Abbreviation	Meaning
AIC	Akaike’s information criterion
AJCC	American Joint Committee on Cancer
CCRT	Concurrent chemoradiotherapy
CI	Confidence interval
CT	Computed tomography
HR	Hazard ratio
iAUC	Integrated area under the receiver operating characteristic curve: An integral of the product of area under the cumulative/dynamic time-dependent receiver operating characteristic curve and the probability density function of the time-to-event outcome
ICC	Intraclass correlation coefficient
LASSO	Least absolute shrinkage and selection operator: A penalized regression method commonly used in machine learning to select a subset of variables
MRI	Magnetic resonance imaging
OS	Overall survival: The interval between the date of initial pathologic diagnosis and the date of death or the end of follow-up
PFS	Progression-free survival: The interval between the date of initial pathologic diagnosis and the date of the first sign of progression, death, or time point of censoring