FP	Fluoropyrimidines
DPD	Dihydropyrimidine Dehydrogenase
DPYD-PGx	DPYD-Pharmacogenomics
PCR	Polymerase Chain Reaction
5-FU	5-Fluorouracil
ADR	Adverse Drug Reaction
HFS	Hand-Foot Syndrome
SNPs	Single-Nucleotide Polymorphisms
CPIC	The Clinical Pharmacogenetics Implementation Consortium
DPWG	Dutch Pharmacogenetics Working Group
DPYD-AS	DPYD-Activity Score
TDM	Therapeutic Drug Monitoring
MTHFR	Methylene-Tetrahydrofolate Reductase
TYMS-TSER	Thymidylate Synthase-Thymidylate Synthase Enhancer Region
GSTP1	Glutathione S-Trasferase-p1
UH2/U ratio	Dihydrouracil/Uracil Ratio
CTC-AE	Common Terminology Criteria for Adverse Events
RECIST	Response Evaluation Criteria in Solid Tumours
HPLC	High-Performance Liquid Chromatography
UHPLC-MS/MS	Ultra-High-Performance Liquid Chromatography-Tandem Mass Spectrometry
MeSH	Medical Subject Heading
PRISMA	Preferred Reporting Items for Systematic reviews and Meta-Analyses
FOLFOX	5-FU, Leucovorin and Oxaliplatin
CT scan	Computed Tomography Scan
FOLFIRI	5-FU, Leucovorin and Irinotecan
PRAC	Pharmacovigilance Risk Assessment Committee
EMA	European Medicines Agency
CHMP	Committee for Medicinal Products for Human Use
AUC	Area Under the Curve
LC-MS/MS	Liquid Chromatography-Tandem Mass Spectrometry
PBMCs	Peripheral Blood Mononuclear Cells