The most common of these are Li-Fraumeni syndrome (TP53 gene germline and somatic mutation), Lynch syndrome (MSH2, MLH1, MSH6, PMS2, EPCAM genes), multiple endocrine neoplasia type 1 (MEN1 gene), Beckwith–Wiedemann syndrome (11p151 gene, IGF-2 overexpression), familial adenomatous polyposis (FAP gene, β catenin somatic mutations), neurofibromatosis type 1 (NF1 gene) and Carney complex (PRKAR1A gene) [5,7,9]. The gene discussed is NF1; the disease is Lynch syndrome.