MARCO and hepatocellular carcinoma: For SLC40A1-expressing macrophages in each dataset, we calculated the percentage of cells expressing CD5L, CETP, MARCO, and CFP. Our data showed that > 35% of macrophages in the normal liver dataset but < 16% of macrophages in the HCC dataset expressed CETP, MARCO, and CFP (Additional file 1: Table S10).