Figure 2.

Immunohistochemical analysis of SOX-2 positive cells in five cases of pneumocytoma of the lung. Tissue sections were stained with anti-SOX-2 antibody to detect the positivity in these five different cases of pneumocytoma of the lung. (A–O) Case 1, (B–P) Case 2, (C–Q) Case 3, (D–R) Case 4, (E–S) Case 5. Semi-quantitative method was used to assess the SOX-2 positivity of the tumor cells: 0 (<5% positive), 1 (5–25% positive), 2 (>25–50% positive), 3 (>50–75% positive), and 4 (>75% positive). Representative images of the five cases are shown at 10, 20, and 40x magnification. Isotype control for SOX-2 antibody was shown (F, N, T). Scale bar = 100 μm.