The results of ToPP prognostic analysis showed that a disintegrin-like and metalloproteinase with thrombospondin type 1 motif 18 (ADAMTS18), collagen type X alpha 1 chain (COL10A1), protein phosphatase with EF-hand domain 1 (PPEF1), and stimulated by retinoic acid 6 (STRA6) were abundantly expressed in STAD; this was associated with a dismal prognosis for patients with STAD (Figures 1B, –I). The gene discussed is PPEF1; the disease is gastric adenocarcinoma.