How Common Is Osteosarcoma? Incidence and Survival

When you or your child is diagnosed with osteosarcoma, it is common to want to know exactly how rare the disease is to comprehend the scale of what you are dealing with. Osteosarcoma is a rare disease, accounting for approximately 2% to 5% of all childhood cancers ^[1][2].

In the United States, there are roughly 800 to 1,000 new cases of osteosarcoma diagnosed each year across all age groups ^[3]. When looking specifically at children and adolescents, the incidence rate is generally estimated at 4 to 5 cases per million individuals each year ^[3].

While hearing that a disease is rare can feel isolating, it is important to know that you are not alone. These statistics mean that while osteosarcoma is uncommon in the general public, it is treated by multidisciplinary sarcoma teams using established protocols and ongoing clinical research.

Survival Rates and Prognosis

Looking at survival statistics can be daunting. It is critical to focus on the numbers that apply to your specific situation and to remember that these are 5-year survival rates (the percentage of patients who live at least 5 years after diagnosis) based on large groups of patients from past years. They cannot predict the exact outcome for an individual.

The most important factor in determining prognosis is whether the cancer is localized or metastatic, though factors like the tumor’s size and location, whether it can be completely removed by surgery, and how well the tumor responds to chemotherapy also matter significantly.

• Localized Osteosarcoma: This means the tumor has not spread to distant parts of the body (though it may extend into nearby soft tissue). For localized disease, the 5-year survival rate is generally between 60% and 70% ^[4][5][6].
• Metastatic Osteosarcoma: If the cancer has spread—most commonly to the lungs—the 5-year survival rate is generally lower, ranging from 20% to 30% ^[7][5][4]. Prognosis in these cases depends heavily on whether all of the metastatic tumors can be safely and completely removed during surgery.

The Role of Specialized Centers

Because osteosarcoma is so rare, consultation or referral to a center experienced in treating it is generally recommended ^[8]. Treating this disease requires a multidisciplinary approach—a coordinated effort among experts from several different medical fields ^[9].

Your care team should ideally include:

• Pediatric or medical oncologists who specialize in bone sarcomas
• Orthopedic surgical oncologists
• Pathologists and radiologists with sarcoma expertise
• Thoracic surgeons (if the cancer has spread to the lungs)
• Rehabilitation specialists

Research shows that having a negative-margin surgical resection (meaning no tumor cells are found at the cut edge of the removed tissue when examined under a microscope) is strongly associated with better outcomes ^[10][11]. Surgeons aim for complete removal whenever it can be done safely. Chemotherapy is also usually given both before and after surgery. The percentage of the tumor that dies after the first round of chemotherapy (known as tumor necrosis) provides important prognostic information for the care team.

However, access to major centers can be challenging. A sarcoma-experienced multidisciplinary review or second opinion can be highly valuable, and care can often be coordinated locally between a major center and your hometown hospital. A difficult operation, a treatment delay, or a surgical margin that is not completely negative does not mean you or your team have failed; it simply means your doctors will adjust your individualized care plan based on those results.

How These Numbers Apply to You

To understand which statistics apply to your or your child’s case, you will need to know the results of staging tests (such as MRIs, CT scans, or bone scans). You can ask your doctor what staging tests were done, whether your disease is considered localized or metastatic, and what specific features of your tumor make population estimates more or less applicable to you.