Safety and Efficacy Study of GL-0817 (With Cyclophosphamide) for the Prevention of Recurrence of Squamous Cell Carcinoma of the Oral Cavity

Inclusion Criteria:

1. Age > 18 years

2. Histologic diagnosis of squamous cell carcinoma of the oral cavity including the lip,
floor of mouth, anterior 2/3 of tongue, alveolus and gingiva, buccal mucosa, hard
palate and retromolar trigone

3. Subjects must have undergone primary gross total resection (no re-resected patients
are allowed) with fulfillment of at least 1 of the following histologic criteria for
high-risk disease:

- Histologic involvement of 2 or more regional lymph nodes

- Any lymph node with histologic extracapsular extension (ECS)

- Close (<3mm) or positive surgical margins on microscopic evaluation with no gross
residual tumor

4. No evidence of locoregional disease or distant metastases at screening. Subjects must
have negative scans (CT, CT-PET or MRI) for locoregional recurrence, brain or lung
metastases. A negative biopsy will be mandated in patients with a positive scan. Other
evaluations should be performed as clinically indicated.

5. No history of distant metastases.

6. Tumor tissue from surgery or biopsy must be available to determine MAGE-A3 expression
for correlative studies.

7. Following surgery, the patient must have received external beam radiotherapy (58-66 Gy
in 2 Gy fractions, 5 days per week) with concomitant cisplatin starting within 8 weeks
of surgery. A brief delay in the initiation of radiotherapy following 8 weeks
post-surgery due to administrative reasons (e.g., start of RT on Mondays) may be
permitted by the Medical Monitor. The cumulative dose of cisplatin the subject
received must be > 150 mg/m2. Protocol therapy must be initiated within a period of
4-8 weeks (28-56 days) following the end of RT.

8. The patient is, in the investigator's opinion, adequately recovered from the effects
of surgery and chemoradiotherapy to participate in this study.

9. Blood HLA-A2 phenotype

10. ECOG Performance Status < 1

11. Laboratory values obtained ≤ 14 days prior to randomization:

- Absolute neutrophil count (ANC) ≥ 1500/μL (without intervention, e.g., G-CSF)

- Platelets ≥ 75,000/μL (without intervention, e.g., transfusion)

- Hemoglobin ≥ 8.0 g/dl (Note: The use of transfusion or other intervention to
achieve Hgb ≥8.0 g/dl is acceptable).

- Alkaline phosphatase ≤ 2.5 x upper limit of normal (ULN)

- AST and ALT ≤ 2 x ULN

- Creatinine < 2 x ULN

- Bilirubin < 1.5x ULN (except for patients with Gilbert's disease, for whom the
upper acceptable limit of serum bilirubin is 3mg/dL)

12. A female subject is eligible to enter the study if she is:

- not pregnant or nursing; Female participants must not breastfeed during the study
and for a period of 30 days following the last dose.

- of non-childbearing potential (i.e., women who had a hysterectomy, are
postmenopausal which is defined as 1 year without menses, have both ovaries
surgically removed or have current documented tubal ligation); or

- of childbearing potential (i.e., women with functional ovaries and no documented
impairment of oviductal or uterine function that would cause sterility). This
category includes women with oligomenorrhea [even severe], women who are
perimenopausal or have just begun to menstruate. These women must have a negative
serum pregnancy test at screening, and agree to one of the following:

- complete abstinence from intercourse from 2 weeks prior to administration of
the 1st dose of study agent and 6 months after the last dose of study agent;
or

- consistent and correct use of 1 of the following highly effective methods of
birth control for one month prior to the start of the study agent and 6
months after the last dose:

- combined (estrogen and progestogen containing) hormonal contraception associated
with inhibition of ovulation (oral, intravaginal, transdermal)

- progestogen-only hormonal contraception associated with inhibition of ovulation
(oral, injectable, implantable)

- intrauterine device (IUD)

- intrauterine hormone-releasing system ( IUS)

- bilateral tubal occlusion

- vasectomized partner (if vasectomized is the sole sexual partner and has received
medical confirmation of surgical success)

13. A male subject who is sexually active with a woman of childbearing potential is
eligible to enter the study if he agrees to use effective contraception throughout the
study and for 6 months after the last dose of study agent.

14. The subject must be capable of understanding the investigational nature, potential
risks and benefits of the study and capable of providing valid informed consent. The
subject must provide study specific informed consent prior to any protocol procedures
that are not a part of standard care, including consent for assessment of HLA-A2
status, mandatory tissue submission for MAGE-A3 analysis and correlative studies.

15. The subject must be willing to return to the study center for vaccinations and
study-related follow up procedures including blood and tumor collections and
completion of imaging studies as required by the protocol.

Exclusion Criteria:

1. Known HIV or hepatitis B/C infection (testing not required). Subjects who are
hepatitis C antibody positive may be enrolled if they are confirmed to have a negative
viral load at screening.

2. Subjects with active autoimmune disease or a history of autoimmune disease requiring
systemic steroids or other immunosuppressive treatment.

3. Subjects who have used systemic corticosteroids or other immunosuppressants for any
condition within 14 days of randomization. Inhaled or topical steroids are permitted.

4. Any medical condition which would, in the investigator's opinion, compromise the
patient's ability to mount an immune response, renders the patient a poor candidate
for this trial or could confound the results of the study

5. Major surgery or traumatic injury within 28 days of randomization

6. Prior splenectomy or organ allograft

7. Any other prior, concurrent or planned chemotherapy, immunotherapy, radiotherapy,
device, or investigational therapy for this cancer other than those specified in this
study.

8. History of other malignancy (i.e., excluding disease under study) within 3 years of
randomization. Exceptions include: adequately-treated basal cell or squamous cell skin
cancer, carcinoma in situ of the cervix or breast, or adequately treated
non-metastatic prostate cancer.

9. Known hypersensitivity to GM-CSF, yeast-derived products or any component of the
GM-CSF drug product (e.g., mannitol) or poly-ICLC (e.g., carboxymethylcellulose).

10. Known hypersensitivity to cyclophosphamide, its metabolites or any other components,
or known urinary outflow obstruction.