Table 2. The compare of pathologic features between Non-progressors and Progressors.

Mean	Non-progressors (n = 40)	Progressors (n = 3)	P⊠
Age/years	43.4	45	0.853
Ratio of male/female	1.4(23/17)	2(2/1)	1.0
Max diameter/cm	3.3	10	<0.001
Percentage of epithelioid cells	40.9	83.3	0.001
Percentage of atypia cells	24.8	76.7	<0.001

^⊠Chi-Square test was used for Ratio of male/female; t test were used for the others.