Elizabeth Brown1, Rebecca Owen2, Fiona Harden3, Kerrie Mengersen3, Kimberley Oestreich4, Whitney Houghton2, Michael Poulsen2, Selina Harris5, Charles Lin5, Sandro Porceddu6. 1. Radiation Oncology Department, Princess Alexandra Hospital, Brisbane, Australia; Queensland University of Technology, Institute of Health and Biomedical Innovation, Brisbane, Australia. Electronic address: Elizabeth.Brown3@health.qld.gov.au. 2. Radiation Oncology Department, Radiation Oncology Mater Centre, Brisbane, Australia. 3. Queensland University of Technology, Institute of Health and Biomedical Innovation, Brisbane, Australia. 4. Radiation Oncology Department, Princess Alexandra Hospital, Brisbane, Australia. 5. Radiation Oncology Department, Royal Brisbane and Women's Hospital, Australia. 6. Radiation Oncology Department, Princess Alexandra Hospital, Brisbane, Australia; School of Medicine, University of Queensland, Brisbane, Australia.
Abstract
BACKGROUND AND PURPOSE: Adaptive radiotherapy (ART) can account for the dosimetric impact of anatomical change in head and neck cancer patients; however it can be resource intensive. Consequently, it is imperative that patients likely to require ART are identified. The purpose of this study was to find predictive factors that identify oropharyngeal squamous cell carcinoma (OPC) and nasopharyngeal carcinoma (NPC) patients more likely to need ART. MATERIALS AND METHODS: One hundred and ten patients with OPC or NPC were analysed. Patient demographics and tumour characteristics were compared between patients who were replanned and those that were not. Factors found to be significant were included in logistic regression models. Risk profiles were developed from these models. A dosimetric analysis was performed. RESULTS: Nodal disease stage, pre-treatment largest involved node size, diagnosis and initial weight (categorised in 2 groups) were identified as significant for inclusion in the model. Two models were found to be significant (p=0.001), correctly classifying 98.2% and 96.1% of patients respectively. Three ART risk profiles were developed. CONCLUSION: Predictive factors identifying OPC or NPC patients more likely to require ART were reported. A risk profile approach could facilitate the effective implementation of ART into radiotherapy departments through forward planning and appropriate resource allocation.
BACKGROUND AND PURPOSE: Adaptive radiotherapy (ART) can account for the dosimetric impact of anatomical change in head and neck cancerpatients; however it can be resource intensive. Consequently, it is imperative that patients likely to require ART are identified. The purpose of this study was to find predictive factors that identify oropharyngeal squamous cell carcinoma (OPC) and nasopharyngeal carcinoma (NPC) patients more likely to need ART. MATERIALS AND METHODS: One hundred and ten patients with OPC or NPC were analysed. Patient demographics and tumour characteristics were compared between patients who were replanned and those that were not. Factors found to be significant were included in logistic regression models. Risk profiles were developed from these models. A dosimetric analysis was performed. RESULTS: Nodal disease stage, pre-treatment largest involved node size, diagnosis and initial weight (categorised in 2 groups) were identified as significant for inclusion in the model. Two models were found to be significant (p=0.001), correctly classifying 98.2% and 96.1% of patients respectively. Three ART risk profiles were developed. CONCLUSION: Predictive factors identifying OPC or NPCpatients more likely to require ART were reported. A risk profile approach could facilitate the effective implementation of ART into radiotherapy departments through forward planning and appropriate resource allocation.
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