Diagnosis of Multiple Cancer and Monitoring of Minimal Residual Tumors After Treatment Using Blood and High-Sensitivity Genetic Analysis Techniques

Cancer patients will undergo serial peripheral blood sampling at baseline (prior to surgery or chemotherapy), after treatment, and during follow-up visits. Blood samples will be analyzed for circulating tumor DNA (ctDNA), cell-free DNA (cfDNA), RNA, and protein biomarkers. The purpose is to detect variant allele frequency (VAF) and evaluate its relationship with tumor dynamics and treatment outcomes, including recurrence and survival.

Control participants, including individuals with asymptomatic gallstones, benign polyps, or those undergoing health screening, will provide a one-time peripheral blood sample. The sample will be analyzed for cfDNA, RNA, and protein biomarkers and used as a baseline reference to compare molecular characteristics between non-cancer and cancer groups.