KRT18 and hepatocellular carcinoma: Figure 2M shows that all of HCC HepG2 cells are heteroploid and CK18+, whereas a cluster of 2 heteroploid HepG2 CTCs in a CTM enriched from the blood of a mouse tumor model which was established with the exact same HepG2 cell line reveals non-detectable CK18 (Figure 2N).