Adults population over 40 years of age

Patients who understood this study process and agreed to participation of this study

Colon cancer patients who have been confirmed as colorectal cancer by endoscopic biopsy within 1 month

Colon cancer patients who received no anticancer treatment such as surgery, chemotherapy, radiation therapy after cancer diagnosis.

Colorectal adenoma and normal control group: Patients undergoing colonoscopy for diagnostic purposes or colorectal cancer screening.

Novel Blood-based Colorectal Cancer Screening Method Using Natural Killer Cell Activity and Gene Panel Expression