Metastatic cutaneous squamous cell carcinoma to parotid nodes: the role of bolus with adjuvant radiotherapy

Journal of Medical Imaging and Radiation Oncology
Ariyanto PramanaPeter H Graham

Abstract

Information regarding the addition of tissue equivalent bolus to adjuvant radiotherapy (RT) for intra-parotid metastatic head and neck cutaneous squamous cell carcinoma is lacking. This study aimed to evaluate the effect of bolus versus no bolus on the patterns of regional and distant recurrence, regional control (RC), cancer-specific survival (CSS), overall survival, RT toxicity and RT interruption. A retrospective study was performed on consecutive patients diagnosed between 1994 and 2008 with metastatic head and neck cutaneous squamous cell carcinoma who were treated with parotidectomy ± selective neck dissection and adjuvant RT ± parotid bolus. Seventy-five patients were identified: 64 males and 11 females, with median age of 79 years (range 40-96) of which 39 had bolus during RT. Median follow up was 48 months (range 4-177). There were 23 regional recurrences - 14 dermal, six dermal + nodal and three isolated nodal - and only two systemic recurrences. Nine patients had RT interruption >6 days due to acute skin toxicity. Bolus was associated with increased grade ≥3 radiation dermatitis (P = 0.02). RT interruption >6 days was significantly associated with inferior RC and hazard ratio, 2.83 (95% confidence interval: 1.04-7.71...Continue Reading

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