Green Tea or Polyphenon E in Preventing Lung Cancer in Former Smokers With Chronic Obstructive Pulmonary Disease
RATIONALE: Chemoprevention is the use of certain substances to keep cancer from forming, growing, or coming back. The use of green tea or polyphenon E may prevent cancer from forming in former smokers with chronic obstructive pulmonary disease.
PURPOSE: This randomized phase II trial is studying how well green tea or polyphenon E work in preventing lung cancer in former smokers with chronic obstructive pulmonary disease.
|Lung Cancer Prevention||Dietary Supplement: green tea Drug: Polyphenon E Other: placebo||Phase 2|
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Prevention
|Official Title:||Chemoprevention of Lung Carcinogenesis Using Green Tea: Phase IIb Randomized, Double-Blinded, Placebo Controlled Trial of Green Tea and Polyphenon E in Former Smokers With Chronic Obstructive Lung Disease (COPD)|
- Change in Urinary 8-hydroxydeoxyguanosine Levels [ Time Frame: Baseline and 6 months ]the urinary concentrations of 8-hydroxydeoxyguanosine were normalized by the urinary creatinine concentrations to correct for variations in urine dilution/production and the change in urinary 8-hydroxydeoxyguanosine levels was calculated as the 6 months levels minus the baseline levels
- Change in Urinary 8-F2-isoprostanes Levels [ Time Frame: Baseline and 6 months ]the urinary concentrations of 8-F2-isoprostanes were normalized by the urinary creatinine concentrations to correct for variations in urine dilution/production and the change in urinary 8-F2-isoprostanes levels was calculated as 6 months levels minus baseline levels
|Study Start Date:||May 2004|
|Primary Completion Date:||March 2009 (Final data collection date for primary outcome measure)|
Experimental: Green Tea
Patients receive green tea beverage and placebo capsules for 6 months.
Dietary Supplement: green tea
Experimental: Polyphenon E
Patients receive placebo beverage and Polyphenon E capsules daily for 6 months.
Drug: Polyphenon E
Placebo Comparator: Placebo
Patients receive placebo beverage and placebo capsules daily for 6 months.
- Evaluate the effects of high-level oral consumption of defined green tea (four 12-oz servings/day) or polyphenon E capsules (4 capsules/day) on markers of cellular oxidative damage, as measured by 8-hydroxydeoxyguanosine (8-OHdG) and 8-F_2-isoprostanes (8-epi-PGF2) in former smokers with chronic obstructive pulmonary disease.
- Evaluate the effects of high-level oral consumption of defined green tea or polyphenon E capsules on body antioxidant status (carotenoids, vitamins A and E, ascorbic acid [vitamin C] and antioxidant enzymes [catalase and glutathione peroxidase]) in blood in these patients.
- Evaluate the effects of high-level oral consumption of defined green tea or polyphenon E capsules on gene expression of markers of proliferation and apoptosis in induced sputum in these patients.
- Evaluate the effects of high-level oral consumption of defined green tea or polyphenon E capsules on lung function in these patients.
- Evaluate the relative adherence to use of green tea beverage vs polyphenon E capsules in these patients.
OUTLINE: This is a randomized, double-blind, placebo-controlled study. Patients are stratified according to gender and inhaled steroid usage (yes vs no).
All patients receive placebo tea beverage and placebo capsules 4 times a day for 2 weeks. Patients are randomized to 1 of 3 treatment arms after successful completion of the 2-week period.
- Arm I (green tea beverage): Patients receive oral green tea beverage and oral polyphenon E placebo daily for 6 months.
- Arm II (green tea capsule [polyphenon E]): Patients receive oral green tea beverage placebo and oral polyphenon E daily for 6 months.
- Arm III (placebo): Patients receive oral green tea beverage placebo and oral polyphenon E placebo daily for 6 months.
Patients undergo blood, urine, exhaled breath condensate (EBC), induced sputum, and buccal cell collection at baseline and periodically during study for biomarker/laboratory analysis. Blood samples are analyzed for 8-hydroxydeoxyguanosine (8-OHdG), glutathione peroxidase, and catalase. Urine is examined for F_2-isoprostanes, 8-OHdG, and tea polyphenols. Induced sputum broncho-epithelial cells are analyzed for gene expression of genes implicated in cellular growth and apoptotic pathway via reverse transcriptase-polymerase chain reaction. EBC samples are examined for F_2-isoprostane levels. Buccal cells are stored for future analysis.
PROJECTED ACCRUAL: A total of 195 patients will be accrued for this study.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00363805
|United States, Arizona|
|Virginia G. Piper Cancer Center at Scottsdale Healthcare - Shea|
|Tucson, Arizona, United States, 85258|
|Veterans Affairs Medical Center - Tucson|
|Tucson, Arizona, United States, 85723|
|Arizona Cancer Center at University of Arizona Health Sciences Center|
|Tucson, Arizona, United States, 85724-5024|
|Principal Investigator:||Iman Hakim, MD, PhD, MPH||University of Arizona|