“…Advanced tumour stage [11,13,14,19,20,[22][23][24], close/positive surgical margins (after reresection) [11, 13-15, 19, 22-24], cervical lymph node involvement [13][14][15]19], extracapsular spread [13][14][15]20], bone/vascular/perineural invasion and non-cohesive growth [19,20,22]. The indication for postoperative radiotherapy was not specified for 104/259 (40%) patients [9,10,17,18,25].…”