A previous study using the pancreatic neuroendocrine tumor model Rip1Tag2 identified 3 populations of pericytes in pancreatic tumors based on expression of PDGFRβ and NG2: PDGFRβ+ only, NG2+ only, and cells expressing both PDGFRβ+ and NG2+ 50. The gene discussed is CSPG4; the disease is pancreatic neuroendocrine tumor.