Autologous Dendritic Cells Pulsed With Tumor Lysate Antigen Vaccine and Nivolumab in Treating Patients With Recurrent Glioblastoma

PRIMARY OBJECTIVES:

I. To evaluate the safety and tolerability of the combination treatment of autologous
dendritic cells pulsed with tumor lysate antigen vaccine (DCVax-L) and nivolumab.

II. To compare overall survival (OS) from the date of surgery in a pooled evaluation of group
1 subjects receiving DCVax-L and group 2 subjects receiving DCVax-L and nivolumab to recent
historical standards.

III. To compare OS between the two groups.

SECONDARY OBJECTIVES:

I. Safety. II. Feasibility. III. Tumor response. IV. Immune response. V. Quality of Life
(QoL). VI. Overall survival (OS). VII. Overall survival rate at 9, 12, and 18 months. VIII.
Progression-free survival (PFS). IX. Evaluation of the safety of the DCVax-L + nivolumab
combination regimen.

TERTIARY OBJECTIVES:

I. Estimate correlation of quantitative assessments of tumor-infiltrating lymphocyte (TIL)
proliferation (CD8+/Ki-67+ staining).

II. Estimate difference in PD-1 and PD-L1 immunohistochemistry expression between density or
clonality with clinical responses to combination therapy in recurrent glioblastoma subjects.

III. Estimate differences between outcome groups in monocytic PD-L1 expression at baseline
and over time.

IV. Estimate differences between outcome groups in circulating tumor DNA, circulating tumor
cells, and CD4+ T cells at baseline and over time.

V. Estimate difference in PD-1 and PD-L1 immunohistochemical (IHC) expression between
archived and study samples.

VI. Explore patterns of tumor proteomic profiling. VII. Estimate efficacy of combination
therapy by progression-free survival (PFS), rates of contrasted tumor change over time, and
overall survival (OS).

VIII. Explore effect of nivolumab on TIL proliferation (CD8+/Ki-67+ staining). IX. Explore
whether oligoclonal T cell populations within tumor tissue are similarly expanded in
peripheral blood after nivolumab, the magnitude of which correlates with clinical responses.

X. Explore if changes in specific MRI parameters correlate with tumor and peripheral blood
immune responses.

XI. Explore if a mesenchymal gene expression signature present in the initial archived tumor
sample correlates with T lymphocytic response in tumor after nivolumab.

XII. Correlate changes of positron emission tomography (PET) in tumor with the following: TIL
density or clonality, clinical outcome, T cell measures in peripheral blood, clinical
toxicity.

XIII. Correlate changes in PET in lymph nodes with the following: TIL density or clonality,
clinical outcome, T cell measures in peripheral blood, clinical toxicity.

XIV. Correlate changes in PET in organ tissue with TIL density or clonality.

OUTLINE: Patients are randomized to 1 of 2 groups.

GROUP I: Patients receive dendritic cell-autologous lung tumor vaccine intradermally (ID) on
days 0, 7, 14, and weeks 4, 6, 8, 11, 14, 17 and 20.

GROUP II: Patients receive dendritic cell-autologous lung tumor vaccine as in Group I, and
nivolumab intravenously (IV) over 30 minutes on days 0, 14, and weeks 4, 6, 8, 11, 14, 17,
and 20.

After completion of study treatment, patients are followed up for up to 12 months.

Inclusion Criteria:

- PRE-SURGERY SCREENING PROCESS

- Original diagnosis of glioblastoma multiforme (GBM) confirmed by central review

- Radiographic evidence of first recurrence per Response Assessment in Neuro-Oncology
(RANO) criteria confirmed by central review

- Surgically accessible, unilateral, recurrent GBM tumor for which extirpative
resection, with intent to perform a gross total or near gross total resection, is
indicated; a subject may be screened if he or she has had a previous biopsy and is
scheduled for a subsequent gross or near gross total resection prior to commencement
of other therapies

- Ability to understand and sign the tumor procurement informed consent form indicating
awareness of the investigational nature of this study; the consent for tumor tissue
donation may be signed by a legally authorized representative (LAR) if allowed by the
institution

- Life expectancy of >= 12 weeks

- Absolute lymphocyte count >= 0.6 x 10^3/mm^3 (0.6 x 10^9/L)

- MGMT promoter methylation status of original tumor is obtainable

- POST-SURGERY, PRIOR TO PRE-LEUKAPHERESIS

- Therapy for recurrent disease must have consisted of surgical resection extending
beyond biopsy only, with the intent to achieve gross or near-total resection of the
contrast-enhancing tumor mass; subjects who underwent resection confirmed beyond
biopsy remain eligible for the screening process; subjects undergoing a biopsy only
will be excluded; central confirmation is required before the subject can proceed to
leukapheresis

- Patients with recurrent unilateral GBM, confirmed through central pathology (grade
IV), without metastases, remain eligible for this protocol

- For the purposes of this study, pathology reports for all histologically
confirmed GBM includes the recognized variants of glioblastoma (small cell
glioblastoma, giant cell glioblastoma, gliosarcoma, and glioblastoma with
oligodendroglial components)

- All subjects must have sufficient tumor lysate protein generated from the resected
tumor tissue; this determination will be made by the sponsor's contracted manufacturer
and communicated to the clinical site through the sponsor or its designee; this
confirmation is not required prior to the pre-leukapheresis visit, but is required
before the subject can proceed to leukapheresis

- PRE-LEUKAPHERESIS EVALUATION

- Hemoglobin > 10 g/dL (100 g/L)

- White blood cell count 3.6-11.0 x 10^3/mm^3 (3.6-11.0 x 10^9/L)

- Absolute granulocyte count >= 1.5 x 10^3/mm^3 (1.5 x 10^9/L)

- Absolute lymphocyte count >= 1.0 x 10^3/mm^3 (1.0 x 10^9/L)

- Platelet count >= 100 x 10^3/mm^3 (100 x 10^9/L)

- Eligibility is maintained if these laboratory results are outside of the central
laboratory's normal reference ranges or the sample ranges provided above but are not
deemed clinically significant by the treating investigator

- Eligibility level of hemoglobin can be reached by transfusion; these values are
determined by a central laboratory

- Serum glutamate pyruvate transaminase (SGPT) =< 4.0 times upper limits of normal (ULN)

- Serum glutamic-oxaloacetic transaminase (SGOT) =< 4.0 times ULN

- Alkaline phosphatase =< 4.0 times upper limits of normal (ULN)

- Total bilirubin =< 1.5 mg/dL (25.7 umol/L)

- Blood urea nitrogen (BUN) =< 1.5 times ULN

- Creatinine =< 1.5 times ULN

- Subjects must have a Karnofsky performance status (KPS) rating >= 70 at the
pre-leukapheresis visit

- PRIOR TO DAY 0

- Subjects may have received steroid therapy as part of their primary treatment; steroid
treatment should be stopped or, if continued steroid use is clinically indicated, be
tapered down to no more than 2 mg dexamethasone per day (or equivalent) at least 7
days prior to the first immunization

- White blood cell count >= 2.0 x 10^3/mm^3 (2.0 x 10^9/L)

- Neutrophils >= 1.5 x 10^3/mm^3 (1.5 x 10^9/L)

- Platelets >= 100 x 10^3/mm^3 (100 x 10^9/L)

- Hemoglobin >= 9.0 g/dL (90 g/L)

- Serum creatinine =< 1.5 x upper limit of normal (ULN)

- SGOT (aspartate aminotransferase [AST]) =< 3 x ULN

- SGPT (alanine aminotransferase [ALT]) =< 3 x ULN

- Total bilirubin =< 1.5 x ULN

- Except subjects with Gilbert's syndrome, who must have total bilirubin < 3.0
mg/dL

- Subjects must have a KPS rating a >= 60 at the pre-enrollment evaluation

Exclusion Criteria:

- PRE-SCREENING

- Progression on imaging based on RANO criteria within 12 weeks of conclusion of
radiotherapy

- History of other prior malignancy except for adequately treated basal cell or squamous
cell skin cancer or in situ cervical cancer or other cancers that were deemed fully
resolved 5 or more years prior to surgery

- History of active, known, or suspected autoimmune or immunodeficiency disease

- Known human immunodeficiency virus (HIV)-1 or -2 or human T-cell lymphotropic virus
(HTLV)-1 or -2 positivity

- Active uncontrolled infection, such as a sexually transmitted disease (STD), herpes,
uncontrolled tuberculosis, malaria, etc

- Known intolerance to cyclophosphamide or other alkylating agents, or any component of
any study drug

- History of active immunotherapy, including dendritic cell therapy, T cell therapy,
immunization with tumor antigens in any form, any anti-PD-1, anti-PD-L1, anti-PD-L2,
or anti-CTLA-4 antibody, or any other antibody or drug specifically targeting T-cell
costimulation or immune checkpoint pathways or checkpoint inhibitor therapy such as
ipilimumab

- History of severe infusion-related reaction to any biologics therapy

- Females who are gravid or breast-feeding

- Inability to obtain informed consent because of psychiatric or complicating medical
problems

- Any known genetic cancer-susceptibility syndromes

- Any positive test for hepatitis B virus surface antigen (HBV sAg) or hepatitis C virus
ribonucleic acid (HCV antibody) indicative of acute or chronic infection

- AT OR AROUND SURGERY

- Bilateral or metastatic glioblastoma detected at diagnosis, during surgery, or at
post-surgical magnetic resonance imaging (MRI); tumors may cross into, but not beyond,
the corpus callosum

- Postoperative MRI evidence of biopsy only, without significant tumor resection,
confirmed by central reviewer

- Implantation of Gliadel wafers (polifeprosan 20 with carmustine implant) at surgery

- PRE-LEUKAPHERESIS VISIT

- Positive HIV-1, -2, or HTLV-1, -2 tests

- Recipient of organ allografts

- Allergies to reagents used in this study

- Unable to stop or taper steroid treatment to no more than 2 mg of dexamethasone per
day (or equivalent) prior to leukapheresis; steroid use should be stopped or tapered
down to the lowest clinically acceptable dose approximately 7 days prior to
leukapheresis; the leukapheresis visit must be scheduled to occur a minimum of 21 days
before the projected day 0

- It is critical to reduce steroid administration to the lowest possible dose, as
steroids interfere with DCVax-L manufacturing by hampering the ability of
monocytes to adhere to plastic surfaces during purification; leukapheresis should
occur at least 21 days prior to the projected date of DCVax-L administration

- Inability or unwillingness to return for required visits and follow-up exams

- EXCLUSION PRIOR TO DAY 0

- Fewer than 6 doses of DCVax-L available for administration

- Continued requirement for medications that might affect immune function; the following
are exceptions: nonprescription strength doses of NSAIDS, acetaminophen (paracetamol),
or acetylsalicylic acid (aspirin)

- Acute infection: any active viral, bacterial, or fungal infection that requires
specific therapy; antibiotic therapy must be completed at least 7 days prior to the
first DCVax-L/nivolumab administration

- Fever >= 101.5 degrees Fahrenheit (F) (38.6 degrees Celsius [C]); if considered
possibly transient, retesting is allowed

- Unstable or severe intercurrent medical conditions

- Women of child-bearing potential (WOCBP) who are pregnant or lactating or who are not
using adequate contraception and willing to do so to avoid pregnancy for 5 months
after the week 20 visit

- Males who are sexually active with WOCBP and not willing to use any contraceptive
method with a failure rate of less than 1% per year for 7 months after the week 20
visit

- Any dose of steroids exceeding 10 mg/day of prednisone (or equivalent) within 2 weeks
prior to study drug administration