Somatic deletion of the 5’ ends of both the COL4A5 and COL4A6 genes in a sporadic leiomyoma of the esophagus. - Heidet,L.; Boye,E.; Cai,Y.; Sado,Y.; Zhang,X.; Flejou,J.F.; Fekete,F.; Ninomiya,Y.; Gubler,M.C.; Antignac,C. (Amer J Pathol, 1998)