Inclusion

• Patients must have CLL, prolymphocytic leukemia, or lymphoma (Hodgkins or Non-Hodgkins) as defined by 2008 WHO criteria or multiple myeloma as defined by IMWG criteria
• Patients must have received at least one prior antineoplastic therapy, must have progressed after at least 1 prior therapy, and for whom no standard therapy is available or whom decline such options; prior autologous and/or allogeneic transplant is permitted
• Prior biologic therapy or prior radiation is permitted; however, at least 28 days must have elapsed since the completion of prior therapy and patients must have recovered from all therapy-associated toxicities to no greater than grade 1 at the time of registration
• Patients with symptomatic disease may receive palliative corticosteroids up to 1 week before initiating therapy
• Patients must be off any prior chemotherapy for at least 28 days or 3 half lives, whichever is longer, and all therapy-related toxicity must have resolved to grade 1 or less
• ANC >= 1000/uL
• Total bilirubin < 1.5 mg/dL
• Serum creatinine =< 1.5x institutional upper limit of normal or estimated creatinine clearance >= 50 ml/min by MDRD (original or abbreviated), or measured creatinine clearance >= 50 mL/min
• ECOG/WHO performance score of 0-1
• Patients must be able to swallow capsules
• Patients or their legal representatives must be able to read, understand and provide informed consent to participate in the trial
• Women with potential for child bearing must have a negative pregnancy test at screening; both men and women are required to use appropriate contraception during study
• Platelet count >= 50,000/uL
• AST and ALT =< 5x the institutional upper limit of normal

Exclusion

• Pregnant women are excluded from this study
• Patients with malabsorption or any other condition that in the opinion of the principal investigator could cause difficulty in absorption of drug
• Breastfeeding should be discontinued if the mother is treated with AR-42
• Patients with malignant cells in the cerebrospinal fluid or parenchyma within the preceding 3 months or patients with primary CNS lymphoma are not eligible
• Patients with uncontrolled autoimmune hemolytic anemia (AIHA) or idiopathic thrombocytopenic purpura (ITP) are not eligible
• Patients receiving concurrent corticosteroids less than 1 week prior to protocol therapy other than for physiologic maintenance treatment or control of AIHA or ITP
• Concurrent use of complementary or alternative medicines that in the opinion of the principal investigator would confound the interpretation of toxicities and/or antitumor activity of the study drug
• Patients with a "currently active" second malignancy that, in the opinion of the principal investigator, will interfere with patient participation, increase patient risk, shorten survival to < 1 year, or confound data interpretation
• Patients with a mean QTcB > 450 msec in males and > 470 msec in females
• Patients who are receiving concurrent antineoplastic therapy
• Any other medical condition, including mental illness or substance abuse, deemed by the principal investigator to likely interfere with a patient's ability to sign informed consent, cooperate and participate in the study, or interfere with the interpretation of the results
• Patients with significant cardiovascular disease, including a myocardial infarction or unstable angina within 6 months or unstable cardiac arrhythmias are not eligible for the study
• Known HIV infection