FN1 and endometriosis: The concentration of FN in blood plasma samples from women with endometriosis (292.61 ± 96.17 mg/L) and fertility disorders (287.53 ± 122.68 mg/L) was significantly higher compared to the normal group 226.55 ± 91.98 mg/L (p < 0.002 and p < 0.02, respectively) (Table 2, Figure 2).