Study of Binimetinib + Nivolumab Plus or Minus Ipilimumab in Patients With Previously Treated Microsatellite-stable (MSS) Metastatic Colorectal Cancer With RAS Mutation

Key Inclusion Criteria

- Measurable, histologically/cytologically confirmed metastatic colorectal cancer
(mCRC).

- Able to provide a sufficient amount of representative tumor specimen for central
laboratory testing of RAS mutation status and microsatellite stable (MSS).

- If a fresh tissue sample is provided, a blood sample is required.

- Metastatic colorectal cancer (mCRC) categorized as microsatellite stable (MSS) by
polymerase chain reaction (PCR) per local assay at any time prior to Screening or by
the central laboratory.

- RAS mutation per local assay at any time prior to Screening or by the central
laboratory.

- Have received at least 1 prior line of therapy and meets at least one of the following
criteria:

- were unable to tolerate the prior first-line regimen

- experienced disease progression during or after prior first-line regimen for
metastatic disease

- progressed during or within 3 months of completing adjuvant chemotherapy. Note:
Generally, treatments that are separated by an event of progression are
considered different regimens.

- Have received no more than 2 prior lines of therapy (maintenance therapy given in the
metastatic setting will not be considered a separate regimen). Generally, treatments
that are separated by an event of progression are considered different regimens.

- Adequate bone marrow, cardiac, kidney and liver function

- Able to take oral medications

- Eastern Cooperative Oncology Group (ECOG) performance status (PS) of 0 or 1.

- Female patients are either postmenopausal for at least 1 year, are surgically sterile
for at least 6 weeks, or must agree to take appropriate precautions to avoid pregnancy
from screening through follow-up if of child-bearing potential

- Non-sterile male patients who are sexually active with female partners of childbearing
potential must agree to follow instructions for acceptable or highly effective
method(s) of contraception for the duration of study treatment and for 7 months after
the last dose of study treatment with nivolumab

Key Exclusion Criteria

- Prior treatment with any MEK inhibitor, an anti-PD-1, anti-PD-L1, anti-PD-L2,
anti-CD137, or anti-CTLA-4 antibody, or any other antibody or drug specifically
targeting T-cell co-stimulation or checkpoint pathways.

- Any untreated central nervous system (CNS) lesion.

- Patients with an active, known or suspected autoimmune disease. Patients with type I
diabetes mellitus, hypothyroidism only requiring hormone replacement, skin disorders
(such as vitiligo, psoriasis, or alopecia) not requiring systemic treatment, or
conditions not expected to recur in the absence of an external trigger are permitted
to enroll.

- Known history of retinal vein occlusion (RVO).

- Known history of Gilbert's syndrome.

- Pregnant or breastfeeding females.

- Treatment with systemic immunosuppressive medications (including but not limited to
prednisone, cyclophosphamide, azathioprine, methotrexate, thalidomide, and anti-tumor
necrosis factor [anti-TNF] agents) within 2 weeks prior to first day of study
treatment:

- History of thromboembolic or cerebrovascular events ≤ 6 months prior to starting study
treatment, including transient ischemic attacks, cerebrovascular accidents, deep vein
thrombosis or pulmonary emboli.

- Uncontrolled hypertension defined as persistent systolic blood pressure ≥ 150 mmHg or
diastolic blood pressure ≥ 100 mmHg despite current therapy.

- Concurrent neuromuscular disorder that is associated with the potential of elevated
creatine kinase (CK) (e.g., inflammatory myopathies, muscular dystrophy, amyotrophic
lateral sclerosis, spinal muscular atrophy).

- History or current evidence of retinal vein occlusion (RVO) or current risk factors
for RVO (e.g., uncontrolled glaucoma or ocular hypertension, history of hyperviscosity
or hypercoagulability syndromes).

- Known history of positive test for human immunodeficiency virus (HIV) or known
acquired immunodeficiency syndrome (AIDS). NOTE: Testing for HIV must be performed at
sites where mandated locally.

- Any positive test for hepatitis B virus or hepatitis C virus indicating acute or
chronic infection, and/or detectable virus.