ArticleCancer research and treatment2026
Reduced Dose and Selective Neck Irradiation Policy in Treating Oropharynx Cancer: Excellent Oncological Outcomes with Very Low Risk of Locoregional Failure.
Article in Cancer research and treatment, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeThis study aimed to evaluate the risk of locoregional failure after reduced dose selective neck irradiation (RD-SNI) in patients with oropharyngeal cancer (OPC). MATERIALS AND
methodsBetween 2008 and 2022, 342 OPC patients underwent definitive radiation therapy (with or without concurrent systemic therapy). The doses of 67.2-68.4 Gy to gross tumor volume (GTV), 56-60 Gy to high-risk clinical target volumes (CTV-HR), and 32-36 Gy to low-risk clinical target volumes (CTV-LR) were irradiated. The same target delineation and dosing policy were applied to all patients regardless of human papillomavirus (HPV) status. Oncological outcomes including failure patterns were also investigated.
resultsWith a median follow-up of 60.3 months (range, 1.4 to 196.6 months), the 3- and 5-year locoregional control, distant metastasis-free survival, disease-free survival, and overall survival rates were 91.6%/90.7%, 83.7%/80.7%, 78.7%/74.8%, and 91.0%/85.8%, respectively. The HPV-positive patients exhibited significantly better outcomes. Treatment failure occurred in 61 patients (17.8%); 37 (10.8%) had distant metastasis, 22 (6.4%) had local failure, and eight (2.3%) had regional failure. GTV failure was significantly more common in HPV-negative patients (p=0.003). Among the 27 patients with locoregional failure, either GTV and/or CTV-HR failure occurred in 22 (81.5%), with CTV-LR failure in one (3.7%), and out-target regional (OTR) failure in five (18.5%). Only five failures (1.5%) could be attributed to the current RD-SNI policy: one CTV-LR failure (0.3%) reflecting the RD policy and four OTR failures (1.2%) reflecting the SNI policy.
conclusionExcellent oncological outcomes were achieved with the current RD-SNI policy.
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