TY - JOUR T1 - Malignant myoepithelioma arising in adenomyoepithelioma of the breast and coincident multiple gastrointestinal stromal tumours in a patient with neurofibromatosis type 1 JF - Journal of Clinical Pathology JO - J Clin Pathol SP - 653 LP - 655 DO - 10.1136/jcp.2008.063628 VL - 62 IS - 7 AU - L Hegyi AU - K Thway AU - R Newton AU - P Osin AU - A Nerurkar AU - A J Hayes AU - C Fisher Y1 - 2009/07/01 UR - http://jcp.bmj.com/content/62/7/653.abstract N2 - A 41-year-old female patient with neurofibromatosis type 1 (NF-1) presented with a breast lump and anaemia related to gastrointestinal bleeding. She was found to have malignant myoepithelioma of the breast and simultaneously multiple gastrointestinal stromal tumours (GISTs) of the small bowel. Molecular studies showed a silent germline mutation in exon 9 of the KIT gene of both tumours. The common gene mutations characteristic of sporadic GISTs were not identified in these tumours, consistent with the literature, suggesting that gene mutations in GISTs are either absent or late events in patients with NF-1. ER -