A Prospective Cohort Study on Colorectal Cancer Screening in Community Population

Study Overview
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Brief Summary
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This study will validate the real world results of polygene methylation detection in colorectal cancer in a large prospective community cohort. In this study, questionnaire survey and polygene methylation detection technology of colorectal cancer were used as preliminary screening methods, and colonoscopy was used as further validation examination method to screen colorectal cancer and precancerous lesions. The diagnosis and outcome of all lesions were based on colonoscopy and pathological examination.

Detailed Description
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The informed consent signed by shougang Community will be completed in the baseline period: Colorectal cancer risk factors assessment questionnaire, medical history collection, fecal immunochemical (FIT), carcinoembryonic antigen (CEA) blood test and blood bowel cancer gene methylation detection, for colorectal cancer gene methylation detection results more positive subjects and the result of the negative part of the subjects (n = 500), within 3 months after receiving the results complete colonoscopy. Follow-up at 1, 2, 3, 4, and 5 years after baseline included: ① Central follow-up at 1, 3, and 5 years: history collection, colonoscopy, FIT test, and CEA examination; ② Telephone follow-up at the 2nd and 4th years: medical history was collected; (3) Survival outcome registration was performed in the fifth year; Follow-up history was collected at 1, 2, 3, 4, and 5 years after completion of baseline, and survival outcomes were registered at 5 years. During the follow-up, the subjects were confirmed to be diagnosed with colorectal cancer by evaluation (colorectal cancer was diagnosed by colonoscopy), and the subjects who were treated after polyps or adenomas were found during colonoscopy also reached the study endpoint.

Official Title
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Colorectal Cancer Screening Cohort Study in Shougang Community Population Based on Polygene Methylation Detection Technology

Conditions
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Colorectal Cancer

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Chronological age ≥40 years; Full capacity for action; After enrollment, the participants were able to complete the Colorectal Cancer Risk Factor Assessment Questionnaire and the annual follow-up interviews; In the course of the study, the information related to tumor diagnosis in other hospitals can be timely fed back to the researchers; Exclusion Criteria: History of colorectal cancer and other malignant tumors; Previous colorectal resection; undergoing any cancer-related treatment; Patients who have received major surgical treatment such as blood transfusion or transplantation within 3 months; Participate in other interventional clinical investigators within 3 months; Pregnant or lactating women; Have autoimmune disease, hereditary disease, mental illness/disability, etc Poor compliance, unable to complete the study.

Ages Eligible for Study
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Minimum Age: 40 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Positive group<br>All the subjects who completed colorectal cancer polygene methylation test at baseline completed colonoscopy within 3 months. Colorectal cancer diagnosed by colonoscopy, adenoma or polyp lesions found after treatment will reach the end of the study. The tumor history of family members was tracked for patients who met the end point of the study. The positive subjects who did not reach the end point of the study underwent three center visits at 12, 36 and 60 months after enrollment respectively, including history taking, colonoscopy, FIT test and blood CEA test. Another telephone follow-up was conducted at 24 and 48 months, respectively. | |
| Negative group<br>The subjects who completed colorectal cancer polygene methylation test at baseline, and those with negative test results (n= 500, direct extraction method) completed colonoscopy within 3 months. The end points and follow-up were the same as those in the positive group. The negative group was compared with the positive group to observe the difference of negative predictive value and survival outcome. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Sensitivity and specificity of polygene methylation detection in colorectal cancer | To investigate the sensitivity and specificity of polygene methylation in the diagnosis of colorectal cancer in community population, and to evaluate its value as an auxiliary diagnosis | assessed up to 72 months | 
| Negative predictive value and positive predictive value of polygene methylation in colorectal cancer | To obtain the positive predictive value and negative predictive value of polygene methylation test for colorectal cancer early screening, and compare with FIT test and blood CEA test. | assessed up to 72 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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ctDNA methylation, Community population screening