cCR	Clinical complete response
CT	Computed tomography
CTV	Clinical target volume
DVH	Dose volume histogram
GTV	Gross tumor volume
HU	Hounsfield unit
ID	Integral dose
LARC	Locally advanced rectal cancer
LCRT	Long-course radiotherapy
LET	Linear energy transfer
MFO	Multifield optimization
OAR	Organ at risk
pCR	Pathological complete response
PT	Proton therapy
PTV	Planning target volume
RBE	Relative biological effectiveness
RT	Radiotherapy
SCRT	Short course radiotherapy
SFUD	Single field uniform dose
TME	Total mesorectal excision
xRT	Photon radiotherapy