Magnifying Endoscopy With Narrow Band Imaging Versus Endoscopic Ultrasonography for Prediction of Tumor Invasion Depth in Early Gastric Cancer: A Prospective Comparative Study

• Conditions: Early Gastric Cancer; Gastric Adenoma; Gastric Dysplasia
• Interventions: Device: magnifying endoscopy with narrow band imaging (ME-NBI)

• Registration Number: NCT03546257
• Lead Sponsor: Yonsei University

Brief Summary

The treatment of early gastric cancer can be divided into endoscopic resection and surgery, and the precise staging of early gastric cancer is very important to prevent unnecessary surgery or additional surgery after the procedure. The possibility of endoscopic resection is determined by the risk of lymph node metastasis. The risk factors of lymph node metastasis of early gastric cancer are lesion size, presence of ulceration, histologic differentiation, and depth of invasion. In contrast to other factors, the factor of invasion depth is relatively difficult to predict by using the conventional white light endoscopy (WLE). Therefore, the endoscopic ultrasonography (EUS) has been tried to use for prediction of the invasion depth. However, many studies reported that the accuracy of endoscopic ultrasonography for predicting the depth of invasion was varied.

A system consisting of a magnifying endoscope combined with narrow-band imaging (NBI), with the spectral band width narrowed by optical filters, was developed to enhance visualization of mucosal surface structure and vascular architecture. There were some reports that the magnifying endoscopy with narrow band imaging (ME-NBI) is superior to predict the histologic differentiation, depth of invasion and lesion margin than WLE.

In this study, we divide the patients with suspected early gastric cancer (EGC) into the two groups as group using conventional WLE and EUS and group using WLE and ME-NBI, and try to compare the accuracy of EUS and ME-NBI for predicting the invasion depth of EGC. We also try to analyze the factors that affect the accuracy for predicting of depth such as characteristics of cancer lesion and histologic differentiation of cancer in each group. In addition, we try to analyze the characteristic imaging findings of ME-NBI for early gastric cancer and gastric adenoma and evaluate the efficacy of ME-NBI for early gastric cancer and gastric adenoma diagnosis.

Detailed Description

The subjects is divided into early gastric cancer patients and gastric adenoma patients according to histologic biopsy result and white light endoscopic findings. Study 1 applies for early gastric cancer patients, Study 2 applies for gastric adenoma patients.

A) Study 1 The NBI group performs ME-NBI first before EUS. The endoscopist evaluates NBI findings such as the invasion depth and describes ME-NBI impression. And then, EUS is performed likewise. The final treatment plan is determined by the EUS result, so group assignment does not affect the final treatment plan.

The EUS group performs EUS first before NBI. The endoscopist evaluates EUS findings such as the invasion depth and describes EUS impression. And then, ME-NBI is performed likewise. The final treatment plan is determined by the EUS result, so group assignment does not affect the final treatment plan.

According to clinical stage of early gastric cancer, endoscopic resection is performed in case of endoscopic resection indication or beyond indication but case of having the risk of surgery according to patient status. The surgical resection is performed if the patient wants surgery or does not meet the indications of endoscopic resection.

The pathologist performs a histological evaluation of the resected gastric cancer lesion, including an invasive depth.

B) Study 2 First, the endoscopist performs WLE and describes WLE findings and impression such as location, size, and gross morphology of lesion. The same examiner performs ME-NBI and describes ME-NBI findings and impression such as mucosal pattern, predicted degree of dysplasia.

Endoscopic resection or surgical resection is performed according to the results of histologic result of gastric adenoma.

The pathologist performs a histological evaluation of the resected dysplastic lesion.

Study Timeline

• Study First Submitted: 2018-05-21
• Study First Submitted QC: 2018-06-03
• Study First Posted: 2018-06-06
• Status Verified: 2019-02
• Last Update Submitted: 2019-02-08
• Last Update Posted: 2019-02-11
• Study Start: 2019-03
• Primary Completion: 2019-10-01
• Study Completion: 2020-04

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 250

Inclusion Criteria

1. Adults over 19 years of age
2. Patients who are diagnosed gastric adenoma or early gastric cancer by esophagogastroduodenoscopy and are planning endoscopic resection or surgical resection for cure.
3. Patients who understand that they have the right to sign the consent form prior to the initiation of treatment and to withdraw from the clinical trial without penalty at any time.

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Exclusion Criteria

1. Failed to obtain informed consent of the patient or guardian.
2. Anyone deemed inappropriate by the researchers or the primary care physician in clinical studies.
3. Women who are pregnant and possibly pregnant or breastfeeding

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Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
ME-NBI	magnifying endoscopy with narrow band imaging (ME-NBI)	group using WLE and ME-NBI.

Primary Outcome Measures

Name	Time	Method
the accuracy in predicting the invasion depth of EGC.	Within 1 month after lesion resection	To compare the accuracy of EUS and ME-NBI in predicting the invasion depth of EGC using final pathology result.

Secondary Outcome Measures

Name	Time	Method
The NBI findings that affect the accuracy for predicting of depth.	Within 1 month after lesion resection	The characteristic imaging findings of ME-NBI for early gastric cancer and gastric adenoma such as microvessels, pits, histological patterns.; For example) ME-NBI classification Type A : clear regular surface patterns and microvascular architecture. Type B : obscure irregular surface patterns or microvascular architecture. Type C :no surface pattern and sparse microvessels or with avascular areas. Finally, to evaluate the efficacy of ME-NBI for early gastric cancer and gastric adenoma diagnosis.