FN1 and lymphangioleiomyomatosis: The levels of fibronectin were again observed to be significantly reduced in the serum from a larger cohort of LAM patients compared to healthy control samples with a mean quantity of fibronectin found to be 24214±3200 μg/mL in LAM (n = 17) and 34833±2828 μg/mL in healthy controls (n = 11, p = 0.0377, Fig. 2A).