Molecular Fluorescence Endoscopy in Patients With Familial Adenomatous Polyposis, Using Bevacizumab-IRDye800CW

University Medical Center Groningen17 enrolled

Overview

There is a need for better visualization of polyps during surveillance endoscopy in patients with hereditary colon cancer syndromes like Familial Adenomatous Polyposis (FAP) and Lynch Syndrome (LS), to improve the adenoma detection rate. Optical molecular imaging of adenoma associated biomarkers is a promising technique to accommodate this need. The biomarker Vascular Endothelial Growth Factor (VEGF) is overexpressed in adenomatous colon tissue versus normal tissue and has proven to be a valid target for molecular imaging. The University Medical Center Groningen (UMCG) developed a fluorescent tracer by labeling the VEGF-targeting humanized monoclonal antibody bevacizumab, currently used in anti-cancer therapy, with the fluorescent dye IRDye800CW. The investigators hypothesize that when bevacizumab-IRDye800CW is administered to patients, it accumulates in VEGF expressing adenomas, enabling adenoma visualization using a newly developed near-infrared (NIR) fluorescence endoscopy platform (NL43407.042.13). This hypothesis will be tested in this feasibility study, next to the determination of the optimal tracer dose.

Study Type

INTERVENTIONAL

Allocation

NON_RANDOMIZED

Purpose

DIAGNOSTIC

Masking

NONE

Enrollment

Conditions

Adenomatous Polyposis Coli

Interventions

Eligibility

Sex: ALLMin age: 18 YearsMax age: 70 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Patients with genetically or clinically proven Familial Adenomatous Polyposis. Genetically proven: Adenomatous Polyposis Coli (APC)-mutation identified. Clinically proven: more than 100 colorectal polyps at diagnosis * Age 18 to 70 years * Written informed consent * Adequate potential for follow-up Exclusion Criteria: * Medical or psychiatric conditions that compromise the patient's ability to give informed consent * Proctocolectomy * MutYH mutation * Concurrent uncontrolled medical conditions * Pregnant or lactating women. Documentation of a negative pregnancy test must be available for woman of childbearing potential. Woman of childbearing potential are pre-menopausal women with intact reproductive organs and women less than two years after menopause.

Outcomes

Primary Outcomes

Number of fluorescent adenomatous polyps during surveillance endoscopy using the near-infrared fluorescence endoscopy platform in patients with Familial Adenomatous Polyposis (FAP), after administration of the fluorescent tracer bevacizumab-IRDye800CW.

The main objective of this study is to determine the sensitivity of the fluorescent tracer bevacizumab-IRDye800CW and the near-infrared fluorescence endoscopy platform in identifying adenomatous polyps during surveillance endoscopy in patients with Familial Adenomatous Polyposis (FAP).

Time frame: At surveillance endoscopy

Secondary Outcomes

Meassure the mean fluorescent intensity of the polyps during fluorescence endoscopy, resect the polyps and score VEGF intensity after immunohistochemistry for VEGF.

In this outcome meassure, it is determined if there is a correlation between the observed mean fluorescence intensity of a polyp and the VEGF expression in the same polyp, as determined with immunohistochemistry and eventually RNA/DNA analysis. In other words, does the mean fluorescence intensity reflect the VEGF expression of the polyp?

Time frame: Two years

Number of participants with Serious Adverse Events as a measure of safety and Tolerability.

Collection of safety data regarding administration of Bevacizumab-IRDye800CW (adverse events (AE), serious adverse events (SAE) and suspected unexpected serious adverse reactions (SUSAR)).

Time frame: Up to 1 week after administration

Measure the mean fluorescent intensity of adenomas and compare this between the three different dosing groups to determine the best tracer dose for the fluorescence endoscopy procedure.

The goal of this outcome measure, is to determine the optimal tracer dose (4.5, 10 or 25 mg) of bevacizumab-IRDye800CW for the molecular-guided fluorescence endoscopy procedure to visualize adenomas. The fluorescence intensity of adenomas will be measured in vivo during fluorescence endoscopy and ex vivo (e.g. using confocal fluorescence microscopy, spectroscopy). This will be compared between the three subgroups (patients with different time intervals between tracer injection and endoscopy procedure) to determine the best time interval between tracer injection and endoscopy procedure.