EGFR C797S, EGFR T790M and EGFR sensitizing mutations in non-small cell lung cancer revealed by six-color crystal digital PCR
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Jordan Madic1,*, Cécile Jovelet2,*, Julien Lopez1, Barbara André1, Jean Fatien3, Isabelle Miran2, Aurélie Honoré2, Laura Mezquita5, Benjamin Besse5, Ludovic Lacroix2,4,* and Magali Droniou1,*
1Stilla Technologies, 1 Mail du Professeur Georges Mathé, Villejuif, France
2Plateforme de Génomique, Module de Biopathologie Moléculaire et Centre de Ressources Biologiques, AMMICa, INSERM US23/CNRS UMS3655, Gustave Roussy, Villejuif, France
3Ecole Polytechnique, Route de Saclay, Palaiseau, France
4Département de Biologie et Pathologie Médicales, Institut Gustave Roussy, Villejuif, France
5Département d’Oncologie Médicale, Gustave Roussy, Villejuif, France
*These authors have contributed equally to this work
Magali Droniou, email: firstname.lastname@example.org
Keywords: EGFR; multiplexing; monitoring; NSCLC; digital PCR
Received: June 21, 2018 Accepted: November 26, 2018 Published: December 21, 2018
Background: Detection of EGFR sensitizing and p.T790M and p.C797S resistance mutations is particularly important for non-small cell lung cancer (NSCLC) patient therapy management. Non-invasive blood-based monitoring of these mutations may pave the way to a fine-tuned personalized treatment. Digital PCR has emerged as an extremely sensitive method to detect rare mutations, however its major limitation is the number of hotspots that can be simultaneously differentiated.
Methods: We developed a 6-color digital PCR assay for the detection and quantification of 19 most prevalent EGFR sensitizing and resistance mutations and evaluated this assay on 82 tumor and plasma samples from NSLC patients.
Results: Limits of detection (LOD) for the 6-color digital PCR assay were assessed on serial dilutions of DNA standards. We found that the 6-color assay enabled detection of mutant fractions as low as 1 mutant in 1025 wild-type molecules, depending on the mutation targeted, when assayed in a background of 10 000 wild-type DNA copies. EGFR mutant allelic fraction was also measured on tumor and plasma samples by 6-color digital PCR, and displayed a highly significant correlation with next generation sequencing and 3-color digital PCR. Lastly, the 6-color digital PCR assay was performed on several longitudinal plasma samples from four patients and revealed levels of sensitizing and resistance EGFR mutations that reflected well the course of the disease.
Conclusion: This 6-color Crystal digital PCR assay could represent a robust solution using digital PCR for the monitoring of EGFR mutations.
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