing stents with built-in anti-reflux mechanisms are methods aimed at reducing this symptomatic reflux.
Theoretically, oesophageal stents containing an anti-reflux valve should provide a physical barrier to prevent gastric content (which may be acidic or non-acidic) refluxing into the oesophagus, but whether this results in decreased rates of GOR in reality is somewhat controversial. To date, a number of trials have compared a range of anti-reflux oesophageal stents to conventional oesophageal stents and although there have been some conflicting results, a systematic review and meta-analysis in 2019 concludes that GOR is not significantly reduced by the use of anti-reflux stents. However, there are a number of factors that must be mentioned before this conclusion can be applied to dictate clinical practice. Firstly, the included trials all have reasonably small participant numbers, with 65 patients being the highest number of patients enrolled in any of these trials. In fact, the authors conclude that the meta-analysis is underpowered. Furthermore, the type of anti-reflux stent used varies with almost every trial and may well influence efficacy of reducing GOR. Anti-reflux medical therapy such as the use of proton pump inhibitors (PPIs) also varied greatly amongst the studies. Some prescribed PPIs only to the conventional stent group, others did not use PPIs in either group, while the rest did not mention whether PPIs were routinely given or not. This could possibly influence symptomatic reflux and act as a significant confounding factor.
The measurement of GOR in the trials assessed in this meta-analysis shows significant heterogeneity, with some studies using patient questionnaires (some of these assess quality of life in general and do not specifically focus on reflux symptoms), others use contrast oesophagography or functional 24-hour pH monitoring. These additional factors make the results of this underpowered meta-analysis difficult to interpret. Since then, a further randomised controlled trial (RCT) was conducted by Dua et al. This included a total of 60 patients, comparing a novel tricuspid-shaped valve anti-reflux stent (30 patients) to conventional stenting (30 patients). Importantly, this trial was a non-inferiority trial to assess safety and efficacy at improving dysphagia for the new stent. Assessment of GOR was a secondary outcome and although reflux rates favoured the new anti-reflux stent, this did not reach statistical significance. The current level I and II evidence on reducing GOR with anti-reflux stents is thus not definitive and leaves the topic unresolved.
While research in high income countries is focused on the management of early oesophageal malignancies, this is not appropriate in the South African setting where the vast majority of patients are irresectable at initial presentation. Local research is significantly limited and there is a paucity of data from South Africa, and Africa as a whole, as regards the palliative management of malignant oesophageal dysphagia. Specific evidence on the use of anti-reflux stents is absent. Further research is thus invaluable in assessing if the palliative care of these patients can be improved by using anti-reflux stents.
This prospective randomised controlled trial aims to compare the incidence of symptomatic volume GOR after the use of anti-reflux oesophageal covered metal stents versus conventional oesophageal covered metal stents for lower oesophageal malignant strictures in a South African tertiary referral centre with a high rate of palliative stenting for advanced oesophageal carcinoma. Reflux will be assessed subjectively by the administration of patient questionnaires aimed at identifying severity of acid reflux, but also the degree of dysphagia, pain and coughing before and after stent placement. Reflux will also be assessed objectively by using oesophageal scintigraphy performed shortly after stent insertion. Scintigraphy has not previously been used to measure GOR in these patients and is chosen for its accuracy and non-invasive nature (compared to, for example, pH monitoring which requires the placement of an uncomfortable nasal probe for 24 hours and is considered inappropriate in this cohort where the main focus lies on quality of life).
Study Design
Arms and Interventions
| Arm | Intervention/Treatment |
|---|---|
| Experimental: Anti-reflux Oesophageal Stent Group (AOSG) All patients randomised to this arm will receive an anti-reflux fully covered self-expanding metal oesophageal stent |
Device: Anti-reflux oesophageal stent
Fully covered self-expanding metal stent with anti-reflux mechanism
|
| Active Comparator: Conventional Oesophageal Stent Group (COSG) All patients randomised to this arm will receive a conventional fully covered self-expanding metal oesophageal stent that does not contain an anti-reflux mechanism |
Device: Conventional oesophageal stent
Fully covered self-expanding metal stent without an anti-reflux mechanism
|
Outcome Measures
Primary Outcome Measures
- Subjective gastro-oesophageal reflux (GOR) - change in GOR over specified time periods [Will be assessed pre-intervention and then at 1, 2, 4, and 8 weeks post intervention]
Self-reported symptomatic reflux using a validated reflux patient questionnaire - the GerdQ questionnaire. GerdQ: score ranges from 0 - 18 points with higher scores equating to higher GOR rates.
- Objective gastro-oesophageal reflux (GOR) [Will be performed as a once-off investigation on day 1 post stenting]
Objective measure of GOR will be done using oesophageal scintigraphy
Secondary Outcome Measures
- Dysphagia - change in dysphagia over specified time periods [Will be assessed pre-intervention and then at 1, 2, 4, and 8 weeks post intervention]
Dysphagia will be assessed pre- and post intervention using a validated 5 part dysphagia score described by Knyrim et al - scores are reported as 0 - 5, with higher scores indicating more severe dysphagia.
- Pain - Change in pain over specified time periods [Will be assessed pre-intervention and then at 1, 2, 4, and 8 weeks post intervention]
Pain will be assessed using a validated visual analog pain score using pictures of faces to signify pain. Pain will be rated from 0 - 5, with higher scores indicating more severe pain
- Cough - change in pain over specified time periods [Will be assessed pre-intervention and then at 1, 2, 4, and 8 weeks post intervention]
Cough will be assessed using a validated cough score, the Simplified Cough Score assessing both daytime and night-time cough severity. Score will range from 0 - 6, with higher score indicating worse cough symptoms.
- Stent-related complications [Documentation will occur at the time of stent insertion, day 1 post insertion and then at scheduled follow-ups at weeks 1, 2, 4 and 8 post-insertion or aat any time during the study period if a stent-related complication is reported]
All complications related to the stent insertion and later complications related to the stent will be documented
- Survival [Documented at 8 weeks post stent insertion]
Participant survival will be documented at the end of the study period
Eligibility Criteria
Criteria
Inclusion Criteria:
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Adult patients - 18 years of age or older
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Informed consent obtained from the patient after oral and written explanation of the trial
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Histologically confirmed malignancy of the distal oesophagus or OGJ
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Obstructive or irresectable malignancy due to metastases, local tumour infiltration or poor performance status
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Once deployed, the distal end of the stent must have crossed the OGJ junction and be lying within the proximal stomach
Exclusion Criteria:
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Patient declining or unable to give informed consent, including inability to speak or understand either English, Afrikaans or isiXhosa (the three most commonly spoken local languages).
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Patient unable to comply with the follow-up protocol of the trial (e.g. does not have a contactable telephone number)
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Oesophageal cancers selected for curative treatment or irresectable oesophageal cancers selected for palliative chemoradiation, but not requiring oesophageal stenting
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Benign oesophageal pathology or extrinsic compression of the oesophagus from another cause
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Patients with oesophageal cancers where the stent does not cross the OGJ
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Pregnant patients
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Patient performance status precluding any intervention or sedation
Contacts and Locations
Locations
| Site | City | State | Country | Postal Code | |
|---|---|---|---|---|---|
| 1 | University of Cape Town | Cape Town | Western Cape | South Africa | 7925 |
Sponsors and Collaborators
- University of Cape Town
Investigators
- Principal Investigator: Matthias F Scriba, FCS (SA), University of Cape Town
Study Documents (Full-Text)
More Information
Publications
- Blomberg J, Wenger U, Lagergren J, Arnelo U, Agustsson T, Johnsson E, Toth E, Lagergren P. Antireflux stent versus conventional stent in the palliation of distal esophageal cancer. A randomized, multicenter clinical trial. Scand J Gastroenterol. 2010;45(2):208-16. doi: 10.3109/00365520903443860.
- Blum D, Selman LE, Agupio G, Mashao T, Mmoledi K, Moll T, Dinat N, Gwyther L, Sebuyira LM, Ikin B, Downing J, Kaasa S, Higginson IJ, Harding R. Self-report measurement of pain & symptoms in palliative care patients: a comparison of verbal, visual and hand scoring methods in Sub-Saharan Africa. Health Qual Life Outcomes. 2014 Aug 2;12:118. doi: 10.1186/s12955-014-0118-z.
- Coron E, David G, Lecleire S, Jacques J, Le Sidaner A, Barrioz T, Coumaros D, Volteau C, Vedrenne B, Bichard P, Boustière C, Touchefeu Y, Brégeon J, Prat F, Le Rhun M; Société Française d'Endoscopie Digestive (SFED). Antireflux versus conventional self-expanding metallic Stents (SEMS) for distal esophageal cancer: results of a multicenter randomized trial. Endosc Int Open. 2016 Jun;4(6):E730-6. doi: 10.1055/s-0042-106960.
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- Dua KS, DeWitt JM, Kessler WR, Diehl DL, Draganov PV, Wagh MS, Kahaleh M, Wong Kee Song LM, Khara HS, Khan AH, Aburajab MM, Ballard D, Forsmark CE, Edmundowicz SA, Brauer BC, Tyberg A, Buttar NS, Adler DG. A phase III, multicenter, prospective, single-blinded, noninferiority, randomized controlled trial on the performance of a novel esophageal stent with an antireflux valve (with video). Gastrointest Endosc. 2019 Jul;90(1):64-74.e3. doi: 10.1016/j.gie.2019.01.013. Epub 2019 Jan 23.
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- Homs MY, Wahab PJ, Kuipers EJ, Steyerberg EW, Grool TA, Haringsma J, Siersema PD. Esophageal stents with antireflux valve for tumors of the distal esophagus and gastric cardia: a randomized trial. Gastrointest Endosc. 2004 Nov;60(5):695-702.
- Jones R, Junghard O, Dent J, Vakil N, Halling K, Wernersson B, Lind T. Development of the GerdQ, a tool for the diagnosis and management of gastro-oesophageal reflux disease in primary care. Aliment Pharmacol Ther. 2009 Nov 15;30(10):1030-8. doi: 10.1111/j.1365-2036.2009.04142.x. Epub 2009 Sep 8.
- Lai K. Chinese National Guidelines on Diagnosis and Management of Cough: consensus and controversy. J Thorac Dis. 2014 Oct;6(Suppl 7):S683-8. doi: 10.3978/j.issn.2072-1439.2014.10.06.
- Maurer AH, Parkman HP. Update on gastrointestinal scintigraphy. Semin Nucl Med. 2006 Apr;36(2):110-8. Review.
- Nel D, Omar M, Chinnery G, Jonas E. Disparity in oesophageal cancer management in South Africa: a comparison between two tertiary centres with special focus on the palliation of dysphagia. S Afr J Surg. 2019 Jun;57(2):10-15.
- Pandit S, Samant H, Morris J, Alexander SJ. Efficacy and safety of standard and anti-reflux self-expanding metal stent: A systematic review and meta-analysis of randomized controlled trials. World J Gastrointest Endosc. 2019 Apr 16;11(4):271-280. doi: 10.4253/wjge.v11.i4.271.
- Power C, Byrne PJ, Lim K, Ravi N, Moore J, Fitzgerald T, Keeling PW, Reynolds JV. Superiority of anti-reflux stent compared with conventional stents in the palliative management of patients with cancer of the lower esophagus and esophago-gastric junction: results of a randomized clinical trial. Dis Esophagus. 2007;20(6):466-70.
- Sabharwal T, Gulati MS, Fotiadis N, Dourado R, Botha A, Mason R, Adam A. Randomised comparison of the FerX Ella antireflux stent and the ultraflex stent: proton pump inhibitor combination for prevention of post-stent reflux in patients with esophageal carcinoma involving the esophago-gastric junction. J Gastroenterol Hepatol. 2008 May;23(5):723-8. doi: 10.1111/j.1440-1746.2008.05396.x.
- Shim CS, Jung IS, Cheon YK, Ryu CB, Hong SJ, Kim JO, Cho JY, Lee JS, Lee MS, Kim BS. Management of malignant stricture of the esophagogastric junction with a newly designed self-expanding metal stent with an antireflux mechanism. Endoscopy. 2005 Apr;37(4):335-9.
- HREC REF NO: 706/2021