In this regard, we took advantage of GEO (http://www.ncbi.nlm.nih.gov/geo/) and chose three independent GSE studies that reported metastasis of colon (GSE2509), melanoma (GSE8401), and pancreatic cancer cells after TGFβ exposure (GSE23952) to find commonly altered gene(s) after metastasis (Figure S3A). The gene discussed is TGFB1; the disease is melanoma.