The purpose of this study is collect and evaluate the clinical experience reached in Italy on the use of bendamustine alone or combined with rituximab as treatment of patients with relapsed or refractory chronic lymphoproliferative disorders.

All patients who meet the criteria for inclusion will be included in the study. A specific database will be created to collect the following information: personal data, medical history, histology related to the underlying disease, comorbidities, laboratory data, initial staging, data on the dosage and the number of cycles administered, the recorded toxicity data, the clinical response and the main events (relapse, progression, death, and cause of death). These data will then be retrospectively examined in order to obtain information about the life-saving treatment.

Inclusion Criteria:

• patients with relapsed or refractory chronic lymphoproliferative disorders
• salvage treatment with Bendamustine +/- Rituximab
• age ≥ 18 years

Exclusion Criteria:

• previous treatment with Bendamustine

All patients with relapsed or refractory chronic lymphoproliferative disorders treated with Bendamustine +/- Rituximab