BCL2A1 and hepatocellular adenoma: However, after the development of inflammation in the membranous trophoblast of chorion (group-3), there is a continuous increase in the percent of BCL2A1-positive cells according to the stage progression of acute HCA in the EPM (median value; group-3 vs. group-4 vs. group-5, 43.57 vs. 48.62 vs. 71.07) (Figure 2).