99mTc	Technetium-99m (radioisotope commonly used in nuclear medicine for diagnostic imaging)
AC	Anthracycline, cyclophosphamide
AI	Aromatase inhibitor
ALND	Axillary lymph node dissection
AP	Anatomic pathology
BCS	Breast-conserving surgery
CI	Confidence interval
DCIS	Ductal carcinoma in situ
DFS	Disease-free survival
ECE	Extracapsular extension
ET	Endocrine therapy
ETDs	Extranodal tumor deposits
FNR	False negative rate
HER2	Human epidermal growth factor receptor 2
HR	Hazard ratio
HT	Hormone therapy
iCDK4/6	Inhibitor of cyclin-dependent kinase 4 and cyclin-dependent kinase 6
ICH-GCP	International Conference on Harmonization of Good Clinical Practices
IQR	Interquartile range
INC	Instituto Nacional de Cancerología
LVI	Lymphovascular invasion
NACT	Neoadjuvant chemotherapy
NOS	Not Otherwise Specified
OR	Odds ratio
OS	Overall survival
pCR	Pathological complete response
Post-NACT SLNB	Sentinel lymph node biopsy after neoadjuvant chemotherapy
RCB	Residual Cancer Burden
RFS	Recurrence-free survival
RT	Radiotherapy
SD	Standard deviation
SLN	Sentinel lymph node
SLNB	Sentinel lymph node biopsy
T	Taxanes
TAD	Targeted axillary dissection
TC	Taxane and cyclophosphamide
TH	Taxanes and trastuzumab
TNBC	Triple Negative Breast Cancer
TR	Time to recurrence
UFM-INC	Functional Unit for Breast and Soft Tissue Tumors, Instituto Nacional de Cancerología
Upfront SLNB	Sentinel lymph node biopsy at the time of the initial surgery, before the administration of any systemic therapy (such as neoadjuvant chemotherapy)