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01-04-2010 | Preclinical study

Phosphatidylinositol-3-kinase and AKT1 mutations occur early in breast carcinoma

Authors: Jennifer Dunlap, Claudia Le, Arielle Shukla, Janice Patterson, Ajia Presnell, Michael C. Heinrich, Christopher L. Corless, Megan L. Troxell

Published in: Breast Cancer Research and Treatment | Issue 2/2010

Abstract

Mutationally activated protein kinases are appealing therapeutic targets in breast carcinoma. Mutations in phosphatidylinositol-3-kinase (PI3KCA) have been described in 8–40% of invasive breast carcinomas, and AKT1 mutations have been characterized in 1–8% of breast carcinomas. However, there is little data on these mutations in breast precursor lesions. To further delineate the molecular evolution of breast tumorigenesis, samples of invasive breast carcinoma with an accompanying in situ component were macro dissected from formalin-fixed paraffin embedded tissue and screened for mutations in PIK3CA exons 7, 9, 20, and AKT1 exon 2. Laser capture micro dissection (LCM) was performed on mutation-positive carcinomas to directly compare the genotypes of separated invasive and in situ tumor cells. Among 81 cases of invasive carcinoma, there were eight mutations in PIK3CA exon 20 (7 H1047R, 1 H1047L) and four mutations in exon 9 (2 E545K, 1 E542K, 1 E545G), totaling 12/81 (14.8%). In 11 cases examined, paired LCM in situ tumor showed the identical PIK3CA mutation in invasive and in situ carcinoma. Likewise, 3 of 78 (3.8%) invasive carcinomas showed an AKT1 E17K mutation, and this mutation was identified in matching in situ carcinoma in both informative cases. Mutational status did not correlate with clinical parameters including hormone receptor status, grade, and lymph node status. The complete concordance of PIK3CA and AKT1 mutations in matched samples of invasive and in situ tumor indicates that these mutations occur early in breast cancer development and has implications with regard to therapeutics targeted to the PI3 kinase pathway.

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Title: Phosphatidylinositol-3-kinase and AKT1 mutations occur early in breast carcinoma
Authors: Jennifer Dunlap
Claudia Le
Arielle Shukla
Janice Patterson
Ajia Presnell
Michael C. Heinrich
Christopher L. Corless
Megan L. Troxell
Publication date: 01-04-2010
Publisher: Springer US
Published in: Breast Cancer Research and Treatment / Issue 2/2010
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI: https://doi.org/10.1007/s10549-009-0406-1

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