ESTRO 2024 - Abstract Book

S1243

Clinical - Head & neck

ESTRO 2024

restaged using the modified Pittsburg and the new stage grouping this changed to 14 (35.9%) with Stage I /II , 24(61.5%) with stage III/IV and 15(38.5%) Group A, 16 (41.0) B, 5 (12.8) C and 2 (5.1%) in group D respectively. Staging information was missing for 1 patient. Ten patients underwent primary surgery and out of this 6 had margin negative resection .5 had adjuvant radiotherapy (RT) and radical radiotherapy was received by 24.Majority of patients treated with radical RT had early stage disease. A total of 12 patients had recurrence/progressive disease out of which all 12 had local disease recurrence and 1 had progression in nodes. The Median follow up of the group was 85 months (1-185 months) with an OS of 70.7% (SE=7.9) and DFS of 47.4% (SE=8.2) at 5 years. Even though Node positivity, presence of facial nerve palsy, intracranial extension, metastatic disease and the new stage grouping were the significant factors influencing outcomes in the Univariate Cox Regression analysis, only facial nerve palsy and the new staging grouping were found to be predictors of OS in the multivariate analysis.

Conclusion:

SCC of EAC are rare head and neck cancers which may be managed with surgery/radiotherapy or a combination of both. Considering the limited literature available regarding these tumours, there is no consensus on the most accurate staging system which may be used and alternate systems other than TNM may be better predictors of outcomes. Early Stage disease can have good outcomes with either radiotherapy or surgery.

Keywords: External Auditory Canal, Squamous Cell Carcinoma

References:

[1] Moody SA, Hirsch BE, Myers EN. Squamous cell carcinoma of the external auditory canal: an evaluation of a staging system. Am J Otol. 2000;21(4):582-588.

[2] George M, Borsotti F, Gereige R, et al. A systematic review of the primary squamous cell carcinoma of the external auditory canal: survival outcome based on T-staging and proposal of a new classification. J Laryngol Otol. 2021;135(2):96-103. doi:10.1017/S0022215121000323

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Efficiency of accelerated 6-week Quad Shot head & neck palliative radiotherapy in community hospital

Chulmin Bang 1 , Louise Lambert 2 , Levon Igidbashian 2 , Sébastien Clavel 2 , Ba Truc Trinh 3 , Monika Knapik 3 , Varant Labajian 3 , Cao Luan Rémy Nguyen 3 , Gary Mok 2 1 Centre Hospitalier Universitaire de Montréal (CHUM), Radiation Oncology, Montreal, Canada. 2 Cité de la Santé des Services Sociaux de Laval, Radiation Oncology, Laval, Canada. 3 Cité de la Santé des Services Sociaux de Laval, Otolaryngology, Laval, Canada