Among the other overexpressed genes in the metastatic tumors, we focused on the IFITM1 gene, which encodes a small protein localized in the plasma membrane, because it was reported that this gene is involved in cancer progression and metastasis in several cancers; however, its roles in SCLC are unclear [22,23,24,25]. This evidence concerns the gene IFITM1 and metastatic neoplasm.