Exploratory Study of Irinotecan Liposomes in Maintenance Therapy of Metastatic Colorectal Cancer

70 mg/m\^2 , d1, 14 days per cycle. Until the disease progresses, intolerable toxicity occurs, and the patient withdraws informed consent (whichever comes first).

5mg/kg, d1, 14 days per cycle. Until the disease progresses, intolerable toxicity occurs, and the patient withdraws informed consent (whichever comes first).