ARF(26–44), cell-permeable is a cell-penetrating peptide derived from a specific amino acid sequence of the p14ARF tumor suppressor protein. As a functional inhibitor of FoxM1, ARF(26–44) cell-permeableshows significant anti-tumor activity in the treatment of mouse hepatocellular carcinoma (HCC), significantly increasing tumor cell apoptosis and reducing tumor cell proliferation and angiogenesis. ARF(26–44), cell-permeable can be used in research on tumor therapy.