“…Uterine leiomyomas (fibroids) are benign tumors of uterine smooth muscle cells characterized by deposition of excessive, disorganized extracellular matrix (ECM) (Al-Hendy et al, 2017;Commandeur et al, 2015;Doherty et al, 2014;Stewart et al, 2016). Studies have shown four major mutually exclusive clonal genetic mutations in leiomyomas: $70% of cases harbor MED12 mutations, either missense or small in-frame insertions or deletion in exon 2 (Je et al, 2012;Mä kinen et al, 2011;McGuire et al, 2012;Mehine et al, 2014), while high mobility group AT-hook 1 and 2 (HMGA1 and HMGA2) rearrangements occur in another 15% (Ferrero, 2019;Meloni et al, 1992;Nibert and Heim, 1990;Rein et al, 1991). Biallelic inactivation of fumarate hydratase (FH) (Tomlinson et al, 2002) and collagen type IV alpha 5 and collagen type IV alpha 6 (COL4A5-COL4A6) deletions are also found in some cases (Mehine et al, 2016).…”