Comment by ucaetano

Keep in mind that you'd need to drink about 1 gallon of green tea every day (which would cause nausea and pain) to have an increase in the EGCG levels in your blood of less than 60%.

http://clincancerres.aacrjournals.org/content/9/9/3312.long

So it seems unlikely that drinking green tea would be a viable treatment.