Table 3.

Change in estrogen receptor and progesterone receptor (ER/PR) and human epidermal growth factor receptor 2 (HER2) status in primary and metastatic tumors

Primary tumor	Metastatic lesions	Case number
ER -	ER +	2
ER +	ER -	5
PR -	PR +	1
PR +	PR -	7
HER2 -	HER2 +	2
HER2 +	HER2 -	2