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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 2000 Dec;91(12):1319–1325. doi: 10.1111/j.1349-7006.2000.tb00920.x

Effective Cancer Targeting Using an Anti‐tumor Tissue Vascular Endotheliumspecific Monoclonal Antibody (TES‐23)

Yukiko Wakai 1, Junji Matsui 1, Keiichi Koizumi 1, Shin‐ichi Tsunoda 1, Hiroo Makimoto 1, Iwao Ohizumi 2, Kenji Taniguchi 2, Shin‐ichi Kaiho 2, Hiroyuki Saito 2, Naoki Utoguchi 3, Yasuo Tsutsumi 1, Shinsaku Nakagawa 1, Yoshiyuki Ohsugi 2, Tadanori Mayumi 1,✉
PMCID: PMC5926302  PMID: 11123432

Abstract

Immunoconjugate targeting of solid tumors has not been routinely successful because the endothelial cells of blood vessels act as a physical barrier against the transport of macromolecules, such as antibodies. In the present study, we attempted to achieve tumor vascular targeting with an antitumor tissue endothelium‐specific monoclonal antibody (TES‐23). TES‐23, an IgG1 monoclonal antibody raised against rat KMT‐17 fibrosarcoma‐derived endothelial cells, was covalently conjugated with neocarzinostatin (NCS) in a previous study. The TES‐23‐NCS conjugate induced tumor hemorrhagic necrosis, and showed marked anti‐tumor effects against rat KMT‐17 fibrosarcoma. This result prompted us to investigate whether this approach would be applicable to various other types of solid tumors. One hour after injection of 125I‐labeled TES‐23 into BALB/c mice bearing Meth‐A fibrosarcoma and Colon 26 adenocarcinoma, the tumor accumulation of TES‐23 was greater than that of the control IgG. In the present study, we report the anti‐tumor effects of this monoclonal antibody in mice bearing Meth‐A fibrosarcoma. Mice treated with the immunoconjugate showed improved survival with no side effects. This result indicates that common antigens may be found in different kinds of tumor endothelial cells, and that TES‐23 might recognize these antigens.

Keywords: Tumor vascular endothelium, Immunoconjugate, Cancer targeting therapy, Immunoconjugates

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