Clinical Trial Evaluating the Efficacy of Capecitabine Plus Lenvatinib in Patients With Advanced Colorectal Cancer Refractory to Irinotecan, Oxaliplatin, and Fluoropyrimidine

Inclusion Criteria: * 1\) Voluntarily signed written informed consent 2) Male or female ≥19 years of age 3) Histologically confirmed metastatic or unresectable colorectal adenocarcinoma 4) Metastatic colorectal cancer refractory to irinotecan, oxaliplatin, and fluoropyrimidines 5) ECOG performance status 0, 1, or 2 6) Measurable lesion per RECIST v1.1 7) Hemoglobin ≥9.0 g/dL, ANC ≥1,500/μL, Platelets ≥100,000/μL, Serum creatinine \<1.5×ULN, AST/ALT \<3×ULN, Total bilirubin \<1.5×ULN (all without transfusion or G-CSF within 14 days of screening) 8) Able to understand and comply with the study protocol through completion 9) Women of childbearing potential: negative pregnancy test within 14 days before first dose; agreement to use adequate contraception for ≥6 months after last dose 10) Men with pregnant or potentially pregnant partners: agreement to use adequate contraception (e.g., condom) for ≥3 months after last dose Exclusion Criteria: * 1\) Pregnant or breastfeeding women 2) History of another malignancy within the past 5 years (except papillary or follicular thyroid cancer) 3) Uncontrolled infection or other systemic diseases 4) Known hypersensitivity to the investigational drugs 5) Presence of bowel stent or biliary stent with risk of perforation or bleeding 6) Esophageal/gastric varices or other risk of gastrointestinal hemorrhage 7) Presence of significant uncontrolled concurrent illness or recent medical condition, including but not limited to: * Significant car…