Description Module
The Description Module contains narrative descriptions of the clinical trial, including a brief summary and detailed description. These descriptions provide important information about the study's purpose, methodology, and key details in language accessible to both researchers and the general public.
Description Module path is as follows:
Study -> Protocol Section -> Description Module
Description Module
Ignite Creation Date:
2025-12-25 @ 4:48 AM
Ignite Modification Date:
2025-12-25 @ 4:48 AM
NCT ID:
NCT00905918
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.
Study:
NCT00905918
Study Brief:
Protocol Section:
NCT00905918