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Patterns-of-failure guided biological target volume definition for head and neck cancer patients: FDG-PET and dosimetric analysis of dose escalation candidate subregions. Radiother Oncol 2017 08;124(2):248-255

Date

08/05/2017

Pubmed ID

28774596

Pubmed Central ID

PMC5600500

DOI

10.1016/j.radonc.2017.07.017

Scopus ID

2-s2.0-85026498392   19 Citations

Abstract

BACKGROUND: To identify the radio-resistant subvolumes in pretreatment FDG-PET by mapping the spatial location of the origin of tumor recurrence after IMRT for head-and-neck squamous cell cancer to the pretreatment FDG-PET/CT.

METHODS: Patients with local/regional recurrence after IMRT with available FDG-PET/CT and post-failure CT were included. For each patient, both pre-therapy PET/CT and recurrence CT were co-registered with the planning CT (pCT). A 4-mm radius was added to the centroid of mapped recurrence growth target volumes (rGTV's) to create recurrence nidus-volumes (NVs). The overlap between boost-tumor-volumes (BTV) representing different SUV thresholds/margins combinations and NVs was measured.

RESULTS: Forty-seven patients were eligible. Forty-two (89.4%) had type A central high dose failure. Twenty-six (48%) of type A rGTVs were at the primary site and 28 (52%) were at the nodal site. The mean dose of type A rGTVs was 71Gy. BTV consisting of 50% of the maximum SUV plus 10mm margin was the best subvolume for dose boosting due to high coverage of primary site NVs (92.3%), low average relative volume to CTV1 (41%), and least average percent voxels outside CTV1 (19%).

CONCLUSIONS: The majority of loco-regional recurrences originate in the regions of central-high-dose. When correlated with pretreatment FDG-PET, the majority of recurrences originated in an area that would be covered by additional 10mm margin on the volume of 50% of the maximum FDG uptake.

Author List

Mohamed ASR, Cardenas CE, Garden AS, Awan MJ, Rock CD, Westergaard SA, Brandon Gunn G, Belal AM, El-Gowily AG, Lai SY, Rosenthal DI, Fuller CD, Aristophanous M

Author

Musaddiq J. Awan MD Assistant Professor in the Radiation Oncology department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Adult
Aged
Aged, 80 and over
Dose-Response Relationship, Radiation
Female
Fluorodeoxyglucose F18
Head and Neck Neoplasms
Humans
Male
Middle Aged
Neoplasm Recurrence, Local
Positron Emission Tomography Computed Tomography
Positron-Emission Tomography
Radiopharmaceuticals
Radiotherapy Planning, Computer-Assisted
Tomography, X-Ray Computed
Treatment Failure
Tumor Burden