AT	Adjuvant therapy
CA 19-9	Carbohydrate antigen 19-9
CCC	Cholangiocarcinoma
CCRT	Concurrent chemoradiotherapy
CEA	Carcinoembryonic antigen
CI	Confidence interval
CT	Computed tomography
HR	Hazard ratio
LN	Lymph node
LRC	Locoregional control
LVI	Lymphovascular invasion
MD	Moderately differentiated
MRI	Magnetic resonance imaging
OR	Odds ratio
OS	Overall survival
PD	Pancreaticoduodenectomy
PFS	Progression-free survival
PNI	Perineural invasion
RM	Resection margin
RT	Radiotherapy
SD	Standard deviation
WD	Well differentiated