Colorectal Cancer
Conditions
Keywords
colon cancer, rectal cancer
Brief summary
RATIONALE: Vitamin E may help prevent the development of cancer. Studying samples of tissue from patients with colorectal cancer who receive Vitamin E before undergoing surgery in the laboratory may help doctors learn more about how Vitamin E changes biomarkers related to colorectal cancer. PURPOSE: This randomized early phase I trial is studying giving vitamin E supplements to see how it affects biomarkers in patients undergoing surgery for colorectal cancer.
Detailed description
OBJECTIVES: * Determine the effect of high γ-tocopherol vitamin E mixture supplementation on plasma levels of α-, γ-, and δ-tocopherols, and prostaglandin E\_2 in patients planning to undergo surgery for colorectal cancer by comparing the blood samples collected before and after the supplementation in each of the groups and analyzing levels of tocopherols and their metabolites in urine samples. * Test the hypothesis that the supplementation reduces oxidative and nitrosative stress by measuring plasma levels of F\_2-isoprostane, C-reactive protein, and 3-nitrotyrosine as well as urinary levels of 8-hydroxy-2-deoxyguanosine (8-OHdG). * Determine the levels of α-, γ-, and δ-tocopherols in colon tissues and analyze immunohistochemically for cell proliferation, apoptosis, β-catenin localization, RXR expression, cyclooxygenase-2, 8-OHdG, and 3-nitrotyrosine levels in colon cancer tissue slides. OUTLINE: This is a multicenter study. The first 5 patients receive no supplements (to establish laboratory standards), all other patients are randomized to 1 of 3 treatment arms. * Arm I: Patients receive no intervention before undergoing planned surgery. * Arm II: Patients receive oral high γ-tocopherol vitamin E mixture supplementation once daily for 1 week before undergoing planned surgery. * Arm III: Patients receive oral high γ-tocopherol vitamin E mixture supplementation once daily for 2 weeks before undergoing planned surgery. Blood and urine samples are collected at baseline and on the day of surgery for tocopherol and biomarker analysis. A sample of colon tissue is removed during standard surgical resection for chemical analysis. Plasma, tumor tissue, and nontumorous tissues are analyzed for levels of F\_2-isoprostane, 8-OHdG, 3-nitrotyrosine, and prostaglandin E\_2 via enzyme immunoassays and for levels of α-, γ-, and δ-tocopherols via HPLC.
Interventions
DIETARY_SUPPLEMENTvitamin E
Given orally
OTHERlaboratory biomarker analysis
All patients undergo biomarker analyses
Sponsors
National Cancer Institute (NCI)
Rutgers Cancer Institute of New Jersey
Rutgers, The State University of New Jersey
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
DISEASE CHARACTERISTICS: * Suspected or confirmed colorectal cancer meeting the following criteria: * Scheduled for surgery as the initial treatment * Referred to the Cancer Institute of New Jersey or the Robert Wood Johnson University Hospital * No requirement for urgent surgery (i.e., surgery that cannot wait for 2 weeks) PATIENT CHARACTERISTICS: * Not pregnant or nursing * Negative pregnancy test * Patients deemed in adequate health to undergo colon resection by their surgeon * No uncontrolled diabetes, uncontrolled BP, chronic congestive heart failure, or history of renal insufficiency * No personal or family history of bleeding disorders * No known history of problems absorbing fats (e.g., Crohn disease, cystic fibrosis) PRIOR CONCURRENT THERAPY: * See Disease Characteristics * No prior chemotherapy or radiotherapy for the treatment of this cancer * More than 2 weeks since prior NSAIDs or corticosteroids * No concurrent colestipol or orlistat * No concurrent warfarin or dicumarol * No concurrent supplementation of vitamin E * A multivitamin containing ≤ 60 IU vitamin E allowed
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Plasma and urine levels of α-, γ-, and δ-tocopherols, and prostaglandin E2 | 4 years |
| Plasma levels of F2-isoprostane, C-reactive protein, and 3-nitrotyrosine and urinary levels of 8-hydroxy-2-deoxyguanosine (8-OHdG) | 4 years |
| Presence in colon tissue of α-, γ-, and δ-tocopherols, cell proliferation and apoptosis indicators, β-catenin localization, RXR expression, and cyclooxygenase-2, 8-OHdG, and 3-nitrotyrosine levels | 4 years |
Countries
United States
Outcome results
None listed