Resistance to antiangiogenic therapy

Area of Science:

• Neuro-oncology
• Cancer therapy
• Molecular biology

Background:

• Antiangiogenic therapy yields high radiographic response rates in recurrent glioblastoma.
• However, these therapies have not translated into significant improvements in overall survival.
• This discrepancy necessitates a deeper understanding of resistance mechanisms.

Purpose of the Study:

• To investigate the mechanisms of adaptive (evasive) and intrinsic (pre-existing) resistance to antiangiogenic therapy in glioblastoma.
• To explore the role of the tumor microenvironment in determining optimal antiangiogenic dosing.
• To highlight the ongoing efforts in optimizing antiangiogenic therapy as an adjunct treatment.

Main Methods:

• Review of current literature on antiangiogenic therapy resistance in glioblastoma.
• Analysis of proposed mechanisms of adaptive and intrinsic resistance.
• Examination of the tumor microenvironment's influence on treatment response.

Main Results:

• Multiple mechanisms contribute to both adaptive and intrinsic resistance to antiangiogenic therapy.
• The tumor microenvironment plays a crucial role in treatment efficacy and resistance.
• Durable responses remain a challenge, but angiogenesis inhibitors have a role in high-grade gliomas.

Conclusions:

• Understanding resistance mechanisms is critical for improving antiangiogenic therapy outcomes.
• Targeting the tumor microenvironment may enhance treatment effectiveness.
• Optimizing antiangiogenic therapy in combination with radiation and chemotherapy is a key area of ongoing research.