Adaptive dose painting by numbers for head-and-neck cancer

International Journal of Radiation Oncology, Biology, Physics
Fréderic DuprezIndira Madani

Abstract

To investigate the feasibility of adaptive intensity-modulated radiation therapy (IMRT) using dose painting by numbers (DPBN) for head-and-neck cancer. Each patient's treatment used three separate treatment plans: fractions 1-10 used a DPBN ([(18)-F]fluoro-2-deoxy-D-glucose positron emission tomography [(18)F-FDG-PET]) voxel intensity-based IMRT plan based on a pretreatment (18)F-FDG-PET/computed tomography (CT) scan; fractions 11-20 used a DPBN plan based on a (18)F-FDG-PET/CT scan acquired after the eighth fraction; and fractions 21-32 used a conventional (uniform dose) IMRT plan. In a Phase I trial, two dose prescription levels were tested: a median dose of 80.9 Gy to the high-dose clinical target volume (CTV(high_dose)) (dose level I) and a median dose of 85.9 Gy to the gross tumor volume (GTV) (dose level II). Between February 2007 and August 2009, 7 patients at dose level I and 14 patients at dose level II were enrolled. All patients finished treatment without a break, and no Grade 4 acute toxicity was observed. Treatment adaptation (i.e., plans based on the second (18)F-FDG-PET/CT scan) reduced the volumes for the GTV (41%, p = 0.01), CTV(high_dose) (18%, p = 0.01), high-dose planning target volume (14%, p = 0.02), and p...Continue Reading

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