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Angiogenesis in pituitary adenomas.

Shozo Yamada1, Kouji Takada

  • 1Department of Neurosurgery, Toranomon Hospital, Tokyo 105-8470 Japan. syamadays11@hotmail.com

Microscopy Research and Technique
|January 23, 2003
PubMed
Summary

Pituitary adenomas show lower blood vessel formation (angiogenesis) than normal pituitary tissue, potentially explaining their slow growth and rare metastasis. Further research is needed to clarify angiogenesis factors in these tumors.

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Area of Science:

  • Endocrinology
  • Oncology
  • Vascular Biology

Background:

  • Angiogenesis, the formation of new blood vessels, is crucial for tumor growth and metastasis.
  • Pituitary adenomas are tumors of the pituitary gland, and their angiogenic properties are not fully understood.

Purpose of the Study:

  • To review the role of angiogenesis in pituitary adenomas.
  • To analyze the relationship between microvessel density and tumor behavior in pituitary adenomas.
  • To discuss the involvement of angiogenesis factors like VEGF and bFGF in pituitary tumors.

Main Methods:

  • Assessment of tumor microvessel density using immunohistochemical markers.
  • Review of studies examining microvessel density in relation to tumor type, invasiveness, and proliferative markers (MIB-1/Ki-67).
  • Analysis of studies on angiogenesis factors such as vascular endothelial growth factor (VEGF) and basic fibroblast growth factor (bFGF) in pituitary tissues.

Main Results:

  • Pituitary adenomas exhibit significantly lower vascular densities compared to nontumorous adenohypophysis.
  • This reduced angiogenesis may contribute to the slow growth and rarity of metastases in pituitary tumors.
  • Conflicting conclusions exist regarding the relationship between microvessel density and various tumor factors, necessitating further investigation.

Conclusions:

  • Angiogenesis plays a complex role in pituitary adenomas.
  • Lower vascular density in pituitary adenomas suggests a unique angiogenic profile compared to other tumors.
  • Further research is essential to elucidate the precise mechanisms and therapeutic implications of angiogenesis in pituitary adenomas, including the roles of VEGF and bFGF.

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