A Trial of Camrelizumab Combined With Microwave Ablation and Chemotherapy in the Treatment of Colorectal Cancer Liver Metastasis/Pulmonary Metastasis

Inclusion Criteria: 1. Two types of imaging or histology/cytology confirmed colorectal cancer patients with liver metastasis/lung metastasis ; 2. Must have CT or MRI examination for the past 3 months; 3. In addition to ablation lesions, there are measurable metastatic lesions (spiral CT scan ≥10mm, meet mRECIST 1.1 standard); 4. Expected survival time\> 3 months; 5. Patients who have received at least one prior systemic treatment; 6. The damage caused by the subject receiving other treatments has been restored; 7. Known KRAS, NRAS, BRAF and HER2 gene status; 8. Age: 18 to 70 years old, no gender limit; 9. ECOG PS: 0-2 points; 10. The functions of vital organs meet the following requirements: 1. .Absolute neutrophil count ≥1.5×109/L, platelet ≥100×109/L, hemoglobin ≥9g/dL; 2. . Bilirubin ≤1.5 times ULN (can be included in patients drained by retrograde technique); ALT and AST ≤5 times ULN 3. . Creatinine \<120μmol/ L, or MDRD creatinine clearance rate\> 60 mL/min 11. Women of childbearing age must have a negative pregnancy test (βHCG) before starting treatment, Women and men of childbearing age (have sex with women of childbearing age) must agree to use effective contraception during treatment and for 6 months after the last treatment dose is administered 12. Signature of patient information and informed consent Exclusion Criteria: 1. Women who are pregnant or breastfeeding, or have fertility but refuse to take contraceptive measures; 2. Suffer from other malignant tumors within 5 years, except for fully treated cervical carcinoma in situ or skin squamous cell carcinoma, or skin basal cell carcinoma that has been basically controlled; 3. Those with uncontrolled, symptomatic brain metastases or a history of uncontrollable mental illness or severe intellectual or cognitive dysfunction; 4. Subjects with active, known or suspected autoimmune diseases, hypothyroidism requiring only hormone replacement therapy, skin diseases that do not require systemic treatment (such as vitiligo, psoriasis, or hair loss) Can be selected 5. Patients with active hepatitis B or C, chronic infection of hepatitis B virus (HBV) or hepatitis C virus (HCV) with a viral load of less than 500 IU/mL are allowed to participate in the study, but need to continue during the study period or start a full-course standardized antiviral treatment; 6. Congestive heart failure, uncontrollable arrhythmia, myocardial infarction, unstable angina, stroke or transient ischemic attack within 6 months; or other patients who cannot tolerate surgery; 7. Severe active infections that require intravenous antibiotic treatment occurred during the enrollment period; 8. Those who are allergic to test drugs; 9. Live vaccines have been vaccinated or will be vaccinated within 30 days before the administration of Camrelizumab; 10. Patients who cannot comply with the trial protocol or cannot cooperate with follow-up; 11. The researcher believes that it is inappropriate to participate in this trial.