Inclusion Criteria:

• Men and women with recurrent surface immunoglobulin positive B cell non-Hodgkin's lymphoma (NHL) according to WHO classification (including, but not limited to, CLL/SLL, Waldenström's macroglobulinemia [WM], mantle cell lymphoma [MCL], and diffuse large B cell lymphoma [DLBCL) who had stable disease or response to PCI-32765 for at least 6 months on a prior PCI-32765 study and want to continue study drug.
• Eastern Cooperative Oncology Group (ECOG) performance status of ≤ 2
• Agreement to use contraception during the study and for 30 days after the last dose of study drug if sexually active and able to bear children
• Willing and able to participate in all required evaluations and procedures in this study protocol including swallowing capsules without difficulty
• Ability to understand the purpose and risks of the study and provide signed and dated informed consent and authorization to use protected health information (in accordance with national and local subject privacy regulations)

Exclusion Criteria:

• A life-threatening illness, medical condition or organ system dysfunction which, in the investigator's opinion, could compromise the subject's safety, interfere with the absorption or metabolism of PCI-32765 PO, or put the study outcomes at undue risk
• Significant cardiovascular disease such as uncontrolled or symptomatic arrhythmias, congestive heart failure, or myocardial infarction within 6 months of screening, or any Class 3 or 4 cardiac disease as defined by the New York Heart Association Functional Classification.
• Malabsorption syndrome, disease significantly affecting gastrointestinal function, or resection of the stomach or small bowel or ulcerative colitis, symptomatic inflammatory bowel disease, or partial or complete bowel obstruction.
• Concomitant immunotherapy, chemotherapy, radiotherapy, corticosteroids (at dosages equivalent to prednisone > 20 mg/day ), or experimental therapy
• Concomitant use of medicines known to cause QT prolongation or torsades de pointes
• Central nervous system (CNS) involvement by lymphoma
• Known history of Human Immunodeficiency Virus (HIV) or active infection with Hepatitis C Virus (HCV) or Hepatitis B Virus (HBV) or any uncontrolled active systemic infection.
• Creatinine > 1.5 x institutional upper limit of normal (ULN); total bilirubin > 1.5 x ULN (unless due to Gilbert's disease); and aspartate aminotransferase (AST) or alanine aminotransferase (ALT) > 2.5 x ULN unless disease related
• Lactating or pregnant