Frequency and clinicopathologic profile of PIK3CA mutant GISTs: molecular genetic study of 529 cases

Modern Pathology : an Official Journal of the United States and Canadian Academy of Pathology, Inc
J LasotaM Miettinen

Abstract

Gastrointestinal stromal tumors (GISTs) are mesenchymal tumors usually driven by the mutational activation of receptor tyrosine kinases, KIT, or PDGFRA. Oncogenic activation of phosphatidylinositide-3-kinase (PI3K), a downstream effector in the KIT signaling pathway, has been identified in different types of cancer, with the PI3K 110α subunit encoded by PIK3CA being a common mutational target. In this study, the mutational hotspot in the PIK3CA kinase domain encoded by exon 20 was evaluated in 529 imatinib-naive GISTs using PCR amplification and Sanger sequencing. Eight mutations (two co-existing in one tumor) were identified. Subsequently, The cobas PIK3CA Mutation Test was employed to evaluate mutational hotspots in exons 1, 4, 7, and 9 in 119 PIK3CA exon 20-wild type tumors. In two cases, mutations in exons 1 and 9 were identified. In one GIST, previously undetected by Sanger sequencing, the exon 20 mutation was discovered. Altogether, eight primary and two metastatic GISTs carried PIK3CA mutations. The size of primary PIK3CA-mutant GISTs was ≥14 cm (mean size 17 cm), and mitotic activity varied from 0 to 72 per 50HPF (mean 5/50HPF). Follow-up data showed short survival in 6 of 7 studied cases. Detection of PIK3CA mutations ...Continue Reading

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Citations

Mar 14, 2017·The American Journal of Surgical Pathology·Markku MiettinenJerzy Lasota
Aug 5, 2017·Applied Immunohistochemistry & Molecular Morphology : AIMM·Jerzy LasotaMarkku Miettinen
Apr 19, 2017·Journal of Breath Research·Renata WawrzyniakMichał J Markuszewski
Jul 19, 2016·Pathology International·Ryuichi WadaZenya Naito
Nov 8, 2017·Expert Review of Anticancer Therapy·Agnieszka WozniakPatrick Schöffski
Oct 2, 2019·Laboratory Investigation; a Journal of Technical Methods and Pathology·Peifeng LiZhe Wang
Feb 3, 2021·Diagnostics·Iva BrčićBernadette Liegl-Atzwanger
Jul 4, 2020·Translational Oncology·Haixin Zhang, Qi Liu
May 21, 2021·Frontiers in Endocrinology·Georgia PitsavaConstantine A Stratakis

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