In this open-label, multi-center, observational, post-marketing surveillance study, patients with ankylosing spondylitis, psoriatic arthritis, or rheumatoid arthritis received biosimilar etanercept 25 mg twice weekly or 50 mg once weekly in real-world settings. Safety and effectiveness of biosimilar etanercept were evaluated in study participants for a duration of up to 12 months. Patient information was recorded in four notebooks, and each notebook had three sections, one section for each month. The first section of notebook I contained demographic information, pregnancy and lactation status in female patients, cigarette smoking and alcohol consumption, and past medical history. All safety and effectiveness outcomes were recorded at the appropriate sections of the notebooks.
