FN1 and breast cancer: The concentrations obtained by other researchers were in similar ranges (Fibronectin in serum in patients with epilepsy: 236.96 ± 65.7 ug/mL [36], in chronic hepatitis B (CHB) 413.26 μg/mL [37], collagen IV in patients with breast cancer: 166 ng/mL [38], and laminin-5 in serum in the lung cancer: 0.12-310 ng/mL [39]).