MIB1 and hepatic angiomyolipoma: In contrast, the rates of occurrence of high MIB-1 index values (> 10%) were 13% (1/8) in skin PEComa, 0% (0/12) in pancreatic PEComa, and 4% (1/26) in liver PEComa (Charli-Joseph et al. 2014; Zhang et al. 2017, 2021).