Eliminating the high-risk CTV1 margin in DAHANCA oropharyngeal radiotherapy: Dosimetric impact on dysphagia and organ-at-risk doses.

Using the NTCP model, the risk of late grade ≥ 2 dysphagia was 25.8% [IQR 19–38%] in the clinical plans and 19.6% [16–26%] in the margin-less plans, which translates into a median ΔNTCP of 6.0% [3.4–8.5%], highly significant ( p < 0.001), all with baseline at 0.

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