Single Patient Classifier (SPC) Prediction for Stage II and III Advanced Gastric Cancer

Study Overview
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Brief Summary
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A retrospective, multi-center, single-blind, pivotal trial to assess clinical equivalence with stage II and III advanced gastric cancer based on the 6th and 8th of the AJCC

Detailed Description
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The safety and effectiveness of nProfiler® 1 Stomach Cancer Assay have been evaluated with stage II and III advanced gastric cancer patients based on the 6th of the American Joint Committee on Cancer (AJCC) through discovery clinical trial (418 patients) and confirmatory clinical trial (684 patients). The goal of this study, a retrospective, multi-center, single-blind, pivotal trial, is to assess clinical equivalence with stage II and III advanced gastric cancer based on the 6th and 8th of the AJCC and to evaluate prognostic equivalence between surgery only group and adjuvant chemotherapy group in Low risk group. The study will follow these procedures; Sample screening, Sample Preparation and Sample Criteria Evaluation, Sample enrollment, nProfiler® 1 Stomach Cancer Assay (gastric cancer prognosis prediction), Prognostic Result Report, and Evaluation of Clinical Performance.

Official Title
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A Retrospective, Multi-center, Single-blind, Pivotal Trial to Assess Clinical Equivalence With Stage II and III Advanced Gastric Cancer Based on the 6th and 8th of the AJCC

Conditions
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Gastric Cancer

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Sample providers criteria Male and female adult patients aged 19 years or over Postoperative patients with gastric cancer invading the submucosal layer and having 3 or more lymph nodes metastasis or who with gastric cancer infiltration of muscularis propria and lymph node metastasis (stage II and III advanced gastric cancer patients, 8th of the AJCC) Patients who have not received neoadjuvant chemotherapy and radiotherapy Patients with pathological record and clinical information after surgery from archived FFPE(formalin-fixed paraffin-embedded) samples between 2005 and 2010 Patients who have not been included in discovery clinical trial and confirmatory clinical trial Patients who have undergone a radical gastrectomy and who show no evidence of residual tumors as observed with the unaided eye or through a microscope Sample criteria The FFPE tumor specimens in storage have a tumor amount of at least 20% and therefore can be tested. The quantity (not less than 400ng) and quality (A260/280 of not less than 1.8) of RNA are sufficient for analysis. Exclusion Criteria: Sample providers criteria Male and female patients aged less than 19 years Postoperative patients with gastric cancer invading the mucosa and submucosal layer and having less than 3 lymph nodes metastasis or who with gastric cancer infiltration of muscularis propria without lymph node metastasis (stage II and III advanced gastric cancer patients, 8th of the AJCC) Patients who have received neoadjuvant chemotherapy or radiotherapy Patients without pathological record and clinical information after surgery from archived FFPE samples between 2005 and 2010 Patients who have been included in discovery clinical trial and confirmatory clinical trial Patients with residual tumors after surgery Sample criteria The FFPE tumor specimens in storage have a tumor amount of less than 20% and therefore cannot be tested The quantity and quality of RNA are not sufficient for analysis

Ages Eligible for Study
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Minimum Age: 19 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Low risk<br>good prognosis with surgery only and adjuvant chemotherapy patients | |
| Intermediate risk<br>moderate prognosis | |
| High risk<br>poor prognosis | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Differences in prognosis | Differences in prognosis between Low risk group and High risk group (AJCC 8th, Advanced gastric cancer stage II and III) | 5 years after the date of surgery for patients in Low risk group and High risk group | 
| Comparability of prognostic stratification | Comparability of prognostic stratification with stage II and III advanced gastric cancer based on the 6th and 8th of the AJCC | 5 years after the date of surgery for patients in Low risk group and High risk group | 
| Prognostic equivalence | Prognostic equivalence between surgery only group and adjuvant chemotherapy group in Low risk group | 5 years after the date of surgery for patients in surgery only group and adjuvant chemotherapy group in Low risk group | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Multivariate analysis | Multivariate analysis with age, sex, TNM stage, adjuvant-chemotherapy | 5 years after the date of surgery for patients with stage II-III advanced gastric cancer (8th of the AJCC) |