Six-Fraction Ultra-Hypofractionated Radiotherapy for Tumours Adjacent to or Involving the Brachial Plexus: A Retrospective Cohort Study

Background/Objectives: Tumours abutting or involving the brachial plexus can cause pain and neurological deficits. We evaluated six-fraction ultra-hypofractionated radiotherapy with a simultaneous integrated boost (uhRT-SIB) in a predominantly palliative cohort.

Methods

We retrospectively analysed consecutive patients treated from April 2022 to June 2026, with a data cut-off of 7 July 2026. Image-guided VMAT delivered 33 Gy and 24 Gy to the high- and lower-dose planning target volumes, respectively. Outcomes included the best documented CTCAE-based symptom response, study-defined volumetric response (>30% GTV reduction), freedom from local progression (FFLP), overall survival (OS), and neurological findings in routine clinical records.