Multiple sporadic gastrointestinal stromal tumors concomitant with ampullary adenocarcinoma: A case report with KIT and PDGFRA mutational analysis and miR-221/222 expression profile

Stella Blandamura, Lara Alessandrini, Roberta Bertorelle, Francesca Simonato, Vincenza Guzzardo, Elisa Valentini, Imerio Angriman, Ambrogio Fassina

Research output: Contribution to journalArticlepeer-review

Abstract

GISTs originating multifocally at different GI sites, in patients lacking familial syndromes, could be interpreted as recurrent/metastatic disease. MiR-221/222 have recently been identified as regulators of KIT expression in GISTs. We report the first case of synchronous GISTs in the stomach and duodenum concomitant with an ampullary adenocarcinoma. Different CD117 expression patterns could be related to different KIT mutational status in the two lesions: gastric GIST showed a dot-like pattern and lacked KIT mutations; duodenal GIST had a strong membranous expression pattern, likely due to KIT exon 9 duplication, which is associated with lower response to imatinib. MiR-221/222 were downregulated in GISTs as compared with normal tissue (p

Original languageEnglish
Pages (from-to)392-396
Number of pages5
JournalPathology Research and Practice
Volume210
Issue number6
DOIs
Publication statusPublished - 2014

Keywords

  • Adenocarcinoma
  • GISTs
  • MiR-221/222
  • Mutation
  • Polyclonality

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Cell Biology
  • Medicine(all)

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