Comparison of secretory leukocyte peptidase inhibitor (SLPI) expression in normal tissue, lung adenocarcinoma, and squamous cell carcinoma. The data were extracted from the NCBI GEO DataSets GSE1643 (normal lung, 40 samples,(
5
) and GSE3141 lung adenocarcinoma, 58 samples; squamous cell carcinoma, 53 samples).(
34
) The probe ID in the Affymetrix platforms were 2030211_at (SLPI) and AFFX‐HSAC07/X00351–5_at (β‐actin). The relative expression ratios of SLPI to β‐actin were evaluated.