Table 2.

Incidence of CD47 and PD-L1 expression on CTCs of patients with metastatic BC (n = 97) according to the BC subtype.

CTC Populations	CTC Detection According to BC Subtype (% of Patients)			p Value
	Triple-Negative	HR+/HER2−	HER2+
Total CTCs	50	20.6	13.6	0.053
CD47+	50	17.5	13.6	0.045 *
CD47high	25	11.1	0	0.049 *
PD-L1+	25	4.8	0	0.025 *
PD-L1high	16.7	4.8	0	0.097
CD47+and/orPD-L1+	50	17.5	13.6	0.045 *
CD47highand/orPD-L1high	33.3	11.1	0	0.015 *

* Statistical significance at the p < 0.05 level; Two-sided Fisher’s exact test.