AssesSment of Early-deteCtion basEd oN liquiD Biopsy in GASTRIC Cancer, ASCEND-Gastric

Inclusion Criteria for Cancer Arm Participants: * Age 40-75 years at the day of consenting to the study. * Able to provide a written informed consent. * No prior cancer treatment (local or systematic) with either of the following: A. Pathologically confirmed cancer diagnosis within 42 days prior to blood draw. B. High suspicious for cancer diagnosis by imaging tests or other routine clinical examinations, with confirmed pathological cancer diagnosis within 42 days after the blood draw. Exclusion Criteria for Cancer Arm Participants: * Insufficient qualified blood samples. * During pregnancy or lactation. * Recipient of organ transplant or prior non-autologous (allogeneic) bone marrow or stem cell transplant. * Recipient of blood transfusion within 7 days prior to blood draw. * Recipient of anti-tumor drugs to treat non-cancer diseases within 30 days prior to blood draw. * With other known malignant tumors or multiple primary tumors. Inclusion Criteria for Benign Disease Arm Participants: * Age 40-75 years at the day of consenting to the study. * Able to provide a written informed consent. * Able to provide sufficient and qualified blood samples for study tests. * Have either of the following: A. Pathological confirmed diagnosis of benign diseases within 90 days prior to the study blood draw, with no prior treatment such as surgical resection. B. High suspicious for benign diseases diagnosis by radiological or other routine clinical assessments, with confirmed benign diseases diagnosis within 42 days after study blood draw. Exclusion Criteria for Benign Disease Arm Participants: * Insufficient qualified blood sample for study test. * During pregnancy or lactation. * Recipient of organ transplant or prior non-autologous (allogeneic) bone marrow or stem cell transplant. * Recipient of blood transfusion within 7 days prior to study blood draw. * Recipient of anti-tumor drugs to treat non-cancer diseases within 30 days prior to blood draw.