Camrelizumab Plus Apatinib and Temozolomide as First Line Therapy in Advanced Acral Melanoma

Inclusion Criteria: 1. age:18-75 years, male or female. 2. Histopathologically confirmed recurrence, inoperable resection or metastatic acral melanoma (stage III/IV). 3. Has not received any systematic anti-tumor drug treatment. 4. Measurable disease based on Response Evaluation Criteria In Solid Tumors (RECIST) 1.1. 5. ECOG 0-1. 6. Adequate organ function. 7. Life expectancy of greater than 12 weeks. 8. Patient has given written informed consent. Exclusion Criteria: 1. Patients who have or are currently undergoing additional chemotherapy, radiation therapy, targeted therapy or immunotherapy. 2. Known history of hypersensitivity to macromolecular protein preparation or any components of the SHR- 1210 formulation. 3. Subjects before or at the same time with other malignant tumors (except which has cured skin basal cell carcinoma and cervical carcinoma in situ); 4. Subjects with any active autoimmune disease or history of autoimmune disease 5. Uncontrolled clinically significant heart disease, including but not limited to the following: (1) \> NYHA II congestive heart failure; (2) unstable angina, (3) myocardial infarction within the past 1 year; (4) clinically significant supraventricular arrhythmia or ventricular arrhythmia requirement for treatment or intervention; 6. Active infection or an unexplained fever \> 38.5°C during screening or before the first scheduled day of dosing (subjects with tumor fever may be enrolled at the discretion of the investigator); 7. Received a live vaccine within 4 weeks of the first dose of study medication. 8. Pregnancy or breast feeding. 9. Decision of unsuitableness by principal investigator or physician-in charge.