NE	neuroendocrine
NST	non-special type
NET	neuroendocrine tumor
NEC	neuroendocrine carcinoma
WHO	World Health Organization
NEN	neuroendocrine neoplasm
HER2	human epidermal growth factor type 2
HR	hormone receptor
CDK4/6	cyclin-dependent kinase 4/6
IHC	immunohistochemistry
IBC-NST	invasive breast cancer of no special type
Br-NENs	neuroendocrine neoplasms of the breast
CGA	chromogranin A
SYN	synaptophysin
LCNEC	large cell neuroendocrine carcinoma
SCNEC	small cell neuroendocrine carcinoma
ER	estrogen receptor
PgR	progesterone receptor
T-DM1	trastuzumab-emtansine
ADC	antibody-drug conjugate
PPRT	Peptide receptor radionuclide therapy