Confocal Endoscopic Microscopy for Detection of Early Stage Gastric Cancer in Subjects With Hereditary Diffuse Gastric Cancer Syndrome

Phase 2

Completed

Conditions: Gastric Neoplasms
Gastric Cancer

Interventions: Device: Endoscope+Cellvizio(R) 100 microscope

Registration Number: NCT03648879

Lead Sponsor: National Cancer Institute (NCI)

Brief Summary: Background:

People with hereditary gastric cancer syndrome are at increased risk of getting cancer in their stomach. These people should have regular endoscopies and biopsies to check for cancer if they are choosing to keep their stomach. Researchers want to see if they can improve the detection of cancer by endoscopy. Improved endoscopies could better detect early signs of cancer in people with this syndrome.

Objective:

To see if a small microscope attached to an endoscope to inspect the stomach lining is better than regular endoscopy to find the first signs of cancer in the stomach.

Eligibility:

People ages 18 and older who have a personal or family history of a hereditary gastric cancer syndrome or have a mutation that is known to lead to gastric cancer

Design:

Participants will be screened over the phone or in person with:

* Personal and family medical history

* Review of their medical records

Participants will have a physical exam. Then they will be put under general anesthesia. They will have an endoscopy. A lighted tube will be inserted into the mouth and go down to the stomach. First, the standard device will be used. Then participants will be injected with fluorescein. This is a contrast agent. Then the microscope will be added to the tube and the endoscopic evaluation of the stomach will be repeated. During the procedure, biopsies will be taken from different areas of the stomach. Participants will be observed for a few hours after the procedure.

About 14 days after the endoscopy, participants will be asked to return to the clinic for a follow-up visit. This visit can also be conducted over the phone.

Detailed Description: Background:

Hereditary Diffuse Gastric Cancer (HDGC) syndrome is caused by a germline mutation in the Cadherin 1 (CDH1) gene. Carriers of this mutation have a 56-70% lifetime risk of developing gastric adenocarcinoma. Current international guidelines recommend endoscopic screening of CDH1 mutation carriers that consists of systematic biopsies of an otherwise normal appearing stomach. However, this approach lacks sufficient sensitivity for detecting intramucosal foci of signet ring cells (SRC), which are pathognomonic of HDGC syndrome. The goal of the current study is to utilize confocal endoscopic microscopy (CEM) for screening the gastric mucosa in this high-risk population.

Objective:

Determine if confocal endoscopic microscopy (CEM) will afford greater sensitivity for detection of signet ring cells (SRC) foci in CDH1 germline mutation carriers.

Eligibility:

CDH1 germline mutation carriers, or those who meet clinical criteria for HDGC testing but have tested negative for a CDH1 gene mutation or those who have other germline mutations suspected to be, or reported to be, associated with HDGC (e.g. Catenin Alpha 1 (CTNNA1).

Design:

Phase II, single-institution study of CEM for detection of intramucosal SRC foci compared to current systematic gastric mapping procedure.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 37

Inclusion Criteria

Not provided

Exclusion Criteria

Not provided

Study & Design

Study Type: INTERVENTIONAL

Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
1/Arm 1 - Upper white-light endoscopy and confocal endoscopic microscopy	Endoscope+Cellvizio(R) 100 microscope	Upper white-light endoscopy and confocal endoscopic microscopy

Primary Outcome Measures

Name	Time	Method
Percentage of Participants With Detectable Confocal Endoscopic Microscopy (CEM) w/Greater Sensitivity for Detection of Signet Ring Cells (SRC)Foci in Cadherin-1 (CDH1) Germline Mutation Carriers Compared to Current Method of Standard White Light Endoscopy	14 days	Sensitivity for detection of SRC foci in CDH1 germline mutation carriers was assessed by confocal endoscopic microscopy (CEM) compared to the current method of and standard white light endoscopy. Sensitivity in CEM and WLE is defined as the percentage of participants with detectable cancer on endoscopic biopsy.

Secondary Outcome Measures

Name	Time	Method
Percentage of Participants Who Have Signet Ring Cells (SRC) Foci Not Identified by Confocal Endoscopic Microscopy (CEM)	Date of enrollment to date of prophylactic gastrectomy, approximately 6 months or an average of 1 month up to 12 months.	In participants who choose to undergo prophylactic total gastrectomy with permanent pathologic analysis, the false negative rate (the fraction of participants who have SRC foci not identified by CEM and White Light Endoscopy techniques) will be determined and reported. The fraction percentage of patients who underwent prophylactic total gastrectomy with findings of SRC foci in the gastrectomy specimen will represent the denominator (number) and the number of patients with negative findings by CEM and White Light Endoscopy (WLE) will represent the numerator (number) to generate the false negative detection rate (fraction) for CEM and WLE, respectively.