Colo., May 14 /PRNewswire/ — Green tea consumption may promote
cancer-preventive effects in people at risk for cancer in addition to
supporting the medical treatment of some kinds of cancer, according to
a study in the May/June 2008 issue of Alternative Therapies in Health
and Medicine, on newsstands now.
In a study to
establish whether green tea has anti-cancerous potential in human
stomach and colon cancers, 6 cancerous and 6 non-cancerous adjacent
human gastric tissues and 7 cancerous and 7 non-cancerous adjacent
colon tissues were obtained from patients who underwent surgery for
stomach and colon cancer in the Ankara University Faculty of Medicine,
Department of General Surgery, Turkey. The tissues were treated with
aqueous green tea extract at 3 different final concentrations (0.05%,
0.5%, and 1.25%) for 1 hour. Activity assays were performed on the same
samples without green tea extract. Protein levels of the tissues were
studied and adjusted to equal concentrations.
oxidase (XO) and reduced adenosine deaminase (ADA) enzyme activities
were measured before and after the incubation period. Percentage
changes for the 3 different concentrations of green tea extract versus
no green tea extract were calculated.
cancerous and non-cancerous tissues, XO activities were found to
increase in correlation with increased extract concentrations in both
cancer types. Additionally, ADA activity was found to decrease in the
cancerous part of stomach tissue and to increase in the non-cancerous
“[While] further in vivo studies should be
conducted about the effects of green tea in colon and gastric cancers,
our study suggests that green tea consumption may promote
cancer-preventive effects in people at risk for cancer, in addition to
supporting the medical treatment of some kinds of cancers,” the authors
The full article is available at http://www.alternative-therapies.com/ .