VEGFA and cervical cancer: Chiarotto used different oxygen concentrations to verify the upregulation of VEGF mRNA in three cervical cancer cell lines (O2 concentrations of 21%, 6.25%, 4.85%, 3.46%, 2.11%, 1.57%, 1.00%, and 0%), demonstrating that the presence of VEGF mRNA may be a marker of hypoxia.31