Causes and Risk Factors of Bone Cancer
The precise causes and risk factors of bone cancer are often unknown, but researchers believe a combination of genetic mutations, bone cell abnormalities, and environmental exposures play a role. While many cases are sporadic, several risk factors have been identified.
1. Genetic mutations
- DNA mutations in cells cause them to grow uncontrollably.
- These mutations may be spontaneous or inherited.
- Certain syndromes, like Li-Fraumeni syndrome or hereditary retinoblastoma, increase bone cancer risk.
2. Radiation exposure
- Previous radiation therapy, particularly during childhood, increases the chance of developing osteosarcoma later in life.
- High-dose exposure (e.g., from radiotherapy for other cancers) is a known risk.
3. Bone disorders
- Paget’s disease of bone, common in older adults, increases the risk of chondrosarcoma.
- Some benign bone tumours or abnormal growths may rarely turn malignant over time.
4. Age and growth spurts
- Osteosarcoma and Ewing sarcoma are more common in teenagers during rapid bone growth periods.
- Chondrosarcoma, on the other hand, usually affects people over 40.
5. Gender
- Bone cancer occurs slightly more often in males than females, particularly osteosarcoma and Ewing sarcoma.
6. Family history
- Although most cases are not hereditary, a family history of bone cancer or related syndromes can increase risk.
- Genetic counselling may be recommended in certain cases.
7. Chronic inflammation or injury
- While not a direct cause, areas of chronic bone irritation or injury may, in rare instances, become cancerous.
8. Ethnicity and geography
- Studies show Ewing sarcoma is more common in Caucasian populations, while osteosarcoma has no strong ethnic predisposition.
- In South Africa, disparities in healthcare access often mean later-stage diagnosis, particularly in rural or low-income communities.
Causes and Risk Factors of Bone Cancer
Understanding the risk factors is crucial for early screening in high-risk individuals and for guiding treatment decisions.
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