Figure 1
Simplified overview of main genes and pathways involved in PHEO/PGL. Blue boxes, tumor suppressor genes involved in hereditary
PHEO/PGL; red boxes, proto-oncogenes involved in hereditary PHEO/PGL; black arrows, simplified Krebs cycle; orange arrows,
inhibition effect; dotted arrows, not well-established mechanism; green arrows, stimulating effect. AKT, RAC-alpha serine/threonine-protein
kinase; ERK/MAPK1, mitogen-activated protein kinase 1; FH, fumarate hydratase; HIF1α, hypoxia-inducible factor 1 alpha subunit;
HIF1β, hypoxia-inducible factor 1 beta subunit; HIF2α/EPAS1, endothelial PAS domain protein 1; IDH, isocitrate dehydrogenase;
MAPK pathway, mitogen-activated protein kinase pathway; MAX, MYC-associated factor X; MDH2, malate dehydrogenase 2; mTOR,
mammalian target of rapamycin; MYC, MYC proto-oncogene; NF1, neurofibromin 1; PHD/EGLN 1, 2, 3, prolyl hydroxylase domain
protein/egl-9 family hypoxia-inducible factor 1, 2, 3; PI3K, phosphatidyIinositol-4,5-bisphosphate 3-kinase; RAS, rat aarcoma
oncogene; RET, rearranged during transfection proto-oncogene; SDH, succinate dehydrogenase complex; TMEM127, transmembrane
protein 127; VHL, Von Hippel-Lindau tumor suppressor. Data from Dahlia (2014).