This is an observational, non-interventional, retrospective study to evaluate staining and interpretation concordance of CD30 expression detected by 9 immunohistochemistry (IHC) assays and VENTANA CD30 IHC assay in Chinese lymphoma participants.~This study will enroll approximately 1000 participants. The data will be collected via chart review in the electronic case report forms (eCRFs). All the participants will be assigned to a single observational cohort:~• Participants With Malignant Lymphoma~This multi-center trial will be conducted in China. The overall duration of the study will be approximately 21 months.
The main aim of this study is to improve methods of clinical testing and therapy for lymphoma participants.~This study will involve collecting information about participants from past medical records.