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Trial in China, for patients with metastatic CRC who have progressed or are intolerant after receiving ≥3 lines of standard therapy; they should have received at least one of these drugs: TAS-102, Regorafenib, Fruquintinib.
TQB2618: a monoclonal antibody targeting T cell immunoglobulin and mucin domain-3 (TIM-3) receptor. Immunotherapy.
Penpulimab: anti PD-1. Immunotherapy
Anlotinib hydrochloride: muti-target tyrosine kinase inhibitor (TKi). Oral.

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Age: 18-75 years old; Eastern Cooperative Oncology Group Performance Status (ECOG PS) score: 0-1; Expected survival of more than 3 months;
Histologically/cytologically confirmed metastatic colorectal cancer;
The subjects should provide tumor tissues that meet the requirements for mismatch repair protein detection and Programmed cell death-Ligand 1 (PD-L1) expression level detection;
Advanced colorectal cancer that progresses or is intolerant after receiving ≥3 lines of standard therapy;
Failure of treatment with at least one of these drugs (TAS-102, Regorafenib, Fruquintinib);
Confirmed presence of at least one measurable lesion according to Response Evaluation Criteria In Solid Tumors 1.1 (RECIST 1.1) criteria;
Body weight ≥40 kg and Body Mass Index (BMI) ≥18.5 kg/m^2.
The function of the main organs is good, and the laboratory examination meets the requirements;
Female subjects of reproductive age should agree to use contraception during the study period and for 6 months after the end of the study; Male subjects should agree that contraception must be used during the study period and for 6 months after the end of the study period.

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Have had or are currently suffering from other malignant tumors within 3 years;
Have any poorly controlled cardiovascular clinical symptoms or diseases;
Patients with ulcerative colitis and Crohn's disease; Patients with active inflammatory bowel disease within the first 4 weeks of enrollment;
Symptoms of hematemesis and hematochezia occurred within 6 months before screening, and the daily bleeding volume ≥ 2.5 mL;
The presence of unmitigated toxic reactions of grade 1 or above as assessed per Common Terminology Criteria for Adverse Events (CTC-AE) due to any treatment prior to first administration, excluding hair loss;
Patients who had received Programmed Death 1 (PD-1) or PD-L1 monoclonal antibody treatment and experienced ≥ grade 3 immune-related adverse reactions or stopped immune checkpoint inhibitor treatment due to immune-related adverse reactions;
Active or uncontrolled severe infection (≥CTC AE grade 2 infection);
Decompensated cirrhosis, active hepatitis;
Poor diabetes control (fasting blood glucose > 10 mmol/L);
Patients with renal failure requiring hemodialysis or peritoneal dialysis;
Have a clear history of neurological or psychiatric disorders, including epilepsy or dementia, and require treatment;
Had undergone a major surgical, open biopsy or significant traumatic injury within 4 weeks prior to the first dose of the study or expected to require major surgery during the study treatment.
Patients with arterial/venous thrombosis events, such as cerebrovascular accident, deep vein thrombosis and pulmonary embolism, occurred within 6 months before the study treatment;
Ascites with clinical significance, including any ascites that can be found by physical examination, ascites that have been treated in the past or still need to be treated, and only those who show a small amount of ascites but no symptoms on imaging can be included; Patients with an equal or greater amount of fluid in both pleural cavities, or a large amount of fluid in one pleural cavity, or have caused respiratory dysfunction and need drainage;
The presence of unhealed wounds, ulcers or fractures;
Have active tuberculosis, or have a history of active tuberculosis infection within 1 year prior to enrollment, or have a history of active tuberculosis infection more than 1 year prior to enrollment, but are not receiving treatment;
There is a history of idiopathic pulmonary fibrosis, institutional pneumonia, drug-induced pneumonia, radiation pneumonia requiring treatment or active pneumonia with clinical symptoms, and interstitial lung disease requiring steroid hormone therapy;
Have a history of immunodeficiency, including Human Immunodeficiency Virus (HIV) positive or other acquired or congenital immunodeficiency diseases, or have a history of organ transplantation or hematopoietic stem cell transplantation;
Imaging shows that the tumor has invaded large blood vessels or is not clearly demarcated with blood vessels;
Known central nervous system metastatic and/or cancerous meningitis;
Have multiple factors that affect oral medication (such as inability to swallow, chronic diarrhea, and intestinal obstruction);
Allergic to the ingredients of the investigational pharmaceutical preparations or excipients, or allergic to similar drugs;
An active autoimmune disease requiring systemic treatment (e.g., disease-modifying drugs, corticosteroids, or immunosuppressants) has occurred within 2 years prior to initial medication;
Have been diagnosed with immune deficiency or are receiving systemic glucocorticoid therapy or any other form of immunosuppressive therapy (dose > 10 mg/day prednisone or other therapeutic hormone) and continue to use within 2 weeks before the first dose;
History of live attenuated vaccine vaccination within 28 days before the first dose or planned live attenuated vaccine vaccination during the study period;
Have received systematic anti-tumor therapy and other interventional anti-tumor drug clinical trials such as radical surgery, chemotherapy, radical radiotherapy or immunotherapy, biotherapy, etc. within 4 weeks before the start of the study treatment;
Within 2 weeks prior to the first drug use, the treatment of Chinese patent drugs with anti-tumor indications specified in the National Medical Products Administration (NMPA) approved drug instructions.