S100A9 and clear cell renal carcinoma: While monocyte markers (VCAN and S100A9) mapped to cluster 18, cluster 4 cells expressed dendritic cell markers (CD1C and CLEC10A) as well as macrophage markers associated with disease recurrence in clear cell renal cell carcinoma (C1QB, TREM2, and APOE)80 (Fig. 7b).