Endoscopic Optical Coherence Tomography for Screening and Diagnosis of Colorectal Precancerous and Malignant Polyps

Washington University School of Medicine36 enrolled

Overview

Colorectal cancer arises from the mucosal layer of the colon. Current screening is performed by flexible endoscopy, which involves visual inspection of the mucosal lining of the colon and rectum with an optical camera mounted on the endoscope, with abnormal areas being biopsied. This method is somewhat limited in that there are no readily available surface pattern or morphological classification systems with adequate sensitivity or specificity to evaluate extent of submucosal invasion (deep, superficial, or none). Optical coherence tomography (OCT) using pattern recognition is a high-resolution imaging modality. There is currently an unmet need to predict depth of invasion for colonic tumors to decide on applicability of endoscopic (endoscopic submucosal dissection or endoscopic mucosal resection) vs. surgical therapy. The investigators' hypothesis is that OCT will have a higher diagnostic accuracy for determining depth of submucosal invasion compared to existing modalities. The investigators will first aim to assess the procedural feasibility and safety of using an OCT probe during routine colonoscopy with an early feasibility study. This study will identify appropriate modifications to the device and help with development of subsequent clinical study protocols. The eventual goal is to assess the diagnostic accuracy of OCT imaging for predicting depth of invasion of colonic tumors.

Study Type

INTERVENTIONAL

Allocation

Purpose

DIAGNOSTIC

Masking

NONE

Enrollment

Conditions

Colon Cancer

Outcomes

Primary Outcomes

Proportion of Participants Whose Procedure Length Using an OCT Probe During Routine Colonoscopy is Within 5 Minutes

If the proportion of the patients whose procedure length using an OCT probe during routine colonoscopy is within 5 minutes is greater than 75%, then the feasibility is defined in this study.

Time frame: Within 5 minutes during standard of care colonoscopy - Day 1 (average length 3:40 minutes (full range 1:54-8:20 minutes)

Secondary Outcomes

Number of Participants With Adverse Events Related to OCT Imaging During Routine Colonoscopy

The descriptions and grading scales found in the revised NCI Common Terminology Criteria for Adverse Events (CTCAE) version 5.0 will be utilized for all toxicity reporting.

Time frame: From start of colonoscopy through 48 hours after colonoscopy (estimated time of 3 days)

Number of Participants Who Have a Successfully Captured OCT Image Using Machine Learning Algorithm

Whether OCT image is successfully captured using machine learning algorithm, coded as "good" or "noisy".

Time frame: During colonoscopy (Day 1)

Cohen's Weighted Kappa Score

Overall agreement (OCT probe yielding results consistent with clinical pathology biopsy results) as measured by Cohen's Kappa. Overall Cohen's Kappa is a statistical measure for assessing the reliability of agreement between the two results by taking into account the element of chance. Cohen's kappa can range from 0 to 1 with 1 indicating perfect agreement and 0 indicating an agreement equivalent to chance. Clinical pathology is the gold standard for diagnosis. Diagnosis from both OCT and clinical pathology will be assigned as normal mucosa, hyperplastic polyp, tubular adenoma, sessile serrated adenoma, or colorectal cancer.