informCLL™: A Disease Registry for Patients With Chronic Lymphocytic Leukemia

Inclusion Criteria: * Age of at least 18 years * Clinical diagnosis of CLL/SLL that meets published diagnostic criteria (Hallek 2008) * Initiating anti-CLL/SLL treatment regimen (excluding clinical trials) within ±45 days of enrollment * Availability of documentation of previous CLL/SLL treatment and duration of response in the patient's medical records if patient has received prior line(s) of treatment (i.e. NOT treatment naïve) * Willing and able to provide informed consent * Willing and able to complete PRO instrument * Willing and able to provide information on patient survey questionnaire * Willing and able to provide a blood sample at time of enrollment prior to receiving treatment, as possible Exclusion Criteria: * Diagnosis of B-cell malignancies other than CLL/SLL * Estimated life expectancy \<6 months * Currently receiving treatment in an interventional clinical trial at time of entry into this study \* Note- Exceptions: 1) Patients may enroll in interventional clinical trials for indications other than CLL/SLL, 2) The interventional clinical trial treatment is not the treatment used for meeting Inclusion Criteria #2 (or "Index Treatment"), 3) Patients may enroll in an interventional clinical trial indicated for CLL/SLL as later line of treatment after discontinuing the Index Treatment