“…Only 2 studies reported on progression-free survival (up to 7.9 months) (Kankaanranta et al, 2012;Suzuki et al, 2014). This end-point is important for these patients, as head and neck tumours may cause a loss of organ function and cosmesis issues that may impair the patients' quality of life (Zafereo et al, 2009). Generally these radioresistant recurrent head and neck tumours, responded well to BNCT with at least 71.2% of the patients experiencing tumour shrinkage of more than 30% or complete disappearance of tumour.…”