Non-doctor health professionals that may be a part of the orthopedics team include: 1  Athletic trainers. 2  Counselors. 3  Nurse practitioners. 4  Physical therapists. 5  Physician assistants. 6  Psychologists. 7  Social workers. 8  Vocational workers.
The main response of the immune system to tumors is to destroy the abnormal cells using killer T cells, sometimes with the assistance of helper T cells. Tumor antigens are presented on MHC class I molecules in a similar way to viral antigens. This allows killer T cells to recognize the tumor cell as abnormal.
Once activated, helper T cells start to divide and to produce proteins that activate B and T cells as well as other immune cells. The killer T cell is specialized in attacking cells of the body infected by viruses and sometimes also by bacteria. It can also attack cancer cells. The killer T cell has receptors that are used to search each cell that it meets.