A Study to Compare the PK , Safety, Tolerability, and Immunogenicity of HLX13 With YERVOY in Male Subjects

Inclusion Criteria: 1. Willing to sign the informed consent form. 2. Healthy Chinese males (no significant clinical abnormalities in medical history, physical examination, vital signs, chest X-ray, 12-lead ECG, and laboratory examinations). 3. Age ≥ 18 and ≤ 60 years old. 4. Body mass index (BMI) ≥ 18.5 and ≤ 28 kg/m2. 5. Left ventricular ejection fraction (LVEF) \> 50%, as measured by echocardiography within 14 days before randomization. 6. Subjects either agree that they and their spouse/partner will take reliable contraceptive measures within 3 months after the end of drug infusion or be infertile. Exclusion Criteria: 1. History of any severe hematological or renal, endocrinic, respiratory, gastrointestinal, cardiovascular, hepatic, neuropsychiatric, or neurological diseases or tumors. 2. Use of a monoclonal antibody or any biological product within 6 months prior to the study treatment. 3. History of allergy or anaphylaxis, including that due to any drug or drug excipients in clinical studies. 4. Use of prescription/over-the-counter drugs or traditional Chinese medicines (except vitamins, mineral supplements, and health products) within 28 days prior to the study treatment. 5. History of blood donation within 3 months prior to the study treatment. 6. Participation in another clinical study and use of a clinical investigational drug or reference product within 3 months prior to the study treatment, or planning to participate in another drug clinical trial during the study period. 7. Positive for hepatitis B surface antigen (HBsAg), hepatitis C virus (HCV) antibody, human immunodeficiency virus (HIV) antibody, or Treponema pallidum antibody. 8. History of drug abuse, or positive urine drug screen during the screening period. 9. Have undergone surgery within 3 months before screening or plan to undergo surgery during the study period; have undergone surgery that will affect drug absorption, distribution, metabolism, and excretion. 10. Have been vaccinated within 28 days prior to screening or plan to be vaccinated during the study. 11. Intolerant to venipuncture or with a history of needle or blood phobia. 12. People on special diets who reject the arranged meals. 13. Smoking more than 5 cigarettes per day within 3 months before screening or cannot stop using any tobacco products during the study. 14. An average daily alcohol intake of more than 15 g (equivalent to 450 mL beer or 150 mL wine or 50 mL low-alcohol liquor) within 1 month prior to screening; or a positive blood alcohol test at screening; or unwilling or unable to abstain from alcohol during the study. 15. Failure to comply with protocol requirements and instructions, protocol restrictions, etc., as judged by the investigator; uncooperative or unable to return to the study site for follow-up visits or complete the entire clinical study process, etc.