Expression of CD13 in NSCLC tissues.

<p>Examples for negative immunostaining are shown for squamous cell carcinoma (<b>Fig. 1A)</b> and for adenocarcinoma (<b>Fig. 1B</b>). Positive staining results are given for squamous cell carcinomas (stromal expression of CD13) (<b>Fig. 1C and Fig. 1D</b>) and for adenocarcinomas (tumor cell expression of CD13) (<b>Fig. 1E and Fig. 1F</b>). Co-staining of CD31 (green) and of CD13 (red) demonstrates CD13 expression in endothelial cells and perivascular stroma cells in a case of adenocarcinoma (<b>Fig. 1G)</b> and squamous cell carcinoma (<b>Fig. 1H</b>).