Table 2.

Correlation analysis among the positive rates of CagA, P53, PD-L1 protein expression in gastric cancer tissues and the level of exosomal PD-L1 protein in preoperative peripheral blood

Clusters	CagA				P53				PD-L1				Exo-PD-L1
	–	+	r	P	–	+	r	P	–	+	r	P	Mean ± SD	ρ	P
CagA							−0.296	0.005			0.332	0.002		0.385	<0.001
–					8	17			18	7			0.71 ± 0.37
+					40	22			22	40			1.14 ± 0.51
P53			−0.296	0.005							−0.374	0.001		−0.496	<0.001
–	8	40							14	34			1.24 ± 0.39
+	17	22							26	13			0.75 ± 0.52
PD-L1			0.332	0.002			−0.374	0.001						0.828	<0.001
–	18	22			14	26							0.59 ± 0.29
+	7	40			34	13							1.38 ± 0.34