Green Tea Anticancer Mechanisms in Smokers
Sleutelwoorden
Abstract
Omschrijving
Green tea contains phytochemicals, especially flavonoids. Phytochemicals are not absolutely required for normal functions, but may confer health benefits such as antioxidant actions. One can live without phytochemicals, but one may live longer and better with them. The phytochemicals in tea have been proposed to inhibit cancer onset via several different mechanisms. An obvious question is: Can anti-cancer actions of green tea be duplicated by black tea, which in the USA, is consumed more than green tea? The question remains unanswered, and will not be addressed by this project since many questions about green tea have not been answered yet. The contents of both type teas overlap in flavonoids, but green tea has more of the agents thought to be most effective. For example, some of the research cited below uses the flavonoid epigallocatechin gallate. Green tea has 5 times more of this flavonoid than black tea.
This study has two purposes. First, a case will be made that green tea may have several anti-cancer mechanisms, but this contention is not well confirmed by human intervention studies. This case will be made by addressing four questions. Second, justification will be given for the choice of mechanisms to be examined in this project's human intervention.
Datums
| Laatst geverifieerd: | 03/31/2015 |
| Eerste ingediend: | 06/22/2010 |
| Geschatte inschrijving ingediend: | 07/12/2010 |
| Eerst geplaatst: | 07/13/2010 |
| Laatste update ingediend: | 04/19/2015 |
| Laatste update geplaatst: | 04/20/2015 |
| Werkelijke startdatum van het onderzoek: | 05/31/2010 |
| Geschatte primaire voltooiingsdatum: | 07/31/2013 |
| Geschatte voltooiingsdatum van het onderzoek: | 07/31/2013 |
Conditie of ziekte
Interventie / behandeling
Dietary Supplement: Green Tea
Other: No Green Tea
Fase
Armgroepen
| Arm | Interventie / behandeling |
|---|---|
| Experimental: Green Tea 4 cups daily of green tea for 6 weeks | Dietary Supplement: Green Tea Green Tea 4 cups daily |
| Placebo Comparator: No Green Tea 4 cups daily of placebo tea for 6 weeks | Other: No Green Tea 4 cups placebo tea for 6 weeks |
Geschiktheidscriteria
| Leeftijden die in aanmerking komen voor studie | 23 Years Naar 23 Years |
| Geslachten die in aanmerking komen voor studie | All |
| Accepteert gezonde vrijwilligers | Ja |
| Criteria | Inclusion Criteria: - Healthy 23-40 year old males and non-pregnant females, who are moderately heavy smokers (1-1.75 packs/day, > 2 years) Exclusion Criteria: - Habitual tea intake - Habitual flavonoid supplementation - Soy product intake over twice a week (soy is high in flavonoids). - Pulmonary diseases - Chronic or acute infection - Admission of heavy alcohol intake (> 14 beers or drinks a week) - Body mass index (BMI) > 30 (moderately overweight subjects will be taken) - Abnormal EKG - History of heart or other major health problems (ie arthritis, diabetes). - Subjects with slightly high blood pressure will be eligible for the project, but more severe hypertension (>150/100) |
Resultaat
Primaire uitkomstmaten
1. Antioxidant effects of green tea versus placebo consumption. [Measured at post treatment]
Secundaire uitkomstmaten
1. Non-antioxidant, cancer-relevant effects of green tea consumption [Measured at pre-treatment and post treatment]
