GH/GHR could mediate the TME and signal transduction including JAK/STAT, MAPK/phosphatidyl inositol 3 kinase (PI3K)/Akt, matrix metallopeptidase 2, and VEGF/VEHGR in gastric cancer, breast cancer, and melanoma (16, 20–22). The gene discussed is MMP2; the disease is breast cancer.