Table 2.

Summary of histologic features and MIB-1 LI of myoepithelial tumors

Pt. no.	Cell type	Architecture	Matrix	Tumor borders	Cytologic atypia	Necrosis	Mitosis/10 HPF	LVI	PNI	Assoc. BT	MIB-1 LI (%)
Cases of myoepithelioma
1	Mix	Sheet like	Hyalinized	Circumscribed	Mild	No	2	No	No	No	2
2	Mix	Sheet like	Myxoid	Circumscribed	Mild	No	1	No	No	No	3
3	Ep	Sheet like	Hyalinized	Circumscribed	Mild	No	1	No	No	No	1
4	Ep	Trabecular	Hyalinized	Circumscribed	Mild	No	1	No	No	No	2
5	Ep	Sheet like	Hyalinized	Circumscribed	Mild	No	3	No	No	No	3
6	Ep	Sheet like	Myxoid	Circumscribed	Mild	No	3	No	No	No	1
Cases of myoepithelial carcinoma
7	Mix	Multinodular	Hyalinized	Focal invasive	Moderate	No	3	No	No	No	3
8	Ep	Multinodular	Hyalinized	Focal invasive	Moderate	No	7	No	No	No	10
9	Mix	Sheet like	Myxoid	Invasive pattern	Marked	Yes	8	No	No	PA	15
10	C	Multinodular	Myxoid	Invasive pattern	Moderate to marked	Yes	10	No	No	PA	30
11	C	Multinodular	Hyalinized	Invasive pattern	Moderate	Yes	9	Yes	Yes	PA	30
12	Ep	Sheet like	Hyalinized	Invasive pattern	Moderate	Yes	8	No	No	No	30
13	Mix	Sheet like	Myxoid	Invasive pattern	Marked	Yes	10	Yes	Yes	ME	60
14	Ep	Sheet like	Hyalinized	Invasive pattern	Marked	Yes	3	No	No	No	15
15	Ep	Multinodular	Hyalinized	Invasive pattern	Marked	Yes	20	No	No	No	20

Assoc. BT associated benign tumor, C clear cell, Ep epithelioid, HPF high power field, LVI lymphovascular invasion, LI labelling index, Me myoepithelioma, Mix mixed, PA pleomorphic adenoma, PNI perineural invasion