Ofatumumab and Dinaciclib in Treating Patients With Relapsed or Refractory Chronic Lymphocytic Leukemia, Small Lymphocytic Lymphoma, or B-Cell Prolymphocytic Leukemia

PRIMARY OBJECTIVES:

I. To determine the tolerable dose of combination therapy with ofatumumab and dinaciclib
(phase 1b component) in chronic lymphocytic leukemia (CLL), small lymphocytic leukemia (SLL),
and B-cell prolymphocytic leukemia (B-PLL).

II. To characterize the toxicity of combination therapy with ofatumumab and dinaciclib in
CLL/SLL/B-PLL.

III. To determine the overall response rate associated with this treatment as assessed by
consensus response criteria. (Phase II)

SECONDARY OBJECTIVES:

I. To estimate progression-free survival (PFS) after combination treatment with ofatumumab
and dinaciclib.

II. To characterize the pharmacokinetics of dinaciclib when given in combination with
ofatumumab.

III. To correlate pharmacokinetic features of dinaciclib with response, toxicity
(particularly tumor lysis syndrome), and pharmacodynamic endpoints.

IV. To perform detailed baseline and serial pharmacodynamic studies of combination therapy
with ofatumumab and dinaciclib and correlate these with response to therapy.

V. To correlate baseline disease-risk parameters (i.e., zeta-chain-associated protein kinase
[ZAP]-70 expression, interphase cytogenetics, immunoglobulin heavy chain variable region
[IgVH] mutational analysis, and other clinical prognostic factors) with response to therapy.

OUTLINE: This is a phase I, dose-escalation study followed by a phase II study.

Patients receive ofatumumab intravenously (IV) over 4-6 hours on days 1, 8, 15, and 22 of
courses 1-2, and on day 1 of courses 4-7. Beginning on course 2, patients also receive
dinaciclib IV over 2 hours on days 2, 8, and 15 of course 2, and on days 1, 8, and 15 of
courses 3-7. Treatment repeats every 28 days for up to 7 courses in the absence of disease
progression or unacceptable toxicity.

After completion of study treatment, patients are followed up every 3 months for 2 years and
then every 6 months for up to 3 years.

Inclusion Criteria:

- Patients must have histologically confirmed B-cell chronic lymphocytic leukemia
(B-CLL)/small lymphocytic lymphoma (SLL) or a B-cell prolymphocytic leukemia (B-PLL)
according to 2008 World Health Organization (WHO) diagnostic criteria

- Patients must meet one or more of the following modified indications for treatment as
described in the 2008 International Workshop on chronic lymphocytic leukemia (CLL)
(IWCLL) guidelines for the diagnosis and treatment of CLL:

- Progressive disease or marked splenomegaly and/or lymphadenopathy or disease
requiring de-bulking for future allogeneic transplantation

- Anemia (hemoglobin < 11 mg/dL) or thrombocytopenia (platelets < 100,000/μL)

- Unexplained weight loss exceeding 10% of body weight over the preceding 6 months

- Cancer Therapy Evaluation Program (CTEP) active version of the Common Terminology
Criteria for Adverse Events (CTCAE) grade 2 or 3 fatigue

- Fevers > 100.5 º F or night sweats for greater than 2 weeks without evidence of
infection

- Progressive lymphocytosis, with an increase exceeding 50% over a 2-month period
or a doubling time of less than 6 months

- Need for cytoreduction prior to allogeneic stem cell transplant

- Patients must have received at least one prior therapy that includes either
fludarabine or equivalent nucleoside analogue, or an alternative regimen if there was
a contraindication (i.e. autoimmune hemolytic anemia) or patient elected not to
receive fludarabine

- Eastern Cooperative Oncology Group (ECOG) performance status =< 2 (Karnofsky >= 60%)

- Life expectancy >= 12 weeks

- Absolute neutrophil count >= 1,000/μL in absence of bone marrow involvement

- Platelets >= 30,000/μL in absence of bone marrow involvement

- Total bilirubin =< 1.5 X institutional upper limit of normal (ULN) unless secondary to
Gilbert's

- Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase
[SGOT])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT])
=< 2.5 X institutional upper limit of normal (ULN) unless due to infiltration of the
liver

- Creatinine =< 2.0 mg/dL OR creatinine clearance >= 50 mL/min/1.73 m^2 for
patients(Cockcroft-Gault estimated)

- Patients with a history of current/previous infection with hepatitis B virus will be
eligible if receiving appropriate antiviral prophylaxis

- Women of child-bearing potential and men must agree to use adequate contraception
(hormonal or barrier method of birth control; abstinence) prior to study entry and for
the duration of study participation; should a woman become pregnant or suspect she is
pregnant while she or her partner is participating in this study, she should inform
her treating physician immediately

- Ability to understand and the willingness to sign a written informed consent document

Exclusion Criteria:

- Patients who have had chemotherapy or radiotherapy within 4 weeks (6 weeks for
nitrosoureas or mitomycin C) prior to entering the study or those who have not
recovered from adverse events due to agents administered more than 4 weeks earlier;
corticosteroids alone will not be considered prior therapy, but must be discontinued
at least 24 hours prior to the first day of therapy unless continued for indications
other than the primary malignancy

- Patients who are receiving any other investigational agents

- Patients who have received prior treatment with dinaciclib will not be eligible;
patients previously treated with ofatumumab will be eligible as long as their disease
responded to previous treatment (defined as achieving at least stable disease by
consensus criteria) and did not subsequently progress < 3 months from completing
treatment

- Patients with known brain metastases should be excluded from this clinical trial

- History of allergic reactions attributed to compounds of similar chemical or biologic
composition as dinaciclib

- History of anaphylactic reaction to rituximab or other anti-cluster of differentiation
(CD)20 monoclonal antibody

- Because dinaciclib is metabolized by the cytochrome P450, family 3, subfamily A,
polypeptide 4 (CYP3A4) liver enzyme, the eligibility of patients taking medications
that are potent inducers or inhibitors of that enzyme will be determined following a
review of their case by the principal investigator; every effort should be made to
switch patients taking such agents or substances to other medications; any identified
agent needs to be stopped at least 2 weeks prior to study registration; use of
aprepitant will be permitted, however, based on drug-drug interaction study performed
by the manufacturer showing no effect on dinaciclib pharmacokinetics (PK)

- Patients with glucose-6-phosphate dehydrogenase (G6PD) deficiency are excluded

- Uncontrolled intercurrent illness including, but not limited to, ongoing or active
infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac
arrhythmia, or psychiatric illness/social situations that would limit compliance with
study requirements

- Pregnant and/or breast-feeding women are excluded from this study; breastfeeding
should be discontinued if the mother is treated with dinaciclib

- Prior malignancy, except for adequately treated basal cell or squamous cell skin
cancer, in situ cervical cancer, or other cancer from which the subject is considered
by his or her physician to have a 2 year survival expectation

- Human immunodeficiency virus (HIV)-positive patients on combination antiretroviral
therapy are ineligible