The Japanese journal of surgery

, Volume 15, Issue 4, pp 279–284 | Cite as

In vitro chemosensitivity tests on human tumor xenografts by clonogenic assay: the combined use of mitomycin C with α-interferon or γ-interferon

  • Naoki Hirabayashi
  • Ken Yoshinaka
  • Yoshihiro Nosoh
  • Tetsuya Toge
  • Minoru Niimoto
  • Takao Hattori
  • Takeshi Ohkita
Original Articles

Abstract

Using the human tumor clonogenic assay technique, the effects of Mitomycin C plus either α-interferon or γ-interferon were studied against five human tumor xenografts serially transplanted into nude mice (three gastric and two colon cancers). When the survival fraction found with the drug combination was smaller than the multiplication of survival fractions with either drug alone, the combined effect was defined as synergism. Similarly, antagonistic effect was defined when the survival fraction of drug combination was larger than the larger one observed in either interferon or Mitomycin C alone. Four out of five human tumor xenografts (three gastric and one colon cancers) showed synergistic effects in combination of α-interferon with Mitomycin C. Though two gastric cancer xenografts exhibited synergistic effects in combination of γ-interferon with Mitomycin C, antagonistic effects, which was not found in combination of α-interferon with Mitomycin C, were observed in one gastric cancer and one colon cancer xenografts.

Key words

α-interferon γ-interferon clonogenic assay drug combination 

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Copyright information

© The Japan Surgical Society 1985

Authors and Affiliations

  • Naoki Hirabayashi
    • 1
  • Ken Yoshinaka
    • 1
  • Yoshihiro Nosoh
    • 1
  • Tetsuya Toge
    • 1
  • Minoru Niimoto
    • 1
  • Takao Hattori
    • 1
  • Takeshi Ohkita
    • 2
  1. 1.Department of Surgery, Research Institute for Nuclear Medicine and BiologyHiroshima UniversityHiroshimaJapan
  2. 2.Department of Hematology, Research Institute for Nuclear Medicine and BiologyHiroshima UniversityHiroshimaJapan

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