Alpha fetoprotein (AFP) was used as HCC tumor marker, and the staining results revealed that comparable levels of AFP in DEN/CCl4‐treated AlbCre; MCT1 f/f and MCT1 f/f mice (Figure 5A,B), indicating that liver‐specific MCT1 deletion was not sufficient to modify the severity of DEN/CCl4‐induced HCC tumors. Here, AFP is linked to neoplasm.