I wonder why the Essiac tea would cause harm to the Iressa? I am not sure my grandma's doctor would even know what the tea is. I asked him about sugar at her last appointment and he said that no diets will help and that sugar does not fead cancer. I have heard many things to contradict that, so either he is uneducated or he doesn't like any alternative supplements. He is her oncologist too which makes me think she needs a different one.