Clinical trial · Interventional
Green Tea Extract (Polyphenon E) in Preventing Cancer in Healthy Participants
Phase I Drug Interaction Clinical Study of Polyphenon E
NCT00091325CI-TRIAL-00003039completedPhase 1ClinicalTrials.gov clinicaltrialsProvenance
- Source
- ClinicalTrials.gov
- Retrieved
- Sep 8, 2026
- Layer
- normalized (units and labels harmonized; values unchanged)
- Run
- ING-CLINICALTRIALS-20260908-000001
Summary
Brief summary (as posted)
RATIONALE: Green tea extract (Polyphenon E) contains ingredients that may prevent the development of cancer. PURPOSE: This phase I trial is studying how well green tea extract works in preventing cancer in healthy participants.
Conditions
Conditions (1)
Free-text conditions as registered, with the CancerIndex entity they were reconciled to and the match type.
| Condition (as posted) | Mapped entity | Match | Confidence |
|---|---|---|---|
| Unspecified Adult Solid Tumor, Protocol Specific | Adult Solid Neoplasm | ALIAS | 0.85 |
Interventions
Interventions (1)
| Intervention | Type | Mapped drug | Match |
|---|---|---|---|
| defined green tea catechin extract | Dietary Supplement | — | UNRESOLVED |
Eligibility
Eligibility (as posted)
- Sex
- All
- Minimum age
- 18 Years
Show eligibility criteria text
DISEASE CHARACTERISTICS:
* Healthy individuals
* Non-smokers
* More than 1 year since smoking cessation
* No concurrent smokers
* No regular consumption of large amounts of alcohol
* On average, ≤ 3 alcoholic drinks per week
* Consumes \< 6 cups or glasses of tea per week
PATIENT CHARACTERISTICS:
Age
* 18 and over
Performance Status
* Not specified
Life expectancy
* Not specified
Hematopoietic
* Not specified
Hepatic
* Bilirubin ≤ 2.0 mg/dL
* AST or ALT ≤ 2 times normal
* Alkaline phosphatase ≤ 2 times normal
Renal
* Creatinine ≤ 1.5 mg/dL
Cardiovascular
* Resting systolic blood pressure ≥ 100 mm Hg
* No hypertension or hypercholesterolemia requiring unscheduled medical visits or changes in treatment within the past 3 months
Other
* Not pregnant or nursing
* Negative pregnancy test
* Fertile patients must use effective contraception
* Willing to refrain from tea and related products and oral herbal/botanical supplements during study participation
* Willing to limit the consumption of cruciferous vegetables to ≤ once a week during study participation
* Willing to refrain from caffeine-containing food or beverages (e.g., coffee, colas, chocolate, or over-the-counter medications) for 72 hours before, during, and for 8 hours after study drug administration
* Willing to refrain from food items that affect drug or carcinogen metabolizing enzymes (e.g., grapefruit, grapefruit juice, cruciferous vegetables, and food cooked over charcoal) for 72 hours before, during, and for 8 hours after study drug administration
* No difficulty swallowing capsules or tablets
* No metabolic disorder known to affect study drugs
* No other serious acute or chronic disease (e.g., type I or II diabetes, cystic fibrosis, or active infection)
* No known hypersensitivity to green tea or probe drugs (e.g., caffeine, dextromethorphan, losartan, or buspirone)
* No invasive cancer (i.e., non-skin cancer) within the past 5 years
PRIOR CONCURRENT THERAPY:
Biologic therapy
* Not specified
Chemotherapy
* Not specified
Endocrine therapy
* Not specified
Radiotherapy
* Not specified
Surgery
* Not specified
Other
* More than 3 months since prior participation in another clinical intervention study
* No concurrent medications or supplements that are known P450 enzyme inducers or inhibitorsReferences
Publications (0)
Data not yet available
No reference posted for this study.