How to drink green tea & other issues
 

http://www.cancerdecisions.com/120306.html

By the way,green tea (or extracts) are not likely to interfere with most chemo drugs which use the P450 (CYP3A4) metabolizing enzyme according to this small study on healthy people:
http://dmd.aspetjournals.org/cgi/content/full/32/9/906