Approximately 20% to 25% of patients with osteosarcoma present with clinically detectable metastatic disease. For patients with metastatic disease at initial presentation, roughly 20% will remain continuously free of disease, and roughly 30% will survive 5 years from diagnosis.
The lung is the most common site of initial metastatic disease. Patients with metastases limited to the lungs have a better outcome than patients with metastases to other sites or to the lungs combined with other sites.[1,3]
Cancer prevention is action taken to lower the chance of getting cancer. By preventing cancer, the number of new cases of cancer in a group or population is lowered. Hopefully, this will lower the number of deaths caused by cancer.
To prevent new cancers from starting, scientists look at risk factors and protective factors. Anything that increases your chance of developing cancer is called a cancer risk factor; anything that decreases your chance of developing cancer is called a cancer protective...
The chemotherapeutic agents used include high-dose methotrexate, doxorubicin, cisplatin, high-dose ifosfamide, etoposide, and in some reports, carboplatin or cyclophosphamide. High-dose ifosfamide (17.5 grams per course) in combination with etoposide produced a complete (10%) or partial (49%) response in patients with newly diagnosed metastatic osteosarcoma. The addition of either muramyl tripeptide or ifosfamide to a standard chemotherapy regimen that included cisplatin, high-dose methotrexate, and doxorubicin was evaluated using a factorial design in patients with metastatic osteosarcoma (n = 91). There was a nominal advantage for the addition of muramyl tripeptide (but not for ifosfamide) in terms of event-free survival (EFS) and overall survival (OS), but criteria for statistical significance were not met.
The treatment for malignant fibrous histiocytoma (MFH) of bone with metastasis at initial presentation is the same as the treatment for osteosarcoma with metastasis. Patients with unresectable or metastatic MFH have a very poor outcome.
Lung Metastases Only
Patients with metastatic lung lesions as the sole site of metastatic disease should have the lung lesions resected if at all possible. Generally, this is done following administration of preoperative chemotherapy. In approximately 10% of patients, all lung lesions disappear following preoperative chemotherapy. Complete resection of pulmonary metastatic disease can be achieved in a high percentage of patients with residual lung nodules following preoperative chemotherapy. The cure rate is essentially zero without complete resection of residual pulmonary metastatic lesions.
For patients who present with primary osteosarcoma and metastases limited to the lungs and who achieve complete surgical remission, 5-year EFS is approximately 20% to 25%. Multiple metastatic nodules confer a worse prognosis than one or two nodules, and bilateral lung involvement is worse than unilateral. Patients with peripheral lesions may have a better prognosis than those with central lesions. Patients with fewer than three nodules confined to one lung may achieve a 5-year EFS of approximately 40% to 50%.