Compare Pharmacokinetic, Safety, Tolerability and Immunogenicity of HLX12 and Ramucirumab in Healthy Male Adult Subjects

Inclusion Criteria: Healthy adult male aged 18-50 years (including 18 and 50 years old) with a body mass index of 18-28 kg/m2 (including 18 kg/m2 and 28 kg/m2), weighing ≥50 kg and ≤80 kg; Exclusion Criteria: Previous or current atopic allergies, hypersensitivity reactions, or allergic reactions that are clinically significant, including known or suspected clinically relevant drug allergies to a component of the study drug or the control drug; Any disease that may affect the safety of the subject or affect the study operation and assessment, according to the investigator's judgment; Have undergone surgery in the past 8 weeks, or are planned for surgery during the study period; Have been inoculated with live virus vaccine within 4 weeks prior to screening, or intend to be inoculated with live virus vaccine during the study period until the end of the last follow-up; Any prior history of exposure to anti-VEGF or anti-VEGF receptor monoclonal antibodies/proteins; Exposure to any monoclonal antibody within 12 months prior to study drug administration; Have used any clinical study drug within 3 months prior to screening, or are still in the follow-up period of a clinical study; Have taken non-steroidal anti-inflammatory drugs (NSAIDs) within 14 days prior to the study drug administration, including any dose of aspirin. NSAIDs (except acetaminophen) shall not be used during the study; QTc interval \> 450 ms; ECG is abnormal and the abnormality is clinicaly significant as judged by the investigator; Have taken any alcoholic products within 48 hours prior to the study drug administration; Subjects who have a family history of hypertension, or are found with abnormal blood pressure at screening or on admission to the study site (Day-1): systolic blood pressure ≥140 mmHg or diastolic blood pressure ≥90 mmHg, which is judged by the investigator as clinically significant ; Have a genetic predisposition to bleeding or thrombosis, or a history of bleeding due to non-trauma (ie, bleeding requiring medical intervention), a thromboembolic event, or any condition that may increase the risk of bleeding, including coagulopathy, thrombocytopenia (platelet count \<100\*109/L) or international normalized ratio (INR) higher than 1.5;