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Journal of Dental Research
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Clinical

PTCH1 and SMO Gene Alterations in Keratocystic Odontogenic Tumors

L.-S. Sun§, X.-F. Li§ and T.-J. Li*

Department of Oral Pathology, Hospital and School of Stomatology, Peking University, 22 South Zhongguancun Avenue, Haidian District, Beijing 100081, P.R. China

Correspondence: * corresponding author, litiejun22{at}vip.sina.com

Keratocystic odontogenic tumors (KCOTs, previously known as odontogenic keratocysts) are aggressive jaw lesions that may occur in isolation or in association with nevoid basal cell carcinoma syndrome (NBCCS). Mutations in the PTCH1 (PTCH) gene are responsible for NBCCS and are related in tumors associated with this syndrome. Mutations in the SMO gene have been identified in basal cell carcinoma and in medulloblastoma, both of which are features of NBCCS. To clarify the role of PTCH1 and SMO in KCOTs, we undertook mutational analysis of PTCH1 and SMO in 20 sporadic and 10 NBCCS-associated KCOTs, and for SMO, 20 additional cases of KCOTs with known PTCH1 status were also included. Eleven novel (1 of which occurred twice) and 5 known PTCH1 mutations were identified. However, no pathogenic mutation was detected in SMO. Our findings suggest that mutations are rare in SMO, but frequent in PTCH1 in sporadic and NBCCS-associated KCOTs. Abbreviations: NBCCS, nevoid basal cell carcinoma syndrome; KCOTs, keratocystic odontogenic tumors; BCCs, basal cell carcinomas.

Key Words: PTCH1 • SMO • nevoid basal cell carcinoma syndrome • keratocystic odontogenic tumors • PTCH

Journal of Dental Research, Vol. 87, No. 6, 575-579 (2008)
DOI: 10.1177/154405910808700616
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