Evaluation of spatially fractionated radiotherapy (GRID) and definitive chemoradiotherapy with curative intent for locally advanced squamous cell carcinoma of the head and neck: initial response rates and toxicity.
OBJECTIVE
To present results and acute toxicity in 14 patients with bulky (>or=6 cm) tumors from locally advanced squamous cell carcinoma of the head and neck who received spatially fractionated radiotherapy (GRID) therapy to the bulky mass followed by concomitant chemoradiotherapy using simultaneous integrated boost intensity-modulated radiotherapy (SIB-IMRT).


METHODS
GRID therapy to the GTV was delivered by creating one treatment field with a checkerboard pattern composed of open-closed areas using a multileaf collimator. The GRID prescription was 20 Gy in one fraction. Chemotherapy started the day of GRID therapy and continued throughout the course of SIB-IMRT. The SIB-IMRT prescription was 66, 60, and 54 Gy to the planning target volume (PTV), intermediate-risk PTV, and low-risk PTV, respectively, in 30 fractions.


RESULTS
With a median follow-up of 19.5 months (range, 2-38 months), the overall control rate of the GRID gross tumor volume was 79% (11 of 14). The most common acute skin and mucosal toxicities were Grade 3 and 2, respectively.


CONCLUSIONS
For the treatment of locally advanced neck squamous cell carcinoma of the head and neck, GRID followed by chemotherapy and SIB-IMRT is well tolerated and yields encouraging clinical and pathologic responses, with similar acute toxicity profiles as in patients receiving chemoradiotherapy without GRID.
Peñagarícano
José A
JA
Department of Radiation Oncology, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA. PenagaricanoJoseA@uams.edu
Moros
Eduardo G
EG
Ratanatharathorn
Vaneerat
V
Yan
Yulong
Y
Corry
Peter
P
D000328:Adult; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D016190:Carboplatin / Q000008:administration & dosage; D002294:Carcinoma, Squamous Cell / Q000188:drug therapy* / Q000473:pathology / Q000532:radiotherapy*; D002945:Cisplatin / Q000008:administration & dosage; D003131:Combined Modality Therapy / Q000379:methods; D000077143:Docetaxel; D005472:Fluorouracil / Q000008:administration & dosage; D005500:Follow-Up Studies; D006258:Head and Neck Neoplasms / Q000188:drug therapy* / Q000473:pathology / Q000532:radiotherapy*; D006801:Humans; D008875:Middle Aged; D017239:Paclitaxel / Q000008:administration & dosage; D011879:Radiotherapy Dosage; D050397:Radiotherapy, Intensity-Modulated / Q000379:methods*; D043823:Taxoids / Q000008:administration & dosage; D047368:Tumor Burden
D043823:Taxoids; D000077143:Docetaxel; D016190:Carboplatin; D017239:Paclitaxel; D002945:Cisplatin; D005472:Fluorouracil