Study of TGF-β Receptor Inhibitor Galunisertib (LY2157299) and Enzalutamide in Metastatic Castration-resistant Prostate Cancer

Inclusion Criteria:

- Have metastatic castration-resistant prostate cancer

- Must have had prior abiraterone treatment

- Life expectancy of greater than 3 months

- ECOG performance status 0 or 2

- Age ≥18 years

- Have measurable disease

- Patients acceptance to have a tumor biopsy of an accessible lesion at baseline and on
treatment if the lesion can be biopsied with acceptable clinical risk (as judged by
the investigator).

- Ability to take oral medication

- Patients must have adequate organ and marrow function defined by study-specified
laboratory tests

- Must use acceptable form of birth control while on study

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

Exclusion Criteria:

- Known history or evidence of brain metastases

- Prior chemotherapy for metastatic disease in castration-resistant prostate cancer

- Had surgery within 4 weeks prior to the first dose of study drug

- Had radiation, biological, or other investigational cancer therapy within 2 weeks
prior to the first dose of study drug

- Had second-line hormonal therapy within 2 weeks prior to the first dose of study drug

- Systemic steroids within 1 weeks prior to the first dose of study drug

- Had prior enzalutamide, ARN-509, or galeterone therapy

- Have moderate or severe cardiovascular disease

- Have a history of a seizure

- Have uncontrolled intercurrent illness, including but not limited to ongoing or active
infection, systematic congestive heart failure, unstable angina pectoris, cardiac
arrhythmia or psychiatric condition that would limit compliance with study
requirements

- Have a history of any autoimmune disease:inflammatory bowel disease, (including
ulcerative colitis and Crohn's Disease), rheumatoid arthritis, systemic progressive
sclerosis (scleroderma), systemic lupus erythmatosus (SLE) autoimmune vasculitis
(e.g., Wegener's Granulomatosis), CNS or motor neuropathy considered to be of
autoimmune origin (e.g., Guillian-Barre Syndrome, Myasthenia Gravis, Multiple
Sclerosis)

- Have known history of infection with HIV, hepatitis B, or hepatitis C