IDH2 and carcinoma: The eight stringent markers (Figure 4b) showed a cell type‐restricted expression pattern: CD68, FCGR1A, LILRB1 and MRC1 are expressed in the ascitic milieu only by macrophages, TACSTD2 (also known as TROP‐2) and ITGB8 by malignant carcinoma cells, FAS by fibroblasts and IDH2 predominantly by B‐lymphocytes and erythrocytes.