Table 2. Association between site of PIK3CA mutation and PD-L1 expression.

PIK3CA mutation	No.	PD-L1
		Positive, n (%)	P
Exon			<0.001
9	27	11 (40.7)
20	12	3 (25.0)
Other	11	3 (27.3)
Wild type	176	8 (4.5)
Domain			<0.001
Helical D	20	9 (45.0)
Kinase D	9	1 (11.1)
Other	21	7 (33.3)
Wild type	176	8 (4.5)

PD-L1, programmed death ligand-1.