The IDFGFR1-CNS kit is an in vitro diagnostic test designed to detect and quantify, by digital PCR, three variants (N546K c.1638 C>A and c.1638 C>G and K656E c.1966 A>G) and FGFR1 (fibroblast growth factor receptor 1)internal tandem duplication of the tyrosine kinase domain (exon 11 -18) in one reaction for each sample.

Mutations in the tyrosine-kinase receptor Fibroblast growth factor receptor 1 (FGFR1), lead to constitutive activation of the MAP-kinase pathway in pilocytic astrocytomas.

In contrast to the FGFR1 amplification, frequently observed in breast, ovary, and lung cancer, gene fusions and duplications are described at low frequencies in brain tumors such as glioblastomas and pediatric diffuse astrocytomas, respectively.

In pilocytic astrocytomas, the main described alterations of FGFR1 are point mutations in the hotspot tyrosine kinase region, affecting mainly the codons 546 (p.N546K) and 656 (p.K656E) of the gene in extracerebellar pilocytic astrocytomas. FGFR1 internal tandem duplication (ITD) of the tyrosine-kinase domain (FGFR1-ITD), another genetic alteration that also leads to MAP kinase pathway alteration, has been reported in low grade neuroepithelial tumors. FGFR1 alteration mainly represented by FGFR1-ITD is a frequent event in dysembryoplastic neuroepithelial tumors.

This kit can be used on circulating DNA and DNA isolated from formaldehyde-fixed and paraffin-embedded tissues (FFPE).

It is compatible with the following instruments: Digital droplet PCR QX200 (Biorad) and Naica system digital droplet PCR (Stilla). For others, please contact us.

This kit can be sold included in the IDPCTC panel.

Reference and formatIDFGFR1(b) CNS-25 or IDFGFR1(s) CNS-25 (N546K, K656E, FGFR1 duplication) (25 preps)
IDPCTC panel (25 preps)
MatrixCirculating DNA extracted from plasma and FFPE
Application digital PCR (dPCR)
Duration of the protocol4h (QX200-96 samples) and 2h (Naica-12 samples)
Storage temperature-20°C
Stability1 year

Associated consumables

  • IDXtract, silica-based extraction and purification kit of total circulating DNA
  • IDXtract-MAG, magnetic beads-based extraction and purification kit of total circulating DNA
  • IDxtract-MAG-FFPE, DNA extraction and purification kit from formalin-fixed and paraffin-embedded samples (FFPE)


Characteristics of IDFGFR1 kit


Results obtained in digital PCR using IDFGFR1 on synthetic DNA carrying mutations of FGFR1 :

– N564K, K656E mutations and the internal tamdem duplication of FGFR1



The IDFGFR1 kit has been validated for the detection of N564K, K656E mutations and the internal tamdem duplication of FGFR1 present on FFPE extracted DNA in comparison with NGS.




Documentation on request to