The study is pilot, observational, retrospective, Italian multicenter study.

The study will involve the collection of patient data from medical records of patients with R/R DLBCL treated with at least one dose of tafasitamab in association with lenalidomide as part of standard of care under the NPP (D.M. 7 Sep 2017), between April 2022 and December 2022, in several selected Italian centres. The observational, non-interventional nature of the study is based on the retrospective observation of current clinical practice without the application of any kind of ad hoc 'intervention' for the study itself. In fact, patients participating in the study will not be subjected to any procedures outside the normal clinical practice; likewise, the clinical variables that will be collected for the study are those that are already commonly collected by the physicians in clinical practice.

Inclusion Criteria:

1. Histologically confirmed diagnosis of R/R DLBCL.
2. Patientswho received at least one dose of tafasitamab in association with lenalidomide under the NPP (D.M. 7 Sep 2017), between April 2022 and December 2022.
3. Age ≥ 18 years at enrollment.
4. Signature of written informed consent (if applicable).

Exclusion Criteria:

1) R/R DLBCL patients who received tafasitamab in association with lenalidomide in a clinical trial context.

Patients with R/R DLBCL who have received at least one dose of tafasitamab in association with lenalidomide as part of standard of care under the NPP (D.M. 7 Sep 2017), between April 2022 and December 2022.