An observational study in Polyps, Adenoma Colon and Colorectal Polyp, sponsored by University College, London. Completed at 1 site in United Kingdom. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2025-02-19.
Sponsored by University College, London · Observational
Background:
Colonoscopy is accepted to be the gold standard for screening of colorectal cancer (CRC). Most CRCs develop from adenomatous polyps, with colonoscopy accepted to be the gold standard for screening of CRC. An endoscopist's ability to detect polyps is assessed in the form of an Adenoma Detection Rate (ADR). Each 1.0% increase in ADR is associated with a 3.0% decrease in the risk of the patient developing an interval CRC. There remains a wide variation in endoscopist ADR.
More recently, the use of artificial intelligence (AI) and computer aided diagnosis in endoscopy has been gaining increasing attention for its role in automated lesion detection and characterisation. AI can potentially improve ADR, but previous AI related work has largely focused on retrospectively assessing still endoscopic images and selected video sequences which may be subject to bias and lack clinical utility. There are only limited clinical studies evaluating the effect of AI in improving ADR.
The CADDIE device uses convolutional neural networks developed for computer assisted detection and computer assisted diagnosis of polyps.
Primary objective: To determine whether the CADDIE artificial intelligence system improves endoscopic detection of adenomas during colonoscopy.
Primary endpoint: The difference in adenoma detection rate (ADR) between the intervention (supported with the CADDIE system) and non-intervention arm
Study design: Multi-Centre, open-label, randomised, prospective trial to assess efficacy and safety of the CADDIE artificial intelligence system for improving endoscopic detection of colonic polyps in real-time.
389 studies on the registry are indexed under Polyps; 59 are open to participants now.
This study's enrollment of 739 is above the median of 272 across 129 observational studies indexed under Polyps.
Browse Polyps studies →University College, London is the lead sponsor of 647 studies on the registry; 145 are open to participants now.
Of its 6 completed or terminated interventional studies of FDA-regulated products, 2 (33%) have results posted.
Counted across the registry records on this site, refreshed daily.
Study population will include patient's scheduled to undergo a surveillance or symptomatic colonoscopy at the participating sites.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Patients with a contraindication for biopsy or polypectomy. These include:
The endoscopist will be assisted with CADDIE system to detect polyps. The endoscopist will perform optical diagnosis of polyps with the assistance of the CADDIE's polyp characterisation function.
Device: CADDIE- Computer Aided (AI) Device used in Endoscopy
In addition to routine colonoscopy the endoscopist will perform optical diagnosis of detected polyps without the assistance of the CADDIE.
1. CADDIE assisted polyp detection 2. CADDIE assisted polyp characterisation
To Evaluate Whether Using the CADDIE System Improves Endoscopist Detection of Adenomas During Colonoscopy.
The difference in endoscopist ADR between the intervention (CADDIE system) and non-intervention arm.
Time frame: 30 days
Evaluate the Difference in Number of Adenomas Detected Per Colonoscopy Between Intervention and Non-intervention Arm
Compare the difference in the number of adenomas detected per colonoscopy between the intervention and non-intervention arm
Time frame: 30 days
To Determine Whether the CADDIE Artificial Intelligence System Improves Endoscopic Detection of All Polyps During Colonoscopy
Polyp Detection Rate (including proximal polyp detection rate) in the interventional group compared to the control group. \- Mean number of polyps detected per colonoscopy in the interventional group compared to the control group.
Time frame: 30 days
Compare the Accuracy of Endoscopist Optical Diagnosis of Diminutive Polyps When Using the CADDIE System (Intervention Arm) Compared to Without the CADDIE System (Control Arm)
Compare the accuracy of CADDIE against human endoscopist (high confidence diagnoses) for the optical diagnosis of diminutive polyps. Accuracy is defined as true positive and true negative divided by diagnoses total polyps that were optically diagnosed with high confidence.
Time frame: 30 days
Compare the Accuracy of Endoscopist Optical Diagnosis to Assign Colonoscopy Surveillance Intervals When Using the CADDIE System (Intervention Arm) Compared to Without the CADDIE System (Control Arm)
Compare the accuracy of using CADDIE's optical diagnosis to assign surveillance colonoscopy intervals against using human endoscopist optical diagnosis (high confidence diagnoses) for assigning surveillance colonoscopy intervals.
Time frame: 30 days
Compare the Accuracy of Endoscopist Optical Diagnosis of Diminutive Rectal Polyps When Using the CADDIE System (Intervention Arm) Compared to Without the CADDIE System (Control Arm)
Compare the accuracy of CADDIE against human endoscopist (high confidence diagnoses) for the optical diagnosis of diminutive rectal polyps.
Time frame: 30 days
Evaluate the Safety of the CADDIE by Recording Occurrence and Severity of Adverse Events.
Safety of the device will be assessed through monitoring of adverse events for 30 days' post-procedure. Adverse events are defined as: * Abdominal pain/discomfort. * Abdominal bloating. * Sedation related aspiration. * Bleeding risk. * Perforation. * Post polypectomy electrocoagulation syndrome. * Infection.
Time frame: 30 days
Assess Patient Anxiety During the Colonoscopy
Patient response to the question 'How anxious or calm were you during the colonoscopy?' assessed by Likert Scale with 5 options - 1 (Very anxious), 2 (Somewhat anxious), 3 (Neither Anxious nor calm), 4 (Somewhat calm), 5 (Very calm).
Time frame: 30 days
| Milestone | CADDIE | Standard Procedure |
|---|---|---|
| Started | 368 | 371 |
| Completed | 306 | 309 |
| Not completed | 62 | 62 |
The difference in endoscopist ADR between the intervention (CADDIE system) and non-intervention arm.
| ADR (% of participants) | CADDIE | Standard Procedure |
|---|---|---|
| To Evaluate Whether Using the CADDIE System Improves Endoscopist Detection of Adenomas During Colonoscopy. | 33.30 | 25.20 |
Compare the difference in the number of adenomas detected per colonoscopy between the intervention and non-intervention arm
| Adenomas per colonoscopy | CADDIE | Standard Procedure |
|---|---|---|
| Evaluate the Difference in Number of Adenomas Detected Per Colonoscopy Between Intervention and Non-intervention Arm | 0.66 ± 1.44 | 0.42 ± 0.98 |
Polyp Detection Rate (including proximal polyp detection rate) in the interventional group compared to the control group. \- Mean number of polyps detected per colonoscopy in the interventional group compared to the control group.
| PPC | CADDIE | Standard Procedure |
|---|---|---|
| To Determine Whether the CADDIE Artificial Intelligence System Improves Endoscopic Detection of All Polyps During Colonoscopy | 0.87 ± 1.59 | 0.63 ± 1.24 |
Compare the accuracy of CADDIE against human endoscopist (high confidence diagnoses) for the optical diagnosis of diminutive polyps. Accuracy is defined as true positive and true negative divided by diagnoses total polyps that were optically diagnosed with high confidence.
| % of adenomas correctly diagnosed | CADDIE | Standard Procedure |
|---|---|---|
| Compare the Accuracy of Endoscopist Optical Diagnosis of Diminutive Polyps When Using the CADDIE System (Intervention Arm) Compared to Without the CADDIE System (Control Arm) | 87.5 (77.6 to 94.1) | 76.7 (64.3 to 86.2) |
Compare the accuracy of using CADDIE's optical diagnosis to assign surveillance colonoscopy intervals against using human endoscopist optical diagnosis (high confidence diagnoses) for assigning surveillance colonoscopy intervals.
| % pts with correct surveillance interval | CADDIE | Standard Procedure |
|---|---|---|
| Compare the Accuracy of Endoscopist Optical Diagnosis to Assign Colonoscopy Surveillance Intervals When Using the CADDIE System (Intervention Arm) Compared to Without the CADDIE System (Control Arm) | 90.9 | 87.2 |
Compare the accuracy of CADDIE against human endoscopist (high confidence diagnoses) for the optical diagnosis of diminutive rectal polyps.
| % of adenomas correctly diagnosed | CADDIE | Standard Procedure |
|---|---|---|
| Compare the Accuracy of Endoscopist Optical Diagnosis of Diminutive Rectal Polyps When Using the CADDIE System (Intervention Arm) Compared to Without the CADDIE System (Control Arm) | 73.3 (44.9 to 92.2) | 53.3 (26.6 to 78.7) |
Safety of the device will be assessed through monitoring of adverse events for 30 days' post-procedure. Adverse events are defined as: * Abdominal pain/discomfort. * Abdominal bloating. * Sedation related aspiration. * Bleeding risk. * Perforation. * Post polypectomy electrocoagulation syndrome. * Infection.
| AE/SAE | CADDIE | Standard Procedure |
|---|---|---|
| Evaluate the Safety of the CADDIE by Recording Occurrence and Severity of Adverse Events. | 15 | 14 |
Patient response to the question 'How anxious or calm were you during the colonoscopy?' assessed by Likert Scale with 5 options - 1 (Very anxious), 2 (Somewhat anxious), 3 (Neither Anxious nor calm), 4 (Somewhat calm), 5 (Very calm).
| score on a scale | CADDIE | Standard Procedure |
|---|---|---|
| Assess Patient Anxiety During the Colonoscopy | 2.989 ± 1.193 | 3.061 ± 1.241 |
Collected over Adverse events were recorded for 30 days post-procedure. Non-serious events are listed at a 0% frequency threshold.
| Group | Deaths | Serious | Other |
|---|---|---|---|
| CADDIE | 2/368 (0.5%) | 5/368 (1.4%) | 10/368 (2.7%) |
| Standard Procedure | 0/371 (0%) | 1/371 (0.3%) | 13/371 (3.5%) |
| Event | CADDIE | Standard Procedure |
|---|---|---|
| Re-admission due to fall, mechnical injuryMusculoskeletal and connective tissue disorders | 1/368 | 1/371 |
| Operation unrelated to study design/study deviceSurgical and medical procedures | 1/368 | 0/371 |
| Gastrointestinal disorder unrelated to study deviceGastrointestinal disorders | 1/368 | 0/371 |
| Death due to underlying cardiovascular diseaseCardiac disorders | 1/368 | 0/371 |
| Death due to index diagnosis of malignancy unrelated to study design/ study deviceGeneral disorders | 1/368 | 0/371 |
| Event | CADDIE | Standard Procedure |
|---|---|---|
| Gastrointestinal disorder unrelated to study deviceGastrointestinal disorders | 2/368 | 7/371 |
| Shortness of BreathRespiratory, thoracic and mediastinal disorders | 2/368 | 1/371 |
| Mechanical Injury unrelated to study design/ study deviceMusculoskeletal and connective tissue disorders | 1/368 | 2/371 |
| New diagnosis Prostate cancerRenal and urinary disorders | 1/368 | 0/371 |
| HeadacheNervous system disorders | 1/368 | 0/371 |
| Electrolyte abnormalityInvestigations | 1/368 | 0/371 |
| DizzinessNervous system disorders | 1/368 | 0/371 |
| PyelonephritisRenal and urinary disorders | 1/368 | 0/371 |
| Irregular heart beatCardiac disorders | 0/368 | 1/371 |
| Facial painNervous system disorders | 0/368 | 1/371 |
| Age, Categorical(Participants) | CADDIE | Standard Procedure | Total |
|---|---|---|---|
| <=18 years | 0 | 0 | 0 |
| Between 18 and 65 years | 176 | 201 | 377 |
| >=65 years | 130 | 108 | 238 |
| Age, Continuous(years) | CADDIE | Standard Procedure | Total |
|---|---|---|---|
| Mean | 59.4 ± 14.7 | 58.0 ± 14.8 | 58.7 ± 14.7 |
| Sex: Female, Male(Participants) | CADDIE | Standard Procedure | Total |
|---|---|---|---|
| Female | 159 | 156 | 315 |
| Male | 147 | 153 | 300 |
| Race/Ethnicity, Customized(Participants) | CADDIE | Standard Procedure | Total |
|---|---|---|---|
| Ethnicity/Race — White British/Irish | 226 | 247 | 473 |
| Ethnicity/Race — White European | 21 | 16 | 37 |
| Ethnicity/Race — Mixed race | 3 | 2 | 5 |
| Ethnicity/Race — South East Asian | 24 | 11 | 35 |
| Ethnicity/Race — Asian Chinese | 3 | 2 | 5 |
| Ethnicity/Race — Asian Other | 6 | 3 | 9 |
| Ethnicity/Race — Black | 4 | 11 | 15 |
| Ethnicity/Race — Jewish | 1 | 1 | 2 |
| Ethnicity/Race — Arab | 5 | 6 | 11 |
| Ethnicity/Race — Other | 13 | 10 | 23 |
| Region of Enrollment(participants) | CADDIE | Standard Procedure | Total |
|---|---|---|---|
| United Kingdom | 306 | 309 | 615 |
Documents are hosted by the registry — open the source record to download them.
Plan to share: Yes — Patients will be asked informed consent with the possibility to share the data
Time frame: Data will be made available from 1 year after the trial findings are published. This is available for up to 5 years after study completion.
Access criteria: We will make provision for and consider data sharing requests from bona fide researchers who must abide by the following principles: data will be collected with an high level of quality assurance, data will be held securely with appropriate documentation, data will not be put into the public domain or otherwise shared without explicit ethical review or legal obligation, and they will aim to use any data generated to the maximum public good. These datasets are governed by data usage policies specified by the data controller (UCL). If a conflict exists that severely restricts the analyses that can be undertaken, we would endeavour to support outside researchers by hosting them as visiting workers in our team so that they can access the data. We are committed to complying with the Wellcome Trust Data Sharing Policy. Applications are subject to review by Prof Lovat and Rawen Kader and should be emailed to l.lovat@ucl.ac.uk
Ran from Apr 2021 to primary completion in Mar 2023, 22 months.
Results were first posted in Feb 2025, 1 year 11 months after primary completion.
Of 65 non-industry observational studies under Polyps, half reached primary completion within 16 months of starting (the median), counting those still running; a quarter within 11 and three quarters within 36. This study's 22 months is above that.
Counting every sponsor, half of 72 studies reached it within 18 months; a quarter within 11 and three quarters within 36.
How these figures are worked out, and which studies are left out of them.
This study is completed, as verified in Feb 2025. You cannot join it, but the record below documents what was studied.
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