The level of relative gene expression of VEGF-A (Figure 1A) in the five cell lines (HME1, a control cell line with normal angiogenesis; 12Z, with ectopic endometriosis; A2780, originating in ovarian adenoma endometriosis; and RL-95-2 and SK-UT-1, which are malignant cancerous cells) used varied based on the cells’ angiogenic properties. Here, VEGFA is linked to endometriosis.