RFC2 and pheochromocytoma: Additionally, the Cox proportional hazards model of PFI revealed that the elevated expression of RFC2 predicted a poor PFI in ACC, KICH, KIRC, KIRP, LGG, MESO, PAAD, pheochromocytoma & paraganglioma (PCPG), PRAD, SARC, UCEC, and UVM (Fig. 6E).