Osteogenic Sarcoma (Osteosarcoma)
Osteosarcoma is the most common type of bone cancer. It usually starts in osteoblasts, which are a type of bone cell that grows into new bone tissue. Osteosarcoma is most common in teenagers and young adults. It commonly forms in the ends of the long bones of the body, which include bones of the arms and legs. In children and teenagers, it often develops around the knee. Rarely, osteosarcoma may be found in soft tissue or organs in the chest or abdomen. Malignant fibrous histiocytoma (MFH) of bone is a rare tumor of the bone. It is treated like osteosarcoma.
Staging of Osteogenic Sarcoma (Osteosarcoma)
Osteosarcoma and MFH are described as either localized or metastatic.
Localized osteosarcoma or MFH has not spread out of the bone where the cancer started. There may be one or more areas of cancer in the bone that can be removed during surgery.
Metastatic osteosarcoma or MFH has spread from the bone in which the cancer began to other parts of the body. The cancer most often spreads to the lungs. It may also spread to other bones
Treatment of Osteogenic Sarcoma (Osteosarcoma)
Four types of standard treatment are used:
Surgery to remove the entire tumor will be done when possible. Chemotherapy may be given first, to make the tumor smaller so less tissue and bone needs to be removed. This is called neoadjuvant chemotherapy.
The following types of surgery may be done:
Wide local excision: Surgery to remove the cancer and some healthy tissue around it.
Limb-sparing surgery: Removal of the tumor in a limb (arm or leg) without amputation, so the use and appearance of the limb is saved. Most patients with osteosarcoma in a limb can be treated with limb-sparing surgery. The tumor is removed by wide local excision. Tissue and bone that are removed may be replaced with a graft using tissue and bone taken from another part of the patient's body, or with an implant such as artificial bone. If a fracture is found at diagnosis or during chemotherapy before surgery, limb-sparing surgery may still be possible in some cases. If the surgeon is not able to remove all of the tumor and enough healthy tissue around it, an amputation may be done.
Amputation: Surgery to remove part or all of an arm or leg. This may be done when it is not possible to remove all of the tumor in limb-sparing surgery. The patient may be fitted with a prosthesis (artificial limb) after amputation.
Rotationplasty: Surgery to remove the tumor and the knee joint. The part of the leg that remains below the knee is then attached to the part of the leg that remains above the knee, with the foot facing backward and the ankle acting as a knee. A prosthesis may then be attached to the foot.
Studies have shown that survival is the same whether the first surgery done is a limb-sparing surgery or an amputation. Even if the doctor removes all the cancer that can be seen at the time of the surgery, some patients may be given chemotherapy or radiation therapy after surgery to kill any cancer cells that are left. Treatment given after the surgery, to lower the risk that the cancer will come back, is called adjuvant therapy.
Chemotherapy is a cancer treatment that uses drugs to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. When chemotherapy is taken by mouth or injected into a vein or muscle, the drugs enter the bloodstream and can reach cancer cells throughout the body (systemic chemotherapy). When chemotherapy is placed directly into the cerebrospinal fluid, an organ, or a body cavity such as the abdomen, the drugs mainly affect cancer cells in those areas (regional chemotherapy). Combination chemotherapy is the use of more than one anticancer drug. The way the chemotherapy is given depends on the type and stage of the cancer being treated.
Radiation therapy is a cancer treatment that uses high-energy x-rays or other types of radiation to kill cancer cells or keep them from growing. There are two types of radiation therapy. External radiation therapy uses a machine outside the body to send radiation toward the cancer. Internal radiation therapy uses a radioactive substance sealed in needles, seeds, wires, or catheters that are placed directly into or near the cancer. The way the radiation therapy is given depends on the type and stage of the cancer being treated.
Osteosarcoma and MFH cells are not killed easily by radiation therapy. It may be used when a small amount of cancer is left after surgery or used together with other treatments.
Samarium is a radioactive drug that targets areas where bone cells are growing, such as tumor cells in bone. It helps relieve pain caused by cancer in the bone and it also kills blood cells in the bone marrow. Treatment with samarium may be followed by stem cell transplant. Before treatment with samarium, stem cells (immature blood cells) are removed from the blood or bone marrow of the patient and are frozen and stored. After treatment with samarium is complete, the stored stem cells are thawed and given back to the patient through an infusion. These reinfused stem cells grow into (and restore) the body's blood cells.
New types of treatment are being tested in clinical trials.
Targeted therapy is a treatment that uses drugs or other substances to find and attack specific cancer cells without harming normal cells. Several types of targeted therapy are being studied for osteosarcoma.
Angiogenesis inhibitor therapy: Drugs that stop cells from dividing and prevent the growth of new blood vessels that tumors need to grow.
Viral therapy: Use of a virus that has been changed in the laboratory to find and destroy cancer cells without harming healthy cells.
Monoclonal antibody therapy: A cancer treatment that uses antibodies made in the laboratory, from a single type of immune system cell. These antibodies can identify substances on cancer cells or normal substances that may help cancer cells grow. The antibodies attach to the substances and kill the cancer cells, block their growth, or keep them from spreading. Monoclonal antibodies are given by infusion. They may be used alone or to carry drugs, toxins, or radioactive material directly to cancer cells.
Kinase inhibitor therapy: A drug that blocks a protein needed for cancer cells to divide.
For some patients, taking part in a clinical trial may be the best treatment choice. Clinical trials are part of the cancer research process. Clinical trials are done to find out if new cancer treatments are safe and effective or better than the standard treatment.
Search for clinical trials in Georgia.
Adapted from the National Cancer Institute's PDQ Database: http://www.cancer.gov/cancertopics/pdq/treatment/osteosarcoma/Patient/page1. (Accessed July 2016)