5-FU	5-Fluorouracil
ABC	ATP-Binding Cassette
BER	Base-Excision Repair
CDA	Cytidine Deaminase
CDP	Cytidine Diphosphate
CDTD	Deoxycytidine Monophosphate Deaminase
CSCs	Cancer Stem-Like Cells
dCDA	Deoxycytidine Deaminase
dCDP	Deoxycytidine Diphosphate
dCK	Deoxycytidine Kinase
dCTP	Deoxycytidine Triphosphate
DDDs	DNA-Damaging Drugs
DDRs	DNA-Damage Responses
dFdC	Gemcitabine
dFdCDP	Gemcitabine Diphosphate
dFdCMP	Gemcitabine Monophosphate
dFdCTP	Gemcitabine Triphosphate
dFdU	2′,2′-Difluorodeoxyuridine
dFdUMP	2′,2′-Difluorodeoxyuridine Monophosphate
dFdUTP	2′,2′-Difluorodeoxyuridine Triphosphate
DFDCDP	Difluorodeoxycytidine Diphosphate
DFDCMP	Difluorodeoxycytidine Monophosphate
DFDCTP	Difluorodeoxycytidine Triphosphate
DNA	Deoxyribonucleic Acid
DPD	Dihydropyrimidine Dehydrogenase
dTMP	Deoxythymidine Monophosphate
EMT	Epithelial-to-Mesenchymal Transition
ER	Endoplasmic Reticulum
FDUMP	Fluorodeoxyuridine Monophosphate
Gem	Gemcitabine
GOF	Gain Of Functions
GSIs	Gamma-Secretase Inhibitors
GSH	Glutathione
HR	Homologous Recombination
IC50	Half-Maximal Inhibitory Concentration
IDH1	Isocitrate Dehydrogenase 1
JAK/STAT3	Janus kinase/Signal Transducers and Activators of Transcription
MHC	Major Histocompatibility Complex Class
MVP	Major Vault Protein
NDPK	Nucleoside Diphosphate Kinase
NER	Nucleotide Excision Repair
NHEJ	Non-Homologous End-Joining
NMPK	Nucleoside Monophosphate Kinase
OATP	Organic Anionic Transporter
OCT	Organic Cation Transport
ROS	Reactive Oxygen Species
RNA	Ribonucleic Acid
RR	Ribonucleotide Reductase
Ser	Serine
TAMs	Tumor-Associated Macrophages
TME	Tumor Microenvironment
TK1	Thymidine Kinase 1
TS	Thymidine Synthase
VDR	Vitamin D Receptor
VRAC	Volume-Regulated Anion Channel