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

June 17, 2021 updated by: Jeremy Davis, M.D., National Cancer Institute (NCI)

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

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.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

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.

Study Type

Interventional

Enrollment (Actual)

37

Phase

  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Maryland
      • Bethesda, Maryland, United States, 20892
        • National Institutes of Health Clinical Center

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

  • INCLUSION CRITERIA:
  • Patients with Cadherin-1 (CDH1) germline mutation known to be pathogenic or likely pathogenic, which may also be classified as "significant" or "likely significant" (patients with variants of "uncertain significance " are excluded)

or

-Patients with Catenin Alpha 1 (CTNNA1) and partner and localizer of breast cancer 2 (BRCA2) (PALB2) germline mutations suspected to be, or reported to be, associated with hereditary diffuse gastric cancer (HDGC) syndrome.

or

  • In the absence of a germline CDH1 mutation, patients must meet clinical criteria for genetic testing due to a history suggestive of Hereditary Diffuse Gastric Cancer (HDGC) syndrome
  • Age greater than or equal to 18 years.
  • Physiologically able to undergo upper endoscopy.
  • Ability to understand and the willingness to sign a written informed consent document.
  • Pregnant women are eligible during second trimester of pregnancy if clinically indicated for evaluation of cancer.

EXCLUSION CRITERIA:

  • Current use of therapeutic anticoagulation medication
  • Known bleeding disorder or thrombocytopenia.
  • Unstable angina or recent (within 3 months) myocardial infarction
  • Any clinical contraindication to general anesthesia

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Diagnostic
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: 1/Arm 1 - Upper white-light endoscopy and confocal endoscopic microscopy
Upper white-light endoscopy and confocal endoscopic microscopy
Device: Endoscope+Cellvizio(R) 100 microscope
Patients will undergo white-light, upper endoscopy. In addition, during this endoscopy patients will undergo Confocal Endoscopic Microscopy (CEM) using the Cellvizio probe (Mauna Kea Technologies) to scan the same anatomic zones.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
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
Time Frame: 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.
14 days

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Percentage of Participants Who Have Signet Ring Cells (SRC) Foci Not Identified by Confocal Endoscopic Microscopy (CEM)
Time Frame: 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.
Date of enrollment to date of prophylactic gastrectomy, approximately 6 months or an average of 1 month up to 12 months.

Other Outcome Measures

Outcome Measure
Measure Description
Time Frame
Number of Participants With Serious and Non-serious Adverse Events Assessed by the Common Terminology Criteria for Adverse Events (CTCAE v5.0)
Time Frame: Date of enrollment to date off study, approximately 11 months and 19 days.
Here is the number of participants with serious and non-serious adverse events assessed by the Common Terminology Criteria for Adverse Events (CTCAE v5.0). A non-serious adverse event is any untoward medical occurrence. A serious adverse event is an adverse event or suspected adverse reaction that results in death, a life-threatening adverse drug experience, hospitalization, disruption of the ability to conduct normal life functions, congenital anomaly/birth defect or important medical events that jeopardize the patient or subject and may require medical or surgical intervention to prevent one of the previous outcomes mentioned.
Date of enrollment to date off study, approximately 11 months and 19 days.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

National Cancer Institute (NCI)

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

February 11, 2019

Primary Completion (Actual)

April 20, 2020

Study Completion (Actual)

May 5, 2020

Study Registration Dates

First Submitted

August 24, 2018

First Submitted That Met QC Criteria

August 24, 2018

First Posted (Actual)

August 28, 2018

Study Record Updates

Last Update Posted (Actual)

July 12, 2021

Last Update Submitted That Met QC Criteria

June 17, 2021

Last Verified

June 1, 2021

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 180141
  • 18-C-0141

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

Yes

IPD Plan Description

We will share the study protocol, statistical analysis plan, and clinical study report.

IPD Sharing Time Frame

For 2 years from date of study completion.

IPD Sharing Access Criteria

Requests must be made by clinical investigators with interest and/or expertise in gastrointestinal cancers or endoscopic surveillance techniques.

IPD Sharing Supporting Information Type

  • Study Protocol
  • Statistical Analysis Plan (SAP)
  • Clinical Study Report (CSR)

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

Yes

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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