Frequent mutations of the CA simple sequence repeat in intron 1 of EGFR in mismatch repair-deficient colorectal cancers

Table 2 Status of EGFR CA-SSR I in patients with MSI-H and MSS colorectal tumors n/n (%)

	CA-SSR I MSIb	CA-SSR I MSSb	CA-SSR I MSS1
			AI+	AI-
MSI-H (n = 42)	36/42 (85.7)	6/42 (14.3)	0/1 (0)	1/1 (100)
MSS (n = 44)	0/44 (0)	44/44 (100)	5/30 (16.7)	25/30 (83.3)

¹Tumors from informative patients for AI score determination, i.e. heterozygous for CA-SSR I.

^bP < 0.001, regarding the comparison of CA-SSR I MSI vs CA-SSR I MSS distribution according to the MSI status (χ² test).