Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of VAY736 in Relapsed or Refractory CLL Patients

Inclusion Criteria: * Dose escalation: Relapsed/refractory CLL following at least -two prior treatment regimen * Dose expansion: * Arm 1: Relapsed/refractory CLL following two to three prior treatment regimens * Arm 2: Relapsed/refractory CLL following four or more prior treatment regimens * Discontinued any previous anti-cancer and investigational therapy including radiation, radioimmunotherapy, and monoclonal antibody therapy for at least 28 days or 5 half-lives of the investigational product, whichever is longer, before study treatment administration, and must have recovered fully from the adverse effects of such treatment before beginning study treatment * Discontinued prior alemtuzumab therapy for at least 6 months * Age 18 years * Eastern cooperative oncology group (ECOG) performance status grade ≤ 1 * Life expectancy \> 3 months * Meet the following laboratory criteria (must be obtained within 14 days of enrollment): • Adequate end-organ function as assessed by laboratory tests, as specified in the protocol. * Written informed consent obtained prior to any screening procedures Exclusion Criteria: * Major surgery within 28 days before study treatment or have not recovered fully from the adverse effects of any major or minor surgical procedures before study treatment * History of another primary malignancy that is currently clinically significant or currently requires active intervention (except adequately treated in situ carcinoma of the cervix or non-melanoma carcinoma of the skin or any other curatively treated malignancy that has not been treated in the prior 3 months or expected to require treatment for recurrence during the course of the study). * Prior anaphylactic or other severe infusion reaction such that the patient is unable to tolerate human immunoglobulin or monoclonal antibody administration * Clinically significant central nervous system disease * Myocardial infarction within 6 months prior to enrollment or New York Hospital Association (NYHA) Class III or IV heart failure, uncontrolled angina, severe uncontrolled ventricular arrhythmias, or electrocardiographic evidence of acute ischemia or significant conduction system abnormalities in the opinion of the investigator * History of an active infection requiring systemic therapy within 14 days before study treatment. Prophylactic antibiotics and antiviral therapies are permitted. * Active autoimmune disease requiring immunosuppressive therapy * Known history of human immunodeficiency virus (HIV) or active infection with hepatitis C virus or hepatitis B virus or any active bacterial, viral, or fungal infection requiring systemic therapy * Ongoing corticosteroid use (\>10 mg/day prednisone or equivalent) * Pregnant or nursing (lactating) women. * Sexually active males must use a condom during intercourse while taking the drug and for 3 months after stopping treatment and should not father a child in this period. A condom is required to be used also by vasectomized men in order to prevent delivery of the drug via seminal fluid.