Bone cancer is a relatively rare form of cancer that originates in the cells of the bone. It can occur in any bone in the body, though it most commonly affects the long bones of the arms and legs. Understanding the difference between primary bone cancer — which begins in the bone itself — and secondary (metastatic) bone cancer, which spreads to the bone from another part of the body, is an important first step in understanding the condition.
What are the main types of bone cancer?
Primary bone cancers are classified by the type of cell in which they originate. The three most common types are:
- Osteosarcoma — the most prevalent type, typically affecting children and young adults. It most often develops in the long bones around the knee.
- Chondrosarcoma — arises from cartilage cells and is more common in older adults. It frequently affects the pelvis, thigh, and shoulder.
- Ewing sarcoma — occurs primarily in children and teenagers, most often in the pelvis, thigh, or shin bone.
Less common types include chordoma, fibrosarcoma, and giant cell tumour of bone. Secondary bone cancer, where cancer cells travel to the bone from elsewhere in the body (such as the breast, prostate, or lung), is considerably more common than primary bone cancer.
What are the symptoms of bone cancer?
Symptoms can vary depending on the location and size of the tumour, and they sometimes develop gradually over weeks or months. The most frequently reported symptoms include:
- Persistent or intermittent pain in the affected bone, which may worsen at night or during physical activity
- Swelling or tenderness around the affected area
- A noticeable lump or mass on or near a bone
- Unexplained fatigue or general weakness
- Unintended weight loss
- Bone fractures that occur more easily than expected (pathological fractures)
Many of these symptoms can be caused by conditions far less serious than cancer, such as injury or infection. However, symptoms that persist or worsen without a clear explanation warrant medical evaluation.
How is bone cancer diagnosed?
Diagnosis typically involves a combination of imaging studies and laboratory analysis. A doctor may begin with standard X-rays, which can reveal unusual changes in bone density or structure. Further imaging — such as an MRI scan, CT scan, or bone scan — helps provide a clearer picture of the extent and location of the abnormality.
A biopsy is usually required to confirm a diagnosis. During a biopsy, a small sample of bone or tumour tissue is removed and examined under a microscope by a pathologist. This step is essential to determine whether the growth is malignant and, if so, which specific type of bone cancer is present. Blood tests, including measurements of alkaline phosphatase levels, may provide supporting information but are not diagnostic on their own.
What treatment options are available for bone cancer?
Treatment depends on several factors, including the type and stage of the cancer, its location, and the overall health of the patient. The principal approaches are:
- Surgery — the most common treatment for primary bone cancer. Surgeons aim to remove the tumour along with a margin of healthy tissue. Where possible, limb-sparing surgery is preferred over amputation, though this depends on the extent of the disease.
- Chemotherapy — uses drugs to kill cancer cells or stop them from dividing. It is often used before surgery to shrink a tumour, or after surgery to reduce the risk of recurrence. Ewing sarcoma and osteosarcoma are typically treated with chemotherapy as part of a combined approach.
- Radiation therapy — uses high-energy beams to target and destroy cancer cells. It is particularly useful when surgery is not possible, and is the primary treatment for Ewing sarcoma in certain locations.
- Targeted therapy and immunotherapy — newer approaches that may be offered for specific cancer types or in cases where standard treatments have not been effective.
Treatment is usually coordinated by a multidisciplinary team that may include an orthopaedic oncologist, medical oncologist, radiation oncologist, physiotherapist, and specialist nurse.
What are the risk factors for developing bone cancer?
For most people diagnosed with bone cancer, there is no identifiable cause. However, certain factors are associated with a higher risk:
- Previous radiation therapy — particularly high doses received during childhood
- Inherited genetic conditions, such as hereditary retinoblastoma or Li-Fraumeni syndrome
- Paget's disease of bone — a condition that disrupts normal bone remodelling and is more common in older adults
- Previous chemotherapy with certain alkylating agents
Bone cancer is not caused by injury, though pain from an injury may sometimes draw attention to an underlying problem that is then investigated.
What is the outlook for people with bone cancer?
Prognosis varies considerably depending on the type of bone cancer, the stage at diagnosis, and how well the cancer responds to treatment. When primary bone cancer is detected before it has spread beyond the original site, outcomes are generally more favourable. Advances in surgical techniques and combination therapies over recent decades have improved survival rates for several types, including osteosarcoma and Ewing sarcoma, particularly in younger patients.
Long-term follow-up care is an important part of management after initial treatment, both to monitor for recurrence and to address any lasting effects of surgery, chemotherapy, or radiation.
Where can I find reliable information and support for bone cancer?
Patients, families, and caregivers seeking in-depth guidance should consult a qualified medical specialist. For evidence-based information, the World Health Organization's cancer resources provide a useful starting point. Support groups and patient advocacy organisations can also play an important role in the emotional and practical aspects of living with or caring for someone with bone cancer.
