What is the difference between primary bone cancer and secondary bone cancer?

Primary bone cancer originates in the bone itself, arising from bone cells or the tissues within the bone marrow. In contrast, secondary bone cancer, also known as metastatic bone cancer, develops when cancer cells from another part of the body, such as the breast, lung, or prostate, spread (metastasize) to the bones. Essentially, primary bone cancer starts in the bone, while secondary bone cancer spreads to the bone from a different primary location.

The difference between primary and secondary bone cancer lies in where the cancer originates:

• Primary bone cancer starts in the bone itself. The cancerous cells originate within the bone tissue. It's relatively rare.
• Secondary bone cancer (also called metastatic bone cancer) begins in another part of the body (like the breast, lung, prostate, or kidney) and then spreads (metastasizes) to the bones. This is much more common than primary bone cancer. The cancer cells in the bone are actually clones of the original cancer cells from the primary site.

Currently, there are no clearly defined risk factors for the development of bone cancers.

Bone cancers may affect individuals of different ages. Children, adolescents and young adults in particular are disproportionately affected by common subtypes of bone cancers such as osteosarcoma and Ewing sarcoma. Chondrosarcoma, meanwhile, tends to affect older adults.

It is relatively uncommon for individuals to inherit genetic mutations that predisposes them to developing bone cancers. However, there are some rare, hereditable genetic disorders such as Li Fraumeni Syndrome that can increase the risk of bone cancers for individuals with these disorders.