Effect of Quercetin on Green Tea Polyphenol Uptake in Prostate Tissue From Patients With Prostate Cancer Undergoing Surgery
- Conditions
- Recurrent Prostate CancerStage IIA Prostate CancerStage IV Prostate CancerAdenocarcinoma of the ProstateStage IIB Prostate CancerStage III Prostate CancerStage I Prostate Cancer
- Interventions
- Dietary Supplement: green tea extractOther: placeboProcedure: therapeutic conventional surgeryOther: laboratory biomarker analysis
- Registration Number
- NCT01912820
- Lead Sponsor
- Jonsson Comprehensive Cancer Center
- Brief Summary
This randomized pilot phase I trial will evaluate if quercetin enhances the uptake of green tea polyphenols in the prostate tissue of men taking green tea extract and undergoing radical prostatectomy. Side effects of green tea extract and quercetin in combination with green tea extract will also be evaluated. In preclinical studies, green tea polyphenols have anticancer and cancer preventative effects in a number of malignancies. Likewise, in preclinical studies quercetin was found to enhance the anticancer effects of green tea. This trial is designed to translate these findings forward in a short-term human intervention trial.
- Detailed Description
PRIMARY OBJECTIVES:
I. To investigate the prostate tissue concentration of epigallocatechin gallate (EGCG), epicatechin gallate (ECG) and quercetin and their methylated metabolites in men scheduled for prostatectomy and consuming green tea (GT)extract (N=15) or GTextract with quercetin (N=15) for 3 weeks prior to prostatectomy.
II. To determine the concentration of EGCG, ECG, epigallocatechin (EGC), epicatechin (EC) and quercetin and the methylated metabolites in plasma collected before (T=0) and two hours (T=2) after the intake of the morning dose of GTextract and placebo or GTextract with quercetin during the third week of intervention.
III. To determine the effect of GTextract/quercetin intervention on reducing the enzyme activity and protein and gene expression of catechol-O-methyltransferase (COMT) and deoxyribonucleic (DNA) (cytosine-5) methyltransferase 1 (DNMT1) as well as protein and gene expression of multidrug resistance transport protein 1 (MRP1) in prostate tissue collected in specific aim 1 and COMT activity in erythrocytes from blood collected at baseline and week 3.
IV. To determine the inter-individual variation in genotype of COMT in buffy coat DNA.
OUTLINE: Patients are randomized to 1 of 2 treatment arms.
ARM I: Patients receive GT extract orally (PO) twice daily (BID) and quercetin PO BID for 3-6 weeks before undergoing prostatectomy.
ARM II: Patients receive GT extract PO BID and placebo PO BID for 3-6 weeks before undergoing prostatectomy.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- Male
- Target Recruitment
- 32
- Subjects consent to participate in the trial
- The subject has a diagnosis of adenocarcinoma of the prostate
- The subject is scheduled to undergo radical prostatectomy
- The subject agrees to stop consuming tea or tea-containing products and quercetin supplements throughout the entire intervention period except for the green tea extract and quercetin provided during study intervention
- History of hepatitis or liver dysfunction
- Ongoing alcohol abuse
- Significant medical or psychiatric conditions that would make the patient a poor protocol candidate
- Prior sensitivity or allergic reaction to tea, tea products or tea and quercetin supplements
- Allergies to multiple food items or nutritional supplements
- Taking luteinizing hormone-releasing hormone (LHRH) agonists, androgen receptor blocking agents, finasteride, or has undergone bilateral orchiectomy
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Arm && Interventions
Group Intervention Description Arm II (GT extract, placebo) placebo Patients receive GT extract PO BID and placebo PO BID for 3-6 weeks before undergoing prostatectomy. Arm I (quercetin, green tea extract) laboratory biomarker analysis Patients receive GT extract PO BID and quercetin PO BID for 3-6 weeks before undergoing prostatectomy. Arm II (GT extract, placebo) green tea extract Patients receive GT extract PO BID and placebo PO BID for 3-6 weeks before undergoing prostatectomy. Arm II (GT extract, placebo) laboratory biomarker analysis Patients receive GT extract PO BID and placebo PO BID for 3-6 weeks before undergoing prostatectomy. Arm II (GT extract, placebo) therapeutic conventional surgery Patients receive GT extract PO BID and placebo PO BID for 3-6 weeks before undergoing prostatectomy. Arm I (quercetin, green tea extract) therapeutic conventional surgery Patients receive GT extract PO BID and quercetin PO BID for 3-6 weeks before undergoing prostatectomy. Arm I (quercetin, green tea extract) green tea extract Patients receive GT extract PO BID and quercetin PO BID for 3-6 weeks before undergoing prostatectomy. Arm I (quercetin, green tea extract) quercetin Patients receive GT extract PO BID and quercetin PO BID for 3-6 weeks before undergoing prostatectomy.
- Primary Outcome Measures
Name Time Method Green tea polyphenols, quercetin and their metabolite concentration in blood and prostate tissue On the day of surgery Means and standard deviation will be calculated and the statistical difference between treatment with GTextract + quercetin compared to GTextract + placebo will be determined using Student's t-test computed by one-way analysis of variance models.
- Secondary Outcome Measures
Name Time Method Protein and gene expression of MRP1 in prostate tissue Day of surgery Protein and gene expression of DNMT1 in prostate tissue Day of surgery Protein and gene expression of COMT in prostate tissue Day of surgery COMT activity in red blood cells Week 3 Genotype of COMT (high [H]/H, low [L]/L or H/L) Week 3 Gene-association analyses will be conducted for COMT polymorphic variants within each intervention group using SAS Genetics, version 9.1
Trial Locations
- Locations (2)
Jonsson Comprehensive Cancer Center
🇺🇸Los Angeles, California, United States
Veterans Administration Los Angeles Healthcare System
🇺🇸Los Angeles, California, United States