SLC15A1 and neoplasm: To explore the clinical significance of PEPT1 in HCC progression, a tissue microarray (TMA) containing 90 primary HCCs and 90 paired non‐tumor tissues were determined via IHC and scored as previously reported.[24] As shown in Figure 1D,E, the PEPT1 IHC score was notably higher in tumor tissues than that in the adjacent non‐tumor liver tissues.