Although used at most clinics, would be considered an adjunctive therapy. Psychological counseling, support groups and even psychotherapy make up a critically important aspect of therapy in the world’s most successful cancer treatment centers. Some doctors have reported that a traumatic psychological event in a person’s life may trigger the appearance of cancer one to two years later. Music, meditation, relaxation techniques, and stress reduction have proven to significantly enhance the power of the immune system. Some therapists include emotional and even spiritual counseling, not only for the person’s regular life, but in dealing with the trauma of cancer. Biofeedback can also be used, where a person visualizes the immune cells of the body attacking the cancer cells.