Table 1. MSI frequencies for each microsatellite marker.

	MSI+ samples/informative samples			MSI+ samples/informative samples
Marker	Epithelium	Stroma	P-value	Mixed tissue
D17S796	4/36 (11%)	8/33 (24%)	0.1506	1/38 (3%)
TP 53	6/35 (17%)	6/35 (17%)	0.9999	5/37 (14%)
D17S786	6/37 (16%)	1/36 (3%)	0.0512	3/40 (8%)
D17S579	4/36 (11%)	3/37 (8%)	0.6631	4/39 (10%)
Total	13/38 (34%)	16/39 (41%)	0.5372	9/40 (23%)

Significance was determined by the χ² test (epithelium vs stroma). Total refers to informative cases that showed MSI+ for at least one marker.