In vivo Analysis of Tumor Vascularization in the Rat

Katsuyoshi Hori, Maroh Suzuki, Shigeru Tanda, Sachiko Saito

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


By using transparent chambers in rats, we have directly observed tumor‐induced neovascularization in the early stage and the formation of intricate networks in Yoshida rat ascites hepatoma AH109A and Sato lung carcinoma at high magnification. We counted branching point numbers per unit area in the microvascular network with and without tumors in order to clarify the sites from which new vascular sprouts originate. Branching point number per unit area in normal tissue was 13.6 ± 7.4/0.1 mm2 in the field near a terminal arteriole, and 12.9 ± 7.3/0.1 mm2 in the field distant from a terminal arteriole. There was no significant difference between these two fields in the normal vascular network. On the other hand, in the tumor vascular network, the branching point number in the field near a terminal arteriole was 50.4 ± 12.6/0.1 mm2, and 30.1 ± 11.5/0.1 mm2 in the field distant from a terminal arteriole. The difference is highly significant (P<0.001). The frequency with which new capillaries originated from veins and venules was very low. We concluded from these results that the position from which tumor vessels originated was usually the terminal portion of a terminal arteriole.

Original languageEnglish
Pages (from-to)279-288
Number of pages10
JournalJapanese Journal of Cancer Research
Issue number3
Publication statusPublished - 1990 Mar


  • Neovascularization process
  • Starting vessel
  • Transparent chamber
  • Tumor vessel

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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