Phase II Safety and Efficacy Study of Single-agent AT-101 in Patients With Relapsed or Refractory B-cell Malignancies

Inclusion Criteria: * Must have a histologically confirmed B-cell malignancy (defined as FL \[any grade\], DLBCL, MCL or SLL/CLL); * Male or non-pregnant, non-lactating females age ≥18 years; * Ability to swallow and retain oral medication.; * Have failed at least one prior therapy and have documentation of either, relapsed disease, or refractory disease (i.e., no response or stable disease on their last regimen of therapy); * ECOG performance status 0 or 1; * All clinically significant toxicities from prior therapy must have fully resolved; * Must have discontinued treatment with monoclonal antibodies for a minimum of 90 days prior to first dose of AT-101, or have objective documentation of disease progression if within 90 days of monoclonal antibody administration; * Patients with FL, DLBCL, MCL, and SLL with normal lymphocyte counts must have at least one bi-dimensional lesion that is radiographically measurable (skin lesions, palpable lymph nodes, and bone marrow as the only site of disease are not considered measurable disease); * Patients with SLL whose lymphocytes are elevated at baseline or CLL must have palpable lymph nodes and/or disease localized to the bone marrow per the NCI-Sponsored Working Group Guidelines for CLL. Exclusion Criteria: * Requirement of systemic corticosteroids within 7 days prior to and during AT-101 administration; * Must not have received anti-cancer therapy within 28 days of first dose of AT-101. Cannot have received hormonal agents or biologic dose modifiers (with the exception of HRT) or any investigational treatments within 28 days of treatment with AT-101; * Patients with CNS lymphoma, HIV-related lymphoma, symptoms suggesting HIV infection or active auto-immune hemolytic anemia are excluded; * Previous treatment with gossypol, or are hypersensitive to its excipient are excluded; * Patients who have an uncontrolled, concurrent illness are also excluded.