Presence of somatic mutations in most early-stage pancreatic intraepithelial neoplasia.

More information is needed about genetic factors that initiate development of pancreatic intraepithelial neoplasms-the most common precursors of pancreatic ductal adenocarcinoma. We show that more than 99% of the earliest-stage, lowest-grade, pancreatic intraepithelial neoplasm-1 lesions contain mutations in KRAS, p16/CDKN2A, GNAS, or BRAF. These findings could improve our understanding of the development and progression of these premalignant lesions.

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