A new study, led by Dr. Radha Maheshwari, professor of Pathology at the Uniformed Services University of the Health Sciences (USU) and Rajesh Loganathan Thangapazham, a graduate student, has shown that green tea possesses antitumor effect in breast cancer cells.
Dr. Maheshwari's study found that green tea can inhibit the invading capacity of the breast cancer cells, and has also identified the mechanisms involved in death inducing and invasion inhibiting effects of green tea.
Epidemiological studies have also suggested that the risk of breast cancer is found to be less in Asian countries consuming green tea. These studies have greater clinical significance since the ability of these phytochemicals to activate anti-cancer program of tumour cells might determine the success of chemotherapy.
A study by Dr. Maheshwari that was published earlier this year in Cancer Letters revealed that green tea is effective in delaying tumour incidence as well as in reducing the tumour burden. Green tea was found to inhibit growth of tumours as well as induce death of breast cancer cells.
Cancer is caused by the increased proliferation of cells, which group and form a lump called tumour. Tumours can be either benign or malignant. Cells from malignant tumours break away from the original tumour and spread to other parts of the body growing and forming new tumours.
They can invade, penetrate into blood and lymphatic vessels, circulate via the bloodstream and can grow in a normal organ or tissue anywhere in the body.
Unfortunately treatment options for metastasis are very limited and usually represent the end stage of the disease. Unlike malignant tumours, benign tumours do not invade and, with very rare exceptions, are not life threatening.
Chemoprevention broadly implies the use of a chemical substance of either natural or synthetic origin, to prevent, hamper, arrest or reverse a disease. Phytochemicals are plant based non-nutritive components with substantial medicinal properties.
The study will be published in the Journal of Cancer Biology and Therapy, December 2007, Volume 6, Issue 12.