Abstract |
This study is to identify significant dosimetric parameters for ear disorders in nasopharyngeal carcinoma (NPC) patients treated with intensity modulated therapy only. Ninety-seven patients with NPC were retrospectively reviewed. Organs at risk (OARs) in the auditory apparatus were contoured. Dose-volume histogram parameters were generated for the Eustachian tube (ET), tympanic cavity (TC), mastoid air cells, vestibular apparatus, cochlea and internal auditory canal (IAC). Ear disorders were rated 0 (none), 1 (mild) or 2 (severe) by a clinician blinded to radiation doses; Grade 2 ear disorders was the study end-point. Multivariate analysis revealed ET.D30 (dose to 30% of ET volume) >52.75 Gy and M.D0.5CC (dose to 0.5 ml of mastoid volume) >41.04 Gy (OR = 3.77, P = 0.012 and OR = 1.27, P = 0.033, respectively) were associated with Grade 2 ear disorders. Our results demonstrated that post-irradiation ear disorders remain a common late toxicity in NPC after IMRT. ET.D30 and M.D0.5CC should be considered during IMRT treatment plan optimization, review and approval.
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Authors | Ji-Jin Yao, Guan-Qun Zhou, Li Lin, Wang-Jian Zhang, Ying-Lin Peng, Lei Chen, Ling-Long Tang, Yan-Ping Mao, Jun Ma, Ying Sun |
Journal | Scientific reports
(Sci Rep)
Vol. 5
Pg. 13525
(Sep 01 2015)
ISSN: 2045-2322 [Electronic] England |
PMID | 26323586
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Topics |
- Area Under Curve
- Carcinoma
- Dose-Response Relationship, Radiation
- Ear Diseases
(epidemiology, etiology, pathology)
- Female
- Humans
- Incidence
- Magnetic Resonance Imaging
- Male
- Middle Aged
- Multivariate Analysis
- Nasopharyngeal Carcinoma
- Nasopharyngeal Neoplasms
(radiotherapy)
- Odds Ratio
- ROC Curve
- Radiotherapy, Intensity-Modulated
(adverse effects)
- Risk Factors
- Severity of Illness Index
- Tomography, X-Ray Computed
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