ABCG2 and cancer: Figures 2C, 3C shows the results of the metabolite hierarchy clustering with significant differences in the sample group. The results showed that the choline metabolism in cancer and biosynthesis of unsaturated fatty acids were significantly changed between cumulus cells of endometriosis patients and control (Figure 2C), while the choline metabolism in cancer, glycerophospholipid metabolism, purine metabolism, and ABC transporters were significantly changed between MGCs of endometriosis patients and control (Figure 3C).