Trial to Evaluate Safety and Tolerability of GP-2250 in Combination With Gemcitabine

In Phase 1 of the study, the dose-limiting toxicity (DLT) assessment period will be 5
weeks---one-week run-in at each dose level of intravenous GP-2250 monotherapy followed by a
full cycle of GP-2250 plus gemcitabine (3 weeks on and 1 week off). Single-subject cohorts
will be enrolled until the occurrence of the first DLT, at which point cohorts will be
expanded to 3 subjects. If there are no DLTs observed within the first 3 single subject
cohorts, there will be an expansion to 3 subject cohorts beginning with Cohort#4. Between
single-subject cohorts, dose escalation increments of GP-2250 will be 100%. Beginning with
the Cohort#4 further dose escalation increments between cohorts will be 35% to 45%. Subjects
may continue to receive treatment until disease progression by Response Evaluation Criteria
In Solid Tumors (RECIST) Version 1.1 criteria, clinical disease progression as assessed by
the Investigator, development of a DLT (in Phase 1) or unacceptable toxicity, the subject
requests withdrawal, the subject meets one of the criteria for treatment discontinuation, the
Investigator determines the risks outweigh the benefits of continuing therapy, withdrawal of
subject consent, or closure of the trial by the Sponsor.

In Phase 2, subjects will receive weekly doses of GP-2250 in combination with a standard dose
of gemcitabine for 3 consecutive weeks (3 weeks on therapy and 1 week off). A Simon Two-Stage
design will be used. In the first stage, 10 subjects will be enrolled. If at least 2
responses are observed, an additional 19 subjects will be enrolled. If at the end of the
Phase 2 stage of the trial at least 6/29 responders are observed, it can be concluded that
the response rate (RR) with GP 2250+gemcitabine is consistent with that of approximately 30%.
Subjects may continue to receive treatment until withdrawn by the Investigator, the subject
requests withdrawal, unacceptable toxicity occurs, the subject meets one of the criteria for
treatment discontinuation, or disease progression, or closure of the trial by the sponsor.

Inclusion Criteria:

Informed Consent:

1. Capable of giving signed informed consent as described in Appendix 1: Regulatory,
Ethical, and Trial Oversight Considerations which includes compliance with the
requirements and restrictions listed in the informed consent form (ICF) and in this
protocol.

Age:

2. Male and female subjects age > 18 years at the time of trial entry. Type of Subject
and Disease Characteristics

3. Histologically or cytologically confirmed advanced unresectable or metastatic
pancreatic adenocarcinoma

4. Subjects should be eligible to receive gemcitabine monotherapy for the treatment of
their pancreatic cancer per the judgment of the Investigator

5. Subjects must have documented disease progression while receiving or within 3 months
of completing prior treatment with FOLFIRINOX.

6. Subjects must have at least one RECIST Version 1.1 defined measurable tumor lesion

7. Subjects must have an Eastern Cooperative Oncology Group Performance Status (ECOG PS)
of 0-1.

8. Subjects with known central nervous system metastasis must have undergone brain
targeted treatment and must be asymptomatic or radiographically and clinically stable
(including not requiring steroids or anti-seizure medications) for at least 4 weeks
prior to enrollment.

9. All subjects must consent to provide archived tumor specimens for biomarker studies.

10. Subjects must have adequate organ function as indicated by the following laboratory
values:

1. Absolute neutrophil count (ANC) ≥ 1,500 /mL

2. Platelets ≥ 100,000 / mL

3. Hemoglobin ≥ 9 g/dL

4. Serum creatinine ≤ 1.5 X upper limit of normal (ULN)

5. Serum total bilirubin ≤ 1.5 × ULN

6. Aspartate aminotransferase (AST), (Serum glutamic oxaloacetic transaminase
[SGOT]), alanine aminotransferase (ALT), and (Serum glutamic pyruvic transaminase
[SGPT]) ≤ 2.5 × ULN OR ≤ 5 × ULN for subjects with liver metastasis

7. International Normalized Ratio (INR) and/or Prothrombin Time (PT) ≤ 1.5 × ULN

8. Activated Partial Thromboplastin Time (aPTT) ≤ 1.5 × ULN

9. Serum Albumin ≥ 3 gm/dL

11. Female subjects of childbearing potential (woman of childbearing potential [WOCBP])
must have a negative serum pregnancy test.

12. Subjects must use adequate contraception for the duration of the trial:

1. Male subjects must agree to use a highly effective contraception as detailed in
Appendix 4 of this protocol during the treatment period and for at least 3 months
after the last dose of trial intervention and refrain from donating sperm during
this period

2. A female subject is eligible to participate if she is not pregnant, not
breastfeeding, and at least one of the following conditions applies:

Not a WOCBP:

OR A WOCBP who agrees to follow the contraceptive guidance during the treatment period and
for at least 3 months after the last dose of trial intervention.

Exclusion Criteria:

Medical Conditions:

1. For Phase 2, diagnosis of any active malignancy other than pancreatic cancer within
the past 2 years (not including non-melanoma skin carcinoma, ductal carcinoma in situ
of the breast, or carcinoma in situ of uterine cervix treated with curative intent).

2. Any other medical, psychiatric, or social condition deemed by the Investigator to be
likely to interfere with a subject's rights, safety, welfare, or ability to sign
informed consent, cooperate and participate in the trial, or which would interfere
with the interpretation of the results.

Prior/Concomitant Therapy:

3. Prior exposure to gemcitabine (except when used as a radiosensitizer at least 6 months
prior to enrollment).

4. Any chemotherapy administered within 3 weeks or 5 half-lives (whichever is shorter)
before first dose of GP-2250; other anti-cancer therapy (including surgery,
radiotherapy, immunotherapy, hormone therapy, or targeted therapy) administered within
4 weeks or 5 half-lives (whichever is shorter) before the first dose of GP-2250; or
within 6 weeks in the case of certain therapies (mitomycin C and nitrosoureas).

Prior/Concurrent Clinical Trial Experience:

5. Investigational therapy administered within 4 weeks before the first dose of GP-2250.