Science & Nature · 3
How do tumors trigger the formation of new blood vessels required for growth beyond 1-2 millimeters?
Answer
By secreting growth factors like VEGF in response to low oxygen
Angiogenesis—the formation of new blood vessels—is essential for tumor growth beyond 1-2 cubic millimeters because tumors need oxygen and nutrients that diffusion alone cannot supply. Tumors trigger angiogenesis by secreting growth factors, particularly VEGF (vascular endothelial growth factor). Hypoxia (low oxygen levels) activates HIF-1α, a transcription factor that increases VEGF production. These growth factors induce nearby capillaries to grow into the tumor, feeding it with blood.
💡 Did you know?
Angiogenesis inhibitors block tumor blood vessels—essentially starving cancers of oxygen and nutrients.
Other options people guess
- By producing pain signals
- By creating inflammatory molecules
- By blocking immune cells
Topics
- oncology
- cancer-biology
- angiogenesis
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