the investigators launched this exploratory study to evaluate the objective response rate (ORR) of SHR-1210 combined with apatinib mesylate in the first-line treatment of patients with 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.