Study to Assess Food Effect on Pharmacokinetics of Entinostat in Subjects With Breast Cancer or Non-Small Cell Lung Cancer

This is Phase 1, randomized, open-label, study of entinostat. The study is designed to
evaluate any food effect on the pharmacokinetics of entinostat.

Patients will be randomized to receive entinostat with or without food on Cycle 1 Day 1
(C1D1). Patients randomized to receive entinostat with food on C1D1 will receive a second
dose of entinostat without food on Cycle 1 Day 15 (C1D15). Patients randomized to receive
entinostat without food on C1D1 will receive a second dose of entinostat with food on C1D15.
Each cycle in the study will be for 28 days duration. Blood samples will be obtained
pre-dose and serial blood samples will be taken after each dose to assess pharmacokinetics.
For Cycle 2 and all subsequent cycles, all patients will continue to receive entinostat on
Days 1 and 15 of each cycle. Those with breast cancer will also receive exemestane orally
once daily starting on Cycle 2 Day 1. Those with NSCLC will also receive erlotinib starting
on Cycle 2 Day 1.

Patients will be assessed at screening and at pre-prescribed times during study enrollment
using standard assessments. Patients will also be assessed for tumor response after each 2
cycles. Patients will continue receiving study treatment until tumor progression or adverse
events occur which necessitate discontinuing therapy as determined by the Investigator.

Inclusion Criteria:

Breast Cancer Patients Only

- Postmenopausal female patients

- Histologically or cytologically confirmed ER+ breast cancer at initial diagnosis and
now has current disease progression and is a candidate to receive exemestane

NSCLC Patients Only:

- Cytologically or histologically confirmed NSCLC of stage IIIb or IV

- Received 1 to 2 prior chemotherapy or chemoradiotherapy regimens for advanced NSCLC
(excluding erlotinib and valproic acid) and now has disease progression and is a
candidate to receive erlotinib

All Patients:

- Age ≥ 18 years

- Patient must have the following laboratory parameters at study screening: Hemoglobin
≥ 9.0 g/dL; unsupported platelets ≥ 100.0 10-9/L; ANC ≥ 2.0 x 10-9/L; Creatinine less
than 2.5 times the upper limit of normal for the institution; AST and alanine
transaminase (ALT) < 2.5 times the upper limit of normal for the institution

- Patients may have a history of brain metastasis as long as certain criteria are met

Exclusion Criteria:

- Pregnant or lactating women

- Patient has rapidly progressive or life-threatening metastases.

- Patient has had previous treatment with entinostat or any other HDAC inhibitor
including valproic acid

- Patient has a concomitant medical condition that precludes adequate study treatment
compliance or assessment, or increases patient risk in the opinion of the
investigator, such as but not limited to:

MI or arterial thromboembolic events within 6 months, or experiencing severe or unstable
angina, New York Heart Association (NYHA) Class III or IV disease and a QTc interval >
0.47 seconds.

Uncontrolled heart failure or hypertension, uncontrolled diabetes mellitus, uncontrolled
systemic infection.

- Patients with another active cancer (excluding adequately treated basal cell
carcinoma or cervical intraepithelial neoplasia [CIN / cervical carcinoma in situ] or
melanoma in situ). Prior history of other cancer is allowed, as long as there is no
active disease within the prior 5 years.