The aim of this study is to prospectively collect clinical information on patients with extranodal lymphoma, and to explore the best therapeutic strategies in the real-world population.

Lymphoma is a common hematological malignancy. Many different pathologic types of lymphoma can originate in extranodal organs or be associated with extranodal organ involvement. For lymphoma with extranodal involvement, conventional regimens often cannot provide satisfactory results for patients. This study aims to prospectively collect clinical information on patients with extranodal DLBCL, including the distribution of involved sites, clinical and molecular characteristics of different lymphoma subtypes, clinical treatment protocols, and prognosis, to explore the the best therapeutic strategies in the real-world population.

Inclusion Criteria:

1. Age ≥ 18 years (including 18 years old).
2. Patients newly diagnosed with non-Hodgkin lymphoma with extranodal involvement, whether it is primary, secondary, or cannot be determined.
3. Patients who have received systematic clinical treatment.
4. Patients with measurable lesions, at least containing one effective evaluation of efficacy.

Exclusion Criteria:

1. Patients who only receive supportive treatment.
2. Patients who cannot obtain effective evaluation data of efficacy.

Adult patients with histologically confirmed diagnosis of non-Hodgkin lymphoma with extranodal involvement.