Accuracy and Sustainability of SCALE-EYE Evaluation for Measuring Reliable Polyp Size

Objective: This study aims to assess the diagnostic performance of SCALE-EYE in a screening and surveillance colonoscopy population. Also, sustainability of SCALE-EYE in terms of the reduction in colonoscopies, associated waste and carbon footprint is evaluated.

Study design: A multicenter, randomized, parallel group, endoscopist blinded study.

Study population: The unit of analysis is the colorectal polyp rather than the participants, approximately 289 colorectal polyps are planned to be included. Based on an expected detection rate of roughly 1.20 polyps per colonoscopy in the study population, approximately 241 participants aged 55-80 years old, who are referred for screening or surveillance colonoscopy at the participating study sites and have signed the informed consent form (ICF), will be included into the study. Polyps of all shapes (flat, sessile, pedunculated) that are found during colonoscopy and are smaller than 25 mm, as judged by the endoscopist using optical assessment, are considered eligible for inclusion.

Intervention: Participants will undergo the colonoscopy and once a colorectal polyp is identified, the polyp will first be measured by optical assessment by the endoscopist and then in a randomized order measured by biopsy-forceps assisted measurement and SCALE-EYE measurement.

Primary outcome measurement: The diagnostic performance of SCALE-EYE for polyp size categorization during real-time colonoscopy in comparison to polyp size categorization with biopsy-forceps assisted measurement (the reference standard). This will be measured by accuracy, sensitivity, and specificity of SCALE-EYE categorization compared to size measurement with the reference standard.

Secondary outcome measurements:

* The diagnostic performance of SCALE-EYE for polyp size categorization during real-time colonoscopy in comparison to optical assessment by endoscopists for polyp size measurement. * Sustainability (reduction of colonoscopies, the colonoscopy-associated waste and carbon footprint). * The learning curve, this will be evaluated by exploring the association between the number of measurements performed and the time needed for measurement and experienced difficulty. * The level of agreement between the endoscopist advised surveillance interval as based on SCALE-EYE, optical assessment, and the reference standard. * Safety, in terms of (serious) adverse events up to 30 days post-procedure.

• SCALE-EYE diagnostic performance versus optical assessment [Time frame: Immediately after the screening and/or surveillance colonoscopy]
• Sustainability [Time frame: After the screening and/or surveillance colonoscopy when the endoscopist advised surveillance interval is known (on average 30 days post-colonoscopy)]
• Learning curve [Time frame: Immediately after the screening and/or surveillance colonoscopy]
• Surveillance interval agreement [Time frame: After the screening and/or surveillance colonoscopy when the endoscopist advised surveillance interval is known (on average 30 days post-colonoscopy)]
• (Serious) adverse events [Time frame: Up to 30 days post-colonoscopy]