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Related Experiment Video

Updated: Feb 19, 2026

Single Droplet Digital Polymerase Chain Reaction for Comprehensive and Simultaneous Detection of Mutations in Hotspot Regions
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Multiple Hotspot Mutations Scanning by Single Droplet Digital PCR.

Charles Decraene1,2, Amanda B Silveira1, François-Clément Bidard1,3

  • 1Circulating Tumor Biomarkers Laboratory, SiRIC, Translational Research Department, Institut Curie, PSL Research University, Paris, France.

Clinical Chemistry
|November 11, 2017
PubMed
Summary

New droplet digital PCR (ddPCR) assays detect multiple KRAS and EGFR mutations in a single reaction, improving liquid biopsy accuracy for cancer monitoring and discovery. This advancement offers a powerful tool for analyzing limited patient samples.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Oncology

Background:

  • Droplet digital PCR (ddPCR) enables noninvasive monitoring of mutations with high accuracy.
  • Current assays detect a limited number of mutations per reaction.
  • The use of ddPCR as a discovery tool for unknown mutations is limited.

Purpose of the Study:

  • To establish novel ddPCR assays for detecting all genomic alterations within KRAS exon 2 and EGFR exon 19 mutation hotspots.
  • To enhance the capability of ddPCR for comprehensive mutation detection in cancer diagnostics.

Main Methods:

  • Developed two ddPCR assays using unique TaqMan oligoprobes.
  • The KRAS assay detected 7 common mutations in codons 12/13 and all other mutations in the region.
  • The EGFR assay screened for all in-frame deletions in exon 19.

Main Results:

  • Both KRAS and EGFR assays demonstrated high specificity.
  • The limit of detection for both assays was <0.1% mutant allele frequency.
  • Assays were validated on plasma and formalin-fixed, paraffin-embedded tumor samples.

Conclusions:

  • The developed method allows detection of a higher number of mutations per ddPCR reaction.
  • This approach minimizes patient sample consumption, crucial for liquid biopsies with low circulating tumor DNA.
  • The method is valuable for mutation discovery when tumor tissue is unavailable and for disease monitoring during therapy.