Histological assessment of the efficacy of drug-eluting beads in portal tumor thrombosis of hepatocellular carcinoma oleh Yusuke Imai, MD, Masashi Hirooka, MD, PhD, Yohei Koizumi, MD, PhD, Yoshiko Nakamura, MD, Takao Watanabe, MD, PhD, Osamu Yoshida, MD, PhD, Yoshio Tokumoto, MD, PhD, Eiji Takeshita, MD, PhD, Masanori Abe, MD, PhD, Hiroaki Tanaka, MD, PhD, Mie Kurata, MD, PhD, Sohei Kitazawa, MD, PhD, Yoichi Hiasa, MD, PhD