KRAS and Toriello-Lacassie-Droste syndrome: In a study of four patients, three with OES and one with ECCL, four KRAS mutations were identified: c.437C > T (p.Ala146Val), c.436G > A (p.Ala146Thr), c.437C > T (p.Ala146Val), and c.436G > A (p.Ala146Thr) [15].