Lymphoma is a type of cancer that affects the lymphatic system, which is part of our body's defense against germs. This study looks at Chinese patients with lymphoma to understand more about what causes it (pathogenesis) and what factors might predict how the disease progresses (prognostic factors). This is an observational study, which means researchers will review existing medical records without changing any treatments the patients are already receiving. This data includes patient details, tumor information, and treatment history.

• This study involves reviewing records from 2007 to 2027.
• Participants must have a confirmed lymphoma diagnosis and complete medical records.
• No new treatments are given, so there are no treatment-related risks from the study itself.