About FLT3
No gene-level summary was recorded for this case.
No variant summary was recorded for this case.
Five-step scale from benign to pathogenic. This variant is likely pathogenic. Select a step to read what it means.
Likely pathogenic.A likely pathogenic classification under the recorded framework.
Gene-level background from the recorded interpretation.
Words with a dotted underline have a short definition. Hover or tap them.No gene-level summary was recorded for this case.
The recorded framework is Local FLT3 ITD / activating length-mutation framework. The criteria and strengths shown below come from the saved assessment; this page does not recalculate the classification.
The applied criteria and their strengths are shown as assessed under the stated framework.
OncoKB reports exact-variant Likely Oncogenic with Likely Gain-of-function for p.(Y597_E598insDLPVTGSSDNEYFYVDFREY). The broader FLT3 ITD literature (PMID:9737679, PMID:11090077, PMID:11756186) establishes constitutive activation of the FLT3 kinase as the canonical mechanism for juxtamembrane ITDs. Per the local FLT3 custom framework, this exact-variant OncoKB functional/mechanistic annotation together with class-level FLT3 ITD activation literature is sufficient for PS3_Supporting.
The variant maps to codons 597-598 in the FLT3 juxtamembrane domain, which lies within the well-established ITD activating hotspot cluster at codons 589-599. Mutalyzer normalization (NM_004119.3:c.1793_1794ins[CCTTCCT;1741_1793]) confirms this is a tandem duplication event producing an in-frame ITD in the canonical juxtamembrane region. This region is a critical functional domain where no benign population variation is observed (absent from gnomAD v2.1 and v4.1). The literature consistently identifies this region as a recurrent mutational hotspot in AML where ITDs constitutively activate FLT3 kinase (PMID:9737679 reported 47/51 FLT3 ITDs in codons 589-599). Per the local FLT3 custom framework, PM1_Moderate is applicable.
The variant is absent from gnomAD v2.1 and v4.1 (population databases encompassing >250,000 alleles), meeting the PM2 threshold of allele frequency <0.1% in all populations. This variant has not been observed in any healthy population cohort.
Per the local FLT3 custom framework extension of PM5 beyond missense-only wording: this is a novel in-frame ITD at codons 597-598 that falls within the established activating juxtamembrane ITD hotspot class (codons 589-599). Multiple prior pathogenic/oncogenic FLT3 ITDs are established for this hotspot (PMID:9737679 documented 47/51 ITDs in this region). The exact inserted sequence need not have been previously characterized; the event is clearly an ITD / activating length-mutation analogue in the same hotspot mechanism as prior established pathogenic FLT3 ITDs.
No benign criterion marked as applied in the recorded assessment.
Two Moderate criteria (PM1, PM5) plus two Supporting criteria (PS3, PM2) are met. The local FLT3 ITD custom framework classifies '2 Moderate + >=2 Supporting' as Likely Pathogenic. No benign criteria are met.
Evidence summaries and captured source records, where available. Missing entries should not be interpreted as negative findings.
gnomAD v4.1 allele counts were not recorded for this variant.
Absent from gnomAD v2.1.
Recorded SpliceAI maximum delta score: 0.450. Refer to the recorded PP3/BP4 rationale for interpretation.
A ClinVar laboratory submission summary was not recorded.
OncoKB identified variant-specific curated literature and context relevant to functional review; biological-effect context: Likely Gain-of-function; curated oncogenicity label: Likely Oncogenic.
This variant has not previously been reported in somatic cancers (COSMIC).
This variant does not lie in a statistically significant hotspot.
ACMG/AMP criteria under Local FLT3 ITD / activating length-mutation framework, with the data and sources behind each one.
29 criteria with recorded statuses: 4 met · 3 not met · 0 not assessed · 22 not applicable. Open any row for the full reasoning, the rule and the evidence behind it.
NM_004119.3:c.1792_1793insACCTTCCTGTGACCGGCTCCTCAGATAATGAGTACTTCTACGTTGATTTCAGAGAATATG (p.Tyr597_Glu598insAspLeuProValThrGlySerSerAspAsnGluTyrPheTyrValAspPheArgGluTyr) is a novel 20-amino-acid in-frame internal tandem duplication (ITD) in the FLT3 juxtamembrane domain at codons 597-598, within the well-established ITD activating hotspot (codons 589-599).
PM1_Moderate is met because the variant maps to the FLT3 juxtamembrane ITD hotspot (codons 589-599), a critical functional domain where recurrent activating ITDs have been established and where no benign population variation is observed in gnomAD. PMID:9737679 documented 47 of 51 FLT3 ITDs in this same codon cluster with constitutive kinase activation.
PM5_Moderate is met per the local FLT3 custom framework extension: this is a novel ITD in the same established activating juxtamembrane hotspot class as prior pathogenic FLT3 ITDs. The exact inserted sequence need not have been previously characterized; the event is clearly an ITD analogue in the same hotspot mechanism as established activating FLT3 mutations.
PS3_Supporting is met because OncoKB reports exact-variant Likely Oncogenic with Likely Gain-of-function for p.(Y597_E598insDLPVTGSSDNEYFYVDFREY), and the broader FLT3 ITD literature (PMID:9737679, PMID:11090077, PMID:11756186) establishes constitutive kinase activation as the canonical mechanism for juxtamembrane ITDs.
PM2_Supporting is met because the variant is absent from gnomAD v2.1 and v4.1 (allele frequency 0.0% in all populations).
The variant is absent from ClinVar and COSMIC. SpliceAI predicts an acceptor gain (delta 0.45), but this is of uncertain clinical significance for an in-frame ITD with an established gain-of-function mechanism.
Applying the local FLT3 ITD / activating length-mutation framework with generic ACMG/AMP 2015 final combination rules: 2 Moderate criteria (PM1, PM5) plus 2 Supporting criteria (PS3, PM2) meets the threshold for Likely Pathogenic (2 Moderate + >=2 Supporting).
No criteria match.
No further detail was recorded.
No further detail was recorded.
Every interpreted variant in FLT3, mapped onto the exon structure of NM_004119.3. Select a row to find it on the plot.
| Protein | Location | Classification | Link |
|---|
Absent from gnomAD v4.1.
Absent from gnomAD v2.1.
SpliceAI predicts possible splice impact for this variant (max delta score = 0.45).
5 paper records listed. No publication is explicitly linked to an applied criterion in the recorded metadata. None of the listed paper records explicitly indicates that the variant is named.
Screenshots represent source records captured during evidence collection. Select one to view the recorded source content.
The evidence statements recorded by the interpretation pipeline. They have not been reinterpreted by the page.
Absent from gnomAD v4.1.
Absent from gnomAD v2.1.
This variant is absent from ClinVar.
SpliceAI predicts possible splice impact for this variant (max delta score = 0.45).
OncoKB identified variant-specific curated literature and context relevant to functional review; biological-effect context: Likely Gain-of-function; curated oncogenicity label: Likely Oncogenic.
This variant does not lie in a statistically significant hotspot. This variant has not previously been reported in somatic cancers (COSMIC).
This variant does not lie in a statistically significant hotspot.