ICD-9-CM	International Classification of Diseases: Ninth Revision, Clinical Modification
AJCC	American Joint Committee on Cancer; HR, hazard ratio
CI	confidence interval
CCI	Charlson comorbidity index
OS	overall survival
PSM	propensity score–matched
FOLFOX	oxaliplatin, fluoropyrimidine, and leucovorin
FOLFIRI	folinic acid, fluorouracil, irinotecan
aHRs	adjusted HRs
MOSAIC	multicenter international study of oxaliplatin, fluoropyrimidine, and leucovorin in the adjuvant treatment of colon cancer
NSABP	national surgical adjuvant breast and bowel project
NCCN	National Comprehensive Cancer Network
TCRD	Taiwan Cancer Registry database
AJCC	American Joint Committee on Cancer
CCI	Charlson comorbidity index; PS, propensity score
TNM	tumor, node, metastasis