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Antiangiogenesis: Vessel Regression, Vessel Normalization, or Both?

Hellmut G Augustin1,2, Gou Young Koh3,4

  • 1Division of Vascular Oncology and Metastasis, German Cancer Research Center Heidelberg (DKFZ-ZMBH Alliance), Heidelberg, Germany. augustin@angioscience.de.

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Antiangiogenic therapy initially aimed to stop tumor growth by inhibiting blood vessel formation. However, combining these drugs with chemotherapy proved more effective, leading to the vessel normalization concept.

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Area of Science:

  • Oncology
  • Vascular Biology
  • Translational Research

Background:

  • Antiangiogenic tumor therapy was initially designed to induce tumor dormancy by inhibiting blood vessel formation.
  • Clinical trials showed limited efficacy of monotherapy with angiogenesis inhibitors, but improved survival when combined with chemotherapy.
  • This led to the 'vessel normalization' hypothesis: pruning immature vessels to improve chemotherapy delivery.

Purpose of the Study:

  • To provide historical context for the concept of tumor vessel normalization.
  • To identify critical unanswered questions in translational angiogenesis research.
  • To advance the application of tumor vascular stroma reprogramming therapies.

Main Methods:

  • This is a landmark commentary, not an experimental study.
  • It reviews the historical development and current understanding of antiangiogenic therapy and vessel normalization.
  • It synthesizes existing knowledge to pose key research questions.

Main Results:

  • The efficacy of antiangiogenic therapy is complex, with both vessel regression and normalization potentially contributing.
  • Despite extensive research since 2004, the precise roles of vessel regression versus normalization in clinical efficacy remain unclear.
  • Further research is needed to optimize antiangiogenic strategies.

Conclusions:

  • The clinical benefit of antiangiogenic therapy likely involves a balance between vessel regression and normalization.
  • Clarifying the contribution of each mechanism is crucial for advancing tumor vascular stroma reprogramming.
  • Addressing key translational research questions will improve patient outcomes.