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What is osteosarcoma?

Osteosarcoma├é  is a disease in which cancer (malignant) cells are found in the bone. It is the most common type of bone cancer. Osteosarcoma most often occurs in adolescents and young adults. In children and adolescents, tumors appear most often in the bones around the knee. The symptoms and chance for recovery in children and adolescents appear to be the same.
If a patient has symptoms (such as pain and swelling of a bone or a bone region), a doctor may order x-rays and blood tests. The orthopedic oncologist may cut out a piece of tissue from the affected area. This is called a biopsy. The tissue will be looked at under a microscope to see if there are any cancer cells. This test may be done in the hospital. 
The prognosis (chance of recovery) is affected by certain factors before and after treatment. 
The prognosis of untreated osteosarcoma depends on the following:

  • The location of the tumor
  • The size of the tumor
  • The stage of the cancer(whether it spread from where it started to other places in the body)
  • The age of the patient
  • The results of blood tests and other tests
  • The type of tumor (based on how the cancer cells look under a microscope)

After osteosarcoma is treated, prognosis also depends on the following

  • How much of the cancer was killed by chemotherapy; and/or
  • How much of the tumor was taken out by surgery

Treatment options depend on the following:

  • The location of the tumor
  • The stage of the cancer

Whether the cancer has recurred (come back) after treatment

Stages of osteosarcoma
Once osteosarcoma has been found, more tests may be done to find out if cancer cells have spread to other parts of the body. This is called staging.Most patients are grouped depending on whether cancer is found in only one part of the body (localized disease) or whether the cancer has spread from one part of the body to another (metastatic disease). Your doctor needs to know where the cancer is located and how far the disease has spread to plan treatment.

The following groups are used for osteosarcoma:

Localized osteosarcoma

The cancer cells have not spread beyond the bone or nearby tissue in which the cancer began.

Metastatic osteosarcoma

The cancer cells have 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. About one in five patients with osteosarcoma has cancer that has metastasized by the time it is diagnosed.

Recurrent Osteosarcoma

Recurrent disease means that the cancer has come back (recurred) after it has been treated