ACTA1 and neoplasm: Since it has been reported that B7-H3 is expressed in tumor cells as well as in various immune cells, including endothelial cells, natural killer cells, B cells, macrophages, dendritic cells, and fibroblasts (8–12), we examined the expression of B7-H3 in stromal (case 12) and tumor (case 76) cells together with the expression of the immune cell markers CD19, CD11c, CD68, CD31, and α-SMA in serial sections (Figures 2A–L).