Trial of 5-Fluorouracil (5FU)-Based Therapy in Combination With Fruquintinib in Patients With Locally Advanced Unresectable or Metastatic Colorectal Cancer

The intervention in this trial involves administering a combination of 5FU-based chemotherapy and fruquintinib to patients with locally advanced unresectable or metastatic colorectal cancer. Patients receive either the FOLFIRI or mFOLFOX6 regimen, both of which include 5-fluorouracil (5FU), leucovorin (LV), and either irinotecan (FOLFIRI) or oxaliplatin (mFOLFOX6). Fruquintinib is given orally once daily for 21 days in each 28-day cycle. The initial dose of fruquintinib is 4 mg daily for the first three patients to assess safety; if no dose-limiting toxicities are observed, the dose is increased to 5 mg daily for subsequent participants. Treatment continues until disease progression, unacceptable toxicity, or patient withdrawal. After six months, patients with stable disease or better transition to a maintenance phase with 5FU and fruquintinib alone.