PIK3CA mutation enrichment and quantitation from blood and tissue

Ieva Keraite, Virginia Alvarez-Garcia, Isaac Garcia-Murillas, Matthew Beaney, Nicholas C. Turner, Clare Bartos, Olga Oikonomidou, Maïwenn Kersaudy-Kerhoas, Nicholas R. Leslie

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)
100 Downloads (Pure)


PIK3CA is one of the two most frequently mutated genes in breast cancers, occurring in 30-40% of cases. Four frequent 'hotspot' PIK3CA mutations (E542K, E545K, H1047R and H1047L) account for 80-90% of all PIK3CA mutations in human malignancies and represent predictive biomarkers. Here we describe a PIK3CA mutation specific nuclease-based enrichment assay, which combined with a low-cost real-time qPCR detection method, enhances assay detection sensitivity from 5% for E542K and 10% for E545K to 0.6%, and from 5% for H1047R to 0.3%. Moreover, we present a novel flexible prediction method to calculate initial mutant allele frequency in tissue biopsy and blood samples with low mutant fraction. These advancements demonstrated a quick, accurate and simple detection and quantitation of PIK3CA mutations in two breast cancer cohorts (first cohort n = 22, second cohort n = 25). Hence this simple, versatile and informative workflow could be applicable for routine diagnostic testing where quantitative results are essential, e.g. disease monitoring subject to validation in a substantial future study.

Original languageEnglish
Article number17082
JournalScientific Reports
Publication statusPublished - 13 Oct 2020

ASJC Scopus subject areas

  • General


Dive into the research topics of 'PIK3CA mutation enrichment and quantitation from blood and tissue'. Together they form a unique fingerprint.

Cite this