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Low dose rate teletherapy and tumour response
C S Hamilton1, S A Simpson, S Ferguson
1Department of Radiation Oncology, Newcastle Mater Misericordiae Hospital, Waratah, NSW, Australia.
Australasian Radiology
|May 1, 1993
Summary
This study investigated fractionated low dose rate (FLDR) teletherapy for head and neck cancer. Results showed a 28% complete response rate, suggesting FLDR may have a greater anti-tumour effect than predicted.
Area of Science:
- Oncology
- Radiation Oncology
- Medical Physics
Background:
- Locally advanced head and neck cancer presents treatment challenges.
- Palliative intent treatment aims to manage symptoms and improve quality of life.
- Fractionated low dose rate (FLDR) teletherapy is an experimental treatment approach.
Purpose of the Study:
- To report tumour responses in patients with locally advanced head and neck cancer treated with FLDR teletherapy.
- To evaluate the efficacy of FLDR teletherapy at various dose rates and total doses.
- To compare observed responses with predictions from the linear quadratic formula.
Main Methods:
- Twenty-five patients with locally advanced head and neck cancer were enrolled.
- Treatment involved FLDR teletherapy at dose rates of 1.8 to 3 Gy/h.
- Total doses ranged from 32-38 Gy, delivered with palliative intent.
Main Results:
- A complete response rate of 28% was observed.
- The linear quadratic formula predicted equivalent doses of 33-41 Gy for acute normal tissue effects.
- Observed response rates suggest potential underestimation of FLDR's anti-tumour effect by the linear quadratic formula.
Conclusions:
- FLDR teletherapy demonstrated a 28% complete response rate in locally advanced head and neck cancer.
- The linear quadratic formula may underestimate the anti-tumour efficacy of FLDR teletherapy.
- Further research is warranted to optimize FLDR protocols for head and neck cancer treatment.