SFTPD and gastric cancer: The bioinformatics analysis on SP-D mRNA expression in gastric cancer via Cho’s and DErrico’s datasets showed its higher expression in healthy gastric mucosa compared to its malignant counterpart, stratified into intestinal, diffuse, and mixed-type adenocarcinoma by Lauren’s classification (Figure 3A, p < 0.05; Figure S2 in Supplementary Material, p < 0.05).