Serial endoscopy in azoxymethane treated mice using ultra-high resolution optical coherence tomography.

Abstract:

PURPOSE:Optical coherence tomography (OCT) is a minimally invasive, depth-resolved imaging tool that can be implemented in a small diameter endoscope for imaging mouse models of colorectal cancer (CRC). In this study, we utilized ultrahigh resolution (UHR) OCT to serially image the lower colon of azoxymethane (AOM) treated A/J mouse models of CRC in order to monitor the progression of neoplastic transformations and determine if OCT is capable of identifying early disease. EXPERIMENTAL DESIGN:Thirteen AOM treated A/J and two control A/J mice were surveyed at four timepoints (8, 14, 22 and 26 weeks post AOM treatment) using a 2.0 mm diameter UHR OCT endoscopic system with 3.2 microm axial and 4.4 microm lateral resolution. Histological samples obtained at the final timepoint served as the diagnostic reference. A blinded expert panel of mouse colon pathologists provided diagnoses from the OCT images based on criteria developed from a separate training set of OCT images. Panel results were compared to histological diagnoses assigned by a blinded pathologist. RESULTS:At the final imaging timepoint, 95% of adenomas and 23% of gastrointestinal neoplasias (38% protruding GINs and 9% non-protruding GINs) were correctly diagnosed. The panel identified 68% of disease foci (95% adenoma, 76% protruding GINs and 13% non-protruding GINs). Over the OCT imaging timepoints, disease progression followed a typical succession, with normal or GIN preceding adenoma. CONCLUSIONS:Endoscopic UHR OCT enabled accurate diagnosis of adenomas, identification of protruding GIN and non-destructive visualization of CRC progression, providing a tool for cancer research in animal models.

journal_name

Cancer Biol Ther

journal_title

Cancer biology & therapy

authors

Hariri LP,Qiu Z,Tumlinson AR,Besselsen DG,Gerner EW,Ignatenko NA,Povazay B,Hermann B,Sattmann H,McNally J,Unterhuber A,Drexler W,Barton JK

doi

10.4161/cbt.6.11.4852

subject

Has Abstract

pub_date

2007-11-01 00:00:00

pages

1753-62

issue

11

eissn

1538-4047

issn

1555-8576

pii

4852

journal_volume

6

pub_type

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