Calcitriol, Cisplatin, and Gemcitabine Hydrochloride in Treating Patients With Advanced Solid Tumors That Cannot Be Removed by Surgery

PRIMARY OBJECTIVES:

I. To determine the maximum tolerated dose of oral calcitriol when combined with a standard
dose of gemcitabine (gemcitabine hydrochloride) and cisplatin in a 28-day cycle.

SECONDARY OBJECTIVES:

I. Describe the toxicity of this combination using Common Terminology Criteria for Adverse
Events (CTCAE) version 4.0.

II. Study the pharmacokinetics of calcitriol at the maximum tolerated dose (MTD) in an
expanded cohort of 6 patients.

III. Describe the clinical activity associated with this regimen in this advanced solid
tumor population.

OUTLINE:

Patients receive calcitriol orally (PO) on days 1, 2, 8, 9, 15 and 16; cisplatin
intravenously (IV) over 2 hours on day 2; and gemcitabine hydrochloride IV over 30 minutes
on days 2, 9, and 16. Courses repeat every 28 days in the absence of disease progression or
unacceptable toxicity.

After completion of study treatment, patients are followed up at 30 days.

Inclusion Criteria:

- Patients with a diagnosis of advanced unresectable non-hematological malignancy that
has no known standard of care or for which the use of gemcitabine plus cisplatin
constitutes a reasonable option

- Have an Eastern Cooperative Oncology Group (ECOG) Performance Status of 0-1

- White blood cell (WBC) >= 3.0 x 10^9/L

- Neutrophils >= 1.5 x 10^9/L

- Platelets >= 100 x 10^9/L

- Hemoglobin (Hgb) >= 10 g/dL

- Bilirubin =< institutional upper limit of normal (ULN)

- Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) < 2.5 x
institutional ULN unless metastatic to liver in which case AST and ALT should be < 5
x institutional ULN

- Creatinine =< 1.5 x institutional ULN

- Corrected calcium =< institutional ULN (corrected calcium = (4- Albumin) x 0.8 +
calcium)

- Patients of child-bearing potential must agree to use acceptable contraceptive
methods (e.g., double barrier) during treatment

- Patient or legal representative must understand the investigational nature of this
study and sign an Independent Ethics Committee/Institutional Review Board approved
written informed consent form prior to receiving any study related procedure

- No treatment with investigational agents within 4 weeks prior to study drug
administration, except patients receiving targeted therapies such as kinase
inhibitors with half-lives < 48 hours may be treated if > 14 days have elapsed after
the last dose and related toxicities have recovered to =< grade 1

- No chemotherapy within 4 weeks prior to study treatment administration; nitrosoureas
and mitomycin C are not allowed within 6 weeks prior to initiation of study treatment

- Palliative radiation, including whole brain radiation therapy (WBRT), is allowed
prior to enrollment as long as it is completed > 2 weeks from initiation of study
treatment, and provided patient has recovered from treatment toxicities to =< grade 1

- Patients should be able to take oral medications

Exclusion Criteria:

- Known hypersensitivity to any of the study drugs involved

- Brain metastases are excluded unless treated and shown to be controlled more than 1
month from after craniotomy or more than 2 weeks after gamma knife radiosurgery and
not associated with central nervous system (CNS) symptoms

- History of clinically significant hypercalcemia

- Evidence of nephrectomy

- History of (within 24 months prior to enrollment) of kidney, ureter, or bladder
stones with clinically significant sequelae (e.g. (painless gross hematuria; pain
with or without infection; hydronephrosis, etc); patients with otherwise stable
non-occluding kidney stones regardless of stone type incidentally found in computed
tomography (CT) scans are eligible; patients with prior history of uric acid stones
are eligible regardless of time of onset

- Unwillingness to stop calcium supplementation (during the first cycle of treatment)
or vitamin D supplementation throughout the study

- Thiazide (e.g HCTZ, Hydrochoirthiazide) or digoxin therapy (e.g Lanoxicaps, Lanoxin)

- Pregnant or nursing female patients.

- Unwilling or unable to follow protocol requirements

- Any condition which in the investigator's opinion deems the patient an unsuitable
candidate to receive study drug

- Received an investigational agent within 4 weeks prior to enrollment, except patients
receiving targeted therapies such as kinase inhibitors with half-lives < 48 hours may
be treated if > 14 days have elapsed after the last dose and related toxicities have
recovered to =< grade 1

- Nut allergy