2D/3D	two-dimensional/three-dimensional
E2	17β-estradiol
ECM	extracellular matrix
EGFR	epidermal growth factor receptor
EMT	epithelial-to-mesenchymal transition
ERα/ERβ	estrogen receptor alpha/estrogen receptor beta
GFs	growth factors
HER2	human epidermal growth factor receptor 2
IGF-IR	insulin-like growth factor receptor
JAMs	junctional adhesion molecules
miRNAs	microRNAs
MMPs	matrix metalloproteinases
nTPM	number of transcripts per million
OS	overall survival
PGs	proteoglycans
PR	progesterone receptor
RTKs	receptor tyrosine kinases
SDCs	syndecans
SEM	scanning electron microscopy
TME	tumor microenvironment
TNBC	triple-negative breast cancer