This is phase 1 study to Compare the Pharmacokinetics, Safety and Immunogenicity of the Auto-injector and Pre-filled syringe of CT-P43 in Healthy Male Subjects.

CT-P43, containing the active ingredient ustekinumab, is being developed by CELLTRION, Inc. as a proposed biosimilar to the reference product, Stelara. In this study, Pharmacokinetics, Safety and Immunogenicity of the Auto-injector and Pre-filled syringe of CT-P43 will be evaluated in Healthy Male Subjects.

Inclusion Criteria:

• Healthy male subjects, between the ages of 19 and 55 years, both inclusive.
• Subject has a body weight between 60 to 90 kg, both inclusive, and a BMI between 18.5 and 29.9 kg/m2, both inclusive, when rounded to the nearest tenth.

Exclusion Criteria:

• A medical history and/or condition that is considered significant
• Clinically significant allergic reactions, hypersensitivity
• History or current infection of hepatitis B virus, hepatitis C virus, human immunodeficiency virus, or syphilis
• Active or latent Tuberculosis
• History of malignancy
• Previous exposure to ustekinumab or a biosimilar of ustekinumab or any drug that directly targets interleukin (IL)-12, IL-17 or IL-23