SULF1 and gastric cancer: The topmost molecular network in the intestinal subtype on IPA network analysis showed increased expression of SULF1 [62], HGF [63,64], SPARC [65,66,67], SERPINH1 [68], and IGFBP7 [69,70], which have been shown to contribute to the growth and survival of tumor cells, tumor invasion, metastasis, and poor survival in gastric cancer (Supplementary Figure S2).