Clinical trial NCT00550563: DNA Changes That Affect Vitamin D Metabolism in Patients With Colorectal Cancer Receiving Vitamin D Supplements
Official title: Identification of 24-Hydroxylase Polymorphisms and Splicing Variants That Modulate Vitamin D Oxidative Metabolism and Serum Pharmacokinetics in Patients With Colorectal Cancer on Cholecalciferol Therapy
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Colorectal Cancer
Keywords: recurrent colon cancer
stage I colon cancer
stage II colon cancer
stage III colon cancer
stage IV colon cancer
recurrent rectal cancer
stage I rectal cancer
stage II rectal cancer
stage III rectal cancer
stage IV rectal cancer
Lead sponsor: Roswell Park Cancer Institute
Sponsor class: OTHER
First posted: 2007-10-30
Enrollment: 50
Sex: ALL
Minimum age (years): 18
Maximum age (years): 120
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: SUPPORTIVE_CARE

Brief summary: RATIONALE: Studying samples of blood from patients with cancer in the laboratory may help doctors learn more about changes that occur in DNA and identify biomarkers related to cancer.

PURPOSE: This clinical trial is studying changes in DNA that affect vitamin D metabolism in patients with colorectal cancer receiving vitamin D supplements.

Detailed description: OBJECTIVES:

* To identify CYP24 single nucleotide polymorphisms (SNPs) using peripheral blood mononuclear cell genomic DNA from patients with colorectal cancer receiving cholecalciferol supplementation.
* To evaluate the effects of these CYP24 SNPs on baseline serum vitamin D_3 metabolites (25-D_3, 24,25-D_3, and 1,25-D_3), and parathyroid hormone levels (PTH).
* To evaluate the effects of these CYP24 SNPs on serum vitamin D_3 metabolites and PTH levels during cholecalciferol treatment.
* To examine CYP24 splicing, protein expression, and enzyme activity at baseline and during cholecalciferol treatment.
* To determine the relationship, if any, between serum cholecalciferol pharmacokinetic parameters and CYP24 SNPs, splicing variants, and enzyme activity.

OUTLINE: Patients receive oral cholecalciferol 2000 IU once daily for 1 year. Patients without response to vitamin D supplementation (serum 25-D_3 level \< 32 ng/mL) by 6 months will have their cholecalciferol dose increased to 4000 IU once daily.

Blood is collected at baseline and on days 14, 30, 60, 90, 180, 270, and 360. Peripheral blood mononuclear cells for CYP24 genotyping, protein expression, enzyme activity, and splicing variants are analyzed by polymerase chain reaction (PCR), western blot, high performance liquid chromatography, and reverse transcriptase PCR, respectively. Serum is analyzed for vitamin D_3 metabolite levels (by radioimmunoassay), calcium (to monitor for hypercalcemia), and parathyroid hormone assays (to measure vitamin D effect).

Eligibility criteria: DISEASE CHARACTERISTICS:

* Prior or current documented diagnosis of colorectal cancer

  * All stages
* 25OH-D3 level \< 50 ng/mL

PATIENT CHARACTERISTICS:

* ECOG performance status 0-2
* Life expectancy \> 6 months
* Serum creatinine \< 2.0 mg/dL
* Serum bilirubin \< 2.0 mg/dL
* No prior or current hypercalcemia (defined as albumin corrected serum calcium \< 10.2 mg/dL)
* No known contraindication for vitamin D supplementation
* No genitourinary stones within the past 5 years
* No severe comorbid conditions such as uncompensated heart failure or active infection

PRIOR CONCURRENT THERAPY:

* No supplemental vitamin D beyond what is provided through the study
* At least 2 months since prior vitamin D supplementation exceeding 800 International Units (IU)

  * Nondietary vitamin D supplements should not have exceeded 800 IU/day within the past 2 months

Primary outcomes:
measure: Identification of CYP24 single nucleotide polymorphisms (SNPs)
timeFrame: Baseline, days 14, 30, 60, 90, 180, 270, 360
measure: Effect of CYP24 SNPs on baseline serum vitamin D3 metabolites (25-D3, 24,25-D3, and 1,25-D3), and parathyroid hormone levels (PTH)
timeFrame: At baseline
measure: Effect of CYP24 SNPs on serum vitamin D3 metabolites and PTH levels during cholecalciferol treatment
timeFrame: Baseline, days 14, 30, 60, 90, 180, 270, 360
measure: CYP24 splicing, protein expression, and enzyme activity at baseline and during cholecalciferol treatment
timeFrame: Baseline, days 14, 30, 60, 90, 180, 270, 360
measure: Relationship between serum cholecalciferol pharmacokinetic parameters and CYP24 SNPs, splicing variants, and enzyme activity
timeFrame: Baseline, days 14, 30, 60, 90, 180, 270, 360
Secondary outcomes:
Other outcomes:
Locations:
city: Buffalo
country: United States
facility: Roswell Park Cancer Institute
state: New York
Study officials:
affiliation: Roswell Park Cancer Institute
name: Marwan Fakih, MD
role: PRINCIPAL_INVESTIGATOR
References: