HRs	hormone receptors
ER	estrogen receptor
PR	progesterone receptor
HER2	human epidermal growth factor 2
RT	radiotherapy
LB	liquid biopsies
CTCs	circulating tumor cells
ctDNA	cell-free circulating tumor DNA
EpCAM	epithelial cell adhesion molecule
EVs	extracellular vesicles
cfDNA	cell-free DNA
RT-qPCR	real-time quantitative PCR
WGS	whole-genome sequencing
WES	whole-exome sequencing
MAFs	mutant allele frequencies
ddPCR	digital droplet PCR
Erα	estrogen receptor alpha
AIs	aromatase inhibitors
NGS	next-generation sequencing
SNPs	single nucleotide polymorphisms
TARDIS	targeted digital sequencing
MVBs	multivesicular bodies
IDC	invasive ductal carcinoma
DCIS	ductal carcinoma in situ
TME	tumor microenvironment
miRNAs	microRNAs
GSTP1	glutathione S-transferase P1
TK1	thymidine kinase 1
CDK9	cyclin-dependent kinase 9
Hsps	heat shock proteins
Del-1	developmental endothelial locus-1
UCH-L1	ubiquitin carboxyl-terminal hydrolase-L1
P-gp	P-glycoprotein
TrpC5	transient receptor potential channel 5
EMT	epithelial-mesenchymal transition
MBC	metastatic breast cancer