Impact of Radiotherapy Dose on Ewing's Sarcoma Control
Author Information
Author(s): NEIL G. BURNET, JUDITH M. BLISS, CLIVE L. HARMER
Primary Institution: Royal Marsden Hospital
Hypothesis
What is the effect of radiotherapy dose on local control of Ewing's sarcoma of bone?
Conclusion
Higher doses of radiotherapy improve local control, but doses below 40 Gy are ineffective.
Supporting Evidence
- The 5-year survival rate for all patients was 28%.
- The local control rate at 5 years was 56% for all patients.
- Chemotherapy significantly improved local control.
- Omission of radiotherapy or a dose below 40 Gy was ineffective.
- Survival rates fell to 22% at 8 years and 16% at 10 years.
Takeaway
This study looked at how much radiation helps control a type of bone cancer called Ewing's sarcoma. It found that giving more radiation helps keep the cancer from coming back.
Methodology
The study reviewed the effects of radiation dose on local control in 96 patients treated between 1967 and 1986.
Potential Biases
Potential bias due to retrospective data collection and confounding factors affecting treatment choices.
Limitations
The study is retrospective and lacks detailed data on tumor size and treatment specifics.
Participant Demographics
Patients aged 1 to 59 years, with a median age of 16; 53 males and 43 females.
Statistical Information
P-Value
p<0.0005
Confidence Interval
95% CI 60-80%
Statistical Significance
p<0.05
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