Critères d'inclusion : - Participants with diagnosed Chronic Lymphocytic Leukemia (CLL) and eligible for venetoclax as per label.
- Participants for whom the physician has decided to initiate CLL treatment with venetoclax.
- Participants the physician believes he can personally follow over all the study period.
- Participants who have been informed verbally and in writing about this study, and who do not object to their data being electronically processed or subjected to data quality control.
Critères de non-inclusion : - Participating in a clinical trial with an investigative drug for CLL within 30 days prior to treatment initiation.