A Dose Escalation and Cohort Expansion Study of Anti-CD27 (Varlilumab) and Anti-PD-1 (Nivolumab) in Advanced Refractory Solid Tumors

Varlilumab is a fully human monoclonal antibody that binds to a molecule called CD27 found on
certain immune cells and may act to promote anti-tumor effects.

Nivolumab is a fully human monoclonal antibody that binds to a molecule called PD-1 on immune
cells and promotes anti-tumor effects.

Eligible patients that enroll in the dose escalation portion of the study will be assigned to
one of three dose levels of varlilumab in combination with 3 mg/kg of nivolumab. The first
phase of the study will test the safety profile of the combination and determine which dose
will be studied in Phase ll of the overall study.

During Phase ll, depending on cancer type, groups of patients will be enrolled and receive
varlilumab at a dose of either 3 mg/kg every 2 weeks, 3 mg/kg every 12 weeks, or 0.3 mg/kg
every 4 weeks in combination with nivolumab at 240 mg.

All patients enrolled in the study will be closely monitored to determine if there is
response to the treatment as well as for any side effects that may occur.

Key Inclusion Criteria:

1. Histologically-diagnosed advanced (unresectable and/or metastatic) Non-small Cell Lung
Cancer (Phase l only), Melanoma (Phase l only), Colorectal, Head and Neck SCC
(squamous cell carcinoma), Ovarian Cancer, Glioblastoma or Renal Cell Carcinoma.

- 1a. Head and Neck

Stage III/IV squamous cell carcinoma; Tumor progression or recurrence within 6 months
of last dose of platinum therapy in the adjuvant, primary, recurrent or metastatic
setting (or within 9 months if the patient received > 1 platinum-based chemotherapy
regimen in the metastatic setting). Active brain metastases or leptomeningeal
metastases are excluded; nasopharyngeal cancer, confirmed recurrent or metastatic
carcinoma of the nasopharynx and salivary gland or non-squamous histologies are also
excluded.

- 1b. Ovarian

Recurrent or persistent epithelial ovarian, fallopian tube or primary peritoneal
carcinoma requiring original or subsequent relapse histologic documentation. A
platinum-taxane based chemotherapy regimen as frontline therapy must have been
completed.

Any histologic diagnosis of borderline, low malignant potential epithelial carcinoma
are excluded.

- 1c. Colorectal Cancer -Enrollment Completed

Metastatic or recurrent; prior treatment progression during, after, or intolerant
following the last administration of approved standard therapies (required therapies
apply).

- 1d. Glioblastoma -Enrollment Completed

Have histologically confirmed World Health Organization Grade IV malignant glioma
(glioblastoma).

- Previous first line therapy with at least radiotherapy and temozolomide.

- Participants must have shown unequivocal evidence of tumor progression.

- More than one relapse, secondary glioblastoma and prior treatment with
bevacizumab are excluded.

An interval of at least 12 weeks from the completion of radiation therapy to start of
study treatment is required.

- 1e. Renal Cell Carcinoma

Have histologically confirmed diagnosis of predominant clear cell renal cell
carcinoma.

- Must have received 1 or 2 prior anti-angiogenic therapies.

- No more than 5 total previous regimens of systemic therapy, including cytokines
and cytotoxic chemotherapy.

- Disease progression during or after the last treatment regimen and within 6
months before study entry.

2. No more than 5 prior anticancer regimens for advanced (recurrent, locally advanced or
metastatic) disease except for patients with GBM which must have first recurrence of
GBM by diagnostic biopsy or contrast enhanced magnetic resonance imaging (MRI).

3. Measurable (target) disease.

4. Life expectancy ≥ 12 weeks.

5. If of childbearing potential (male or female), agree to practice an effective form of
contraception during study treatment and for at least 23 weeks after for female and 31
weeks after for male following last treatment dose.

Key Exclusion Criteria:

1. History of severe hypersensitivity reactions to other monoclonal antibodies.

2. Prior therapy with an anti-PD-1, anti-PD-L1, or anti-PD-L2 antibody.

3. Receipt of anti-CTLA-4 or anti-CD27 antibody within 3 months prior to the planned
start of study treatment.

4. Use of any monoclonal based therapies within 2-4 weeks prior to the first dose of
study treatment.

5. Chemotherapy within 21 days or at least 5 half-lives (whichever is shorter) prior to
the planned start of study treatment.

6. BRAF/MEK inhibitors within 2 weeks prior to the first dose of study treatment.

7. Systemic radiation therapy within 4 weeks, prior focal radiotherapy within 2 weeks, or
radiopharmaceuticals (strontium, samarium) within 8 weeks prior to the first dose of
study treatment.

8. Use of immunosuppressive medications within 4 weeks or systemic corticosteroids within
2 weeks prior to first dose of study treatment.

9. Other prior malignancy, except for adequately treated basal or squamous cell skin
cancer or in situ cancers; or any other cancer from which the patient has been
disease-free for at least 3 years.

10. Active, untreated central nervous system metastases.

11. Active autoimmune disease or a documented history of autoimmune disease

12. Active diverticulitis.

13. Interstitial lung disease that is symptomatic or may interfere with the detection or
management of suspected drug-related pulmonary toxicity.

14. Significant cardiovascular disease