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[The optimized dosage specific for different organs with regard to late effect].

¹Dept. of Radiology, Hokkaido Univ. School of Med.

Gan No Rinsho. Japan Journal of Cancer Clinics

|October 1, 1987

Summary

Optimizing radiation dosage for head and neck cancers is crucial. Fractionation of 2.5 Gy per fraction shows improved local control and fewer complications for laryngeal cancer patients.

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Area of Science:

Radiation oncology
Medical physics

Context:

Optimizing radiation therapy requires organ-specific dosage.
Current evidence suggests varying optimal doses across different organs.

Purpose:

To determine the optimized radiation dosage for laryngeal cancer.
To evaluate the efficacy of different dose-fractionation schedules.

Summary:

The study employed the Nominal Standard Dose-Total Dose Fraction (NSD-TDF) concept and linear-quadratic (LQ) model.
Dose-fractionation of 2.5 Gy per fraction yielded better local control and reduced complications compared to larger fractions.
Maxillary cancer management involves combined radiation and surgery, with chemotherapy as an option.
Decreased local control and survival were observed with higher total doses in maxillary cancer, indicating a supra-lethal dose phenomenon.
Optimized dosage for uterine cervix carcinoma is complex due to combined external and intracavitary irradiation. A regimen of 50 Gy pelvic irradiation (with central shielding for the last 10-15 Gy) followed by 30 Gy in 6 fractions via Rapid Arc Linear Accelerator (RALS) at point A was indicated.

Impact:

Findings suggest a 2.5 Gy fractionation is optimal for laryngeal cancer.
Highlights the supra-lethal dose phenomenon in maxillary cancer.
Provides a specific optimized fractionation schedule for uterine cervix cancer.

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