title: Intra-peritoneal administration of paclitaxel with non-animal stabilized hyaluronic acid as a vehicle--a new strategy against peritoneal dissemination of gastric cancer.
abstract: OBJECTIVE
  Intra-peritoneal administration (i.p.) of Taxanes has recently been reported to be effective for the treatment of peritoneal dissemination, presumably because extremely high concentration of the drug is achievable onto the disseminated nodules as compared to intra-venous administration. Here, we aimed to investigate the ability of non-animal stabilized hyaluronic acid (NASHA) to retain the anti-cancer drugs in the peritoneal cavity, and, consequently, improve the efficacy of i.p. administration of paclitaxel.
  
  
  METHODS
  Mice were inoculated i.p. with MKN45P gastric cancer cells. The mice received i.p. administrations of paclitaxel, without or with NASHA, once a week for 3 consecutive weeks, and the intra-peritoneal nodules were counted after 4 weeks. The ability of NASHA to retain the i.p. administered liquid and paclitaxel in abdominal cavity was also investigated. Finally, the concentration of paclitaxel in metastatic nodule was measured with HPLC.
  
  
  RESULTS
  In the group receiving paclitaxel with NASHA, the number of disseminated nodules were significantly smaller than in those receiving paclitaxel without NASHA. The fluid volumes and concentration of paclitaxel recovered from the abdominal cavity as well as the concentrations of paclitaxel in metastatic nodule were significantly increased by the addition of NASHA.
  
  
  CONCLUSIONS
  Our results indicate that NASHA improves the exposure time of i.p. administrated paclitaxel to disseminated nodules by retaining the drug in the abdominal cavity. Since the material is used in cosmetic surgery with few adverse effects, NASHA can be clinically used as the vehicle for the i.p. administration of anti-cancer agents for advanced gastric cancer with peritoneal dissemination.
authors.affiliation: Department of Surgical Oncology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan. jymda-tky@umin.ac.jp
authors.forename: Jun
authors.initials: J
authors.lastname: Yamada
authors.forename: Joji
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authors.lastname: Kitayama
authors.forename: Nelson H
authors.initials: NH
authors.lastname: Tsuno
authors.forename: Hiroharu
authors.initials: H
authors.lastname: Yamashita
authors.forename: Hideyo
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authors.lastname: Miyato
authors.forename: Daisuke
authors.initials: D
authors.lastname: Soma
authors.forename: Kensuke
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authors.lastname: Otani
authors.forename: Takao
authors.initials: T
authors.lastname: Kamei
authors.forename: Hironori
authors.initials: H
authors.lastname: Ishigami
authors.forename: Akio
authors.initials: A
authors.lastname: Hidemura
authors.forename: Shoichi
authors.initials: S
authors.lastname: Kaisaki
authors.forename: Koki
authors.initials: K
authors.lastname: Takahashi
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Nagawa