Discrimination between leiomyoma and leiomyosarcoma of the stomach: Endoscopic ultrasonography or proliferation marker?: M. Yuki∗, K. Yokota∗, S. Okuyama∗, T. Ohta∗, S. Izumi∗, R. Shudo∗, A. Uehara∗, S. Kitamori∗, Y. Kohgo∗, T. Nakamura∗∗. ∗Dept. of Internal Medicine (III), Asahikawa Medical College, Asahikawa, Japan. ∗∗ABL-Basic Research Program, Frederick Cancer Research and Development Center, Frederick, MD 21702