BC	Breast cancer
CDK 4/6	Cyclin dependent kinase 4/6
CEA	Carcinoembryonic antigen
CA 15-3	Carcinoma antigen 15-3
cfDNA	Cell-free DNA
CT	Computed tomography
CTCs	Circulating tumor cells
ctDNA	Circulating tumor DNA
ΔVAF	Difference in variant allele frequencies
ECOG	Eastern Cooperative Oncology Group
ER	Estrogen receptor
EVs	Extracellular vesicles
HR	Hormone-receptor
HER2	Human epidermal growth factor receptor 2
IVA	Ingenuity variant analysis
NGS	Next-generation sequencing
MRI	Magnetic resonance imaging
MBC	Metastatic breast cancer
MRD	Minimal residual disease
PD	Progressive disease progress
PFS	Progression-free survival
PR	Progesterone receptor
SD	Stable disease
VAF	Variant allele frequency
List of genes
AKT1	AKT serine/threonine kinase 1
AKT2	AKT serine/threonine kinase 2
AR	Androgen receptor
AURKA	Aurora kinase A
BRCA1	BRCA1 DNA repair associated
BRCA2	BRCA2 DNA repair associated
EGFR	Epidermal growth factor receptor
EpCAM	Epithelial cell adhesion molecule
ERCC1	ERCC excision repair 1, endonuclease non-catalytic subunit
ERCC4	ERCC excision repair 4, endonuclease non-catalytic subunit
ERBB2	Erb-b2 receptor tyrosine kinase 2 coding for the HER2 protein
ERBB3	Erb-b2 receptor tyrosine kinase 3
ESR1	Estrogen receptor 1
FGFR1	Fibroblast growth factor receptor 1
GAPDH	Glyceraldehyde-3-phosphate dehydrogenase
KIT	KIT proto-oncogene receptor tyrosine kinase
KRT5	Keratin 5
KRAS	KRAS proto-oncogene, GTPase
MET	MET proto-oncogene, receptor tyrosine kinase
mTOR	Mechanistic target of rapamycin
MUC16	Mucin 16, cell-surface associated
NOTCH1	Notch 1
PARP1	Poly(ADP-ribose) polymerase 1
PIK3CA	Phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit alpha
PIK3R1	Phosphoinositide-3-kinase regulatory subunit 1
PTEN	Phosphatase and tensin homolog
PTGFR	Prostaglandin F receptor
PTPRC	Protein tyrosine phosphatase, receptor type, C (also known as CD45)
SOX17	SRY-box transcription factor 17
SRC	SRC proto-oncogene, non-receptor tyrosine kinase
TGFB1	Transforming growth factor beta 1