My friend died of breast cancer , she refuse to take synthetic drugs   

My new friend just passed away because of breast cancer leaving her husband and three little kids. She refused to take medicines prescribed by doctors, instead used food supplements and herbal products but not on a regular basis. She agreed to undergo chemotheraphy only when she was at stage four which I think has already reached the terminal stage. And I know a lot of people who has breast cancer who do not want to use synthetic drugs but instead prefer to use herbal products/medicines. Is there really an herbal product that is proven scientifically that can cure breast cancer?
Or any suggestions how to manage breast cancer without using synthetic drugs. Please share so I could also share it with these people. And you can also give your ideas on how to prevent this dreadful disease. God Bless and happy mylotting......