Losses of chromosomes 1 p and 3 q are early genetic events in the development of sporadic pheochromocytomas. - Dannenberg,H.; Speel,E.J.; Zhao,J.; Saremaslani,P.; van Der Harst,E.; Roth,J.; Heitz,P.U.; Bonjer,H.J.; Dinjens,W.N.; Mooi,W.J.; Komminoth,P.; de Krijger,R.R. (Am J Pathol, 2000)