Pharmacy Medical News about Green tea, Cancer prevention, Catechins, Antioxidants

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Green tea (Camellia sinensis) for the prevention of cancer
Cochrane Reviews, 07/09/09

Boehm K et al. - There is insufficient and conflicting evidence to give any firm recommendations regarding green tea consumption for cancer prevention. The results need to be interpreted with caution and their generalisability is questionable, as the majority of included studies were carried out in Asia where the tea drinking culture is pronounced. Drinking green tea appears to be safe at moderate, regular and habitual use.

Methods

An assessment of any associations between green tea consumption and the risk of cancer incidence and mortality
Search of eligible studies up to Jan 2009 in CENTRAL, MEDLINE, EMBASE, Amed, CancerLit, Psych INFO and Phytobase and reference lists of previous reviews
Prospective, controlled interventional studies and observational studies were included

Results

51 studies with more than 1.6 million participants, mainly of observational nature were included in this systematic review
Studies looked for an association between green tea consumption and cancer of:
- digestive tract, gynecological cancer including breast cancer,
- urological cancer including prostate cancer, lung cancer and
- cancer of the oral cavity
27 studies tried to establish an association between green tea consumption and cancer of the digestive tract, mainly of the upper gastrointestinal tract
5 with breast cancer; 5 with prostate cancer; 3 with lung cancer; 2 with ovarian cancer; 2 with urinary bladder cancer; 1 with oral cancer
3 further studies included pts with various cancer diagnoses
Results from some studies were contradictory, with limited evidence, and were conflicting
However, there was limited to moderate evidence that the consumption of green tea reduced the risk of some cancers