link [www.cancerhelp.org.uk]
"A word of caution
Only you can decide whether or not to use alternative cancer therapies such as Essiac. But we don't recommend using any alternative therapies, including Essiac, in place of conventional treatment. There is often little (if any) scientific or medical evidence to back up the claims made by their promoters. If you have cancer, using unproven methods instead of conventional medical treatment can be very harmful to you.
Whenever we put up information on alternative treatments that have not been properly tested, we receive angry emails that say we are trying to prevent people with cancer from getting effective treatment. This is not what we want to do. We are concerned that potential cures, like this one, are often sold for a great deal of money and lack scientific evidence to prove they help. It is not in the interests of drug companies or research organisations such as ours to ignore potential new treatments. Thousands and thousands of compounds are screened every year to try to find those that might be the basis of effective treatments. If Essiac had any therapeutic benefit, drug companies would have developed it into a treatment long ago."