This multicenter observational cohort study is based on a patient registry designed to systematically collect uniform real-world clinical data from elderly patients with Hodgkin lymphoma (HL) in China. The registry captures demographic characteristics, disease features, laboratory parameters, treatment patterns, and longitudinal survival outcomes to support predefined scientific objectives.
The primary analysis uses retrospectively collected registry data, with prospectively accrued data incorporated for external validation of a prognostic prediction model. This registry-based study aims to improve risk stratification and inform individualized clinical decision-making for elderly patients with HL in routine clinical practice.