- An angiogenesis inhibitor E7820 shows broad-spectrum tumor growth inhibition in a xenograft model: possible value of integrin alpha2 on platelets as a biological marker. Semba, T., Funahashi, Y., Ono, N., Yamamoto, Y., Sugi, N.H., Asada, M., Yoshimatsu, K., Wakabayashi, T. Clin. Cancer Res. (2004)