Mistletoe therapy is a type of treatment for cancer used by well trained doctors. This therapy was developed in Switzerland by Rudolf Steiner at the beginning of the 20th century. Treatment with Mistletoe aims at intensifying the body’s own forces against the cancer cell’s tendency towards autonomy. Mistletoe is a complementary rather than an alternative medicine. It is frequently prescribed in Europe by medical doctors including oncologists in addition to the conventional cancer therapies, radiation, surgery and chemotherapy. Nowadays in Europe, mistletoe is a key component in conventional cancer therapy.