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Updated: Sep 27, 2026

Monitoring Functionality and Morphology of Vasculature Recruited by Factors Secreted by Fast-growing Tumor-generating Cells
Published on: November 23, 2014
Role of angiogenesis in tumor growth and metastasis
1Departments of Surgery and Cell Biology, Harvard Medical School, Boston, MA, USA.
Abstract:
Angiogenesis is required for invasive tumor growth and metastasis and constitutes an important point in the control of cancer progression. Its inhibition may be a valuable new approach to cancer therapy. Avascular tumors are severely restricted in their growth potential because of the lack of a blood supply. For tumors to develop in size and metastatic potential they must make an "angiogenic switch" through perturbing the local balance of proangiogenic and antiangiogenic factors. Frequently, tumors overexpress proangiogenic factors, such as vascular endothelial growth factor, allowing them to make this angiogenic switch. Two strategies used in the development of antiangiogenic agents involve the inhibition of proangiogenic factors (eg, anti-vascular endothelial growth factor monoclonal antibodies) as well as therapy with endogenous inhibitors of angiogenesis, such as endostatin and angiostatin. Therapy with endogenous angiogenic inhibitors such as endostatin and angiostatin may reverse the angiogenic switch preventing growth of tumor vasculature. Preclinical studies have shown that endostatin effectively inhibits tumor growth and shrinks existing tumor blood vessels. Phase 1 clinical trials of endostatin and angiostatin are ongoing, and preliminary results show minimal toxicities.
Insights
Inhibiting tumor angiogenesis, the process of new blood vessel formation, is a promising cancer therapy. Endogenous inhibitors like endostatin and angiostatin show potential in preclinical and early clinical studies with minimal toxicity.
Area of Science:
- Oncology
- Cancer Biology
- Vascular Biology
Background:
- Angiogenesis is crucial for tumor growth, invasion, and metastasis.
- Tumors require an "angiogenic switch" to develop beyond a minimal size.
- Dysregulation of proangiogenic and antiangiogenic factors drives tumor vascularization.
Purpose of the Study:
- To explore the therapeutic potential of inhibiting tumor angiogenesis.
- To evaluate the efficacy of endogenous angiogenesis inhibitors.
- To assess the safety and preliminary results of endostatin and angiostatin in clinical trials.
Main Methods:
- Investigating strategies for anti-angiogenic agent development.
- Utilizing endogenous inhibitors such as endostatin and angiostatin.
- Conducting preclinical studies and Phase 1 clinical trials.
Main Results:
- Endogenous inhibitors like endostatin and angiostatin can reverse the angiogenic switch.
- Preclinical data demonstrate endostatin's effectiveness in inhibiting tumor growth and reducing tumor vasculature.
- Phase 1 clinical trials of endostatin and angiostatin indicate minimal toxicity.
Conclusions:
- Inhibition of angiogenesis represents a viable strategy for cancer treatment.
- Endogenous angiogenesis inhibitors offer a promising therapeutic avenue.
- Endostatin and angiostatin show encouraging safety and efficacy profiles in early clinical evaluation.
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