Table 1.

Patients characteristics.

Patient	Tumor hystotype and characteristic	ALDH expression	SOX-2 expression
Pt#1	Pneumocytoma	3	0
Pt#2	Pneumocytoma	4	1
Pt#3	Pneumocytoma	4	3
Pt#4	Pneumocytoma	4	0
Pt#5	Pneumocytoma with lymphonodes local recurrence	3	0

This table represents the five patients case of pneumocytoma analyzed for the immunohystochemical expression of ALDH and SOX-2. A score value for ALDH and SOX-2 was assigned using the following score classes: 0 (<5% positive), 1 (5–25% positive), 2 (>25–50% positive), 3 (>50–75% positive), and 4 (>75% positive).