* Numbers are presented as means, (corresponding percentage)
** Abbreviations – EBV – Epstein-Barr Virus; WHO - World Health
Organization; IMRT - intensity-modulated radiotherapy; EBR – External
Beam radiation; GTV - gross target volume; CTV - clinical target volume;
PTV - patient target volume
*** IMRT data is compared to EBR in the analysis presented in the table.