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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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[Hyperfractionated radiation therapy for head and neck cancers].

Katsuyuki Karasawa1, Nahoko Hanyu, Ta-Chen Chang

  • 1Division of Radiation Oncology, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital.

Gan to Kagaku Ryoho. Cancer & Chemotherapy
|November 18, 2008
PubMed
Summary

Hyperfractionated radiotherapy (HFRT) shows potential for improving survival and local control in head and neck cancers, particularly in hypopharyngeal and oropharyngeal sites. While acute toxicity was noted, late toxicities were minimal, suggesting HFRT

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Area of Science:

  • Oncology
  • Radiation Oncology
  • Head and Neck Cancer Research

Background:

  • Altered fractionation regimens, including hyperfractionated radiotherapy (HFRT), are explored for enhanced efficacy in head and neck cancers.
  • HFRT aims to improve survival rates (SR) and local control rates (LCR) compared to conventional methods.

Purpose of the Study:

  • To evaluate the effectiveness of HFRT compared to conventionally fractionated radiotherapy (CFRT) in head and neck cancer patients.
  • To analyze differences in SR and LCR based on disease site, stage, and treatment regimen.

Main Methods:

  • Retrospective review of 117 HFRT cases and 80 CFRT cases treated between 1995 and 2004.
  • Comparison of outcomes by disease site (nasopharynx, oropharynx, hypopharynx, larynx) and cancer stage (I-IV).
  • Analysis included assessment of median radiation therapy (RT) dose and concurrent chemotherapy use.

Main Results:

  • A borderline significant difference in LCR (5 years) was observed for advanced stages (III/IV): 44.3% for HFRT vs. 24.5% for CFRT (p=0.0502).
  • A trend towards improved SR (5 years) was seen in advanced stages: 50.7% for HFRT vs. 16.7% for CFRT (p=0.1210).
  • HFRT demonstrated significantly higher LCR in hypopharynx and oropharynx cancers, and higher SR in hypopharyngeal cancers.

Conclusions:

  • HFRT may be an effective treatment option for specific head and neck cancers, particularly those of the hypopharynx and oropharynx.
  • While acute toxicity was manageable, HFRT showed promising results in local control and survival for advanced-stage disease.
  • Further research into HFRT is warranted given its potential benefits in head and neck oncology.