Table 4. Different levels of CTCs HR expression status based on different hormone receptor statuses of the primary tumors.

HR status of CTCs	HR status of the primary tumor		Mann-Whiteney u	P value
	Positive	Negative
high-level expression	22 (5.8%)	11 (3.5%)	Z= −3.524	<0.001
moderate-level expression	156 (41.2%)	101 (32.5%)
low-level expression	111 (29.3%)	90 (28.9%)
non-expression	90 (23.7%)	109 (35.0%)