Table 1 Epithelial and stromal BAF250a (ARID1A) expression

Tissue type	BAF250a epithelial					Total
	0	+	++	+++	++++
Endometrium (P=0.001)^a
BAF250a stromal
0	0	1	0	0	1	2
+	0	0	0	1	0	1
++	0	0	0	1	8	9
+++	0	0	0	0	5	5
++++	0	0	0	0	13	13
Total	0	1	0	2	27	30
Endometriosis (ovarian) (P=0.002)^a
BAF250a stromal
0	3	0	0	0	0	3
+	0	0	0	1	0	1
++	0	0	1	0	2	3
+++	0	0	1	2	5	8
++++	0	0	0	0	5	5
Total	3	0	2	3	12	20
Endometriosis (peritoneal) (P=0.003)^a
BAF250a stromal
0	0	0	0	1	1	2
+	0	0	1	0	0	1
++	0	0	0	0	4	4
+++	0	0	0	0	3	3
++++	0	0	0	0	6	6
Total	0	0	1	1	14	16
Endometriosis (deep) (P=0.001)^a
BAF250a stromal
0	1	0	0	0	0	1
+	0	0	0	0	0	0
++	0	0	0	0	7	7
+++	0	0	0	0	9	9
++++	0	0	1	0	4	5
Total	1	0	1	0	20	22
Total (P=0.001)^a
BAF250a stromal
0	4	1	0	1	2	8
+	0	0	1	2	0	3
++	0	0	1	1	21	23
+++	0	0	1	2	22	25
++++	0	0	1	0	28	29
Total	4	1	4	6	73	88

0, 0% of the cells stained positive; +, up to 10% of the cells; ++, 11–50% of the cells; +++, 51–80%; ++++, > 80% of the cells.
Representation of only the cases that were simultaneously evaluable for epithelial and stromal BAF250a (ARID1A) expression. Cases that could only be evaluated for either epithelial or stromal expression due to lack of adequate tissue in the sample are not included in this table.
^aχ² test.

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