NM_022970.4:c.754_756delTCGinsCTT

Variant names:

• chr10-121520162-CGA-AAG
• NM_022970.4:c.754_756delTCGinsCTT
• FGFR2 p.Ser252Leu

GermlineCancer (beta)

Variant summary

Our verdict is Likely pathogenic.

+6 Likely Pathogenic

-7

-6

-1

0

+5

+6

+9

+10

BenignB

Likely BenignLB

UncertainVUS

Likely PathogenicLP

PathogenicP

The variant received 6 classification points (ACGS-UK Somatic Oncogenicity v2025). O3_ModerateO5_SupportingO7_StrongB2_Supporting

The NM_022970.4(FGFR2):c.754_756delTCGinsCTT (p.Ser252Leu) variant causes a missense change. The gene FGFR2 is a tumor suppressor gene (CancerMine: 5 TSG, 46 oncogene, 36 driver citations). The gene FGFR2 is a known oncogene (CancerMine: 5 TSG, 46 oncogene, 36 driver citations). The gene FGFR2 is a cancer driver gene (CancerMine: 5 TSG, 46 oncogene, 36 driver citations). Note: allele frequency estimates from gnomAD may be inaccurate for this variant type (MNP or indel longer than 3 bp) due to technology limitations. The variant is absent from the gnomAD population database at sites with sufficient sequencing coverage. The affected nucleotide is highly conserved across species (PhyloP 100-way vertebrate score: 9.99). No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. A different missense at the same amino acid position has been reported as Pathogenic/Likely Pathogenic in ClinVar: p.S252F: Likely_pathogenic (ClinVar VariationId 13279, 1 star) Other variants at the same amino acid position have been reported in ClinVar (not pathogenic): p.S252L: Conflicting_classifications_of_pathogenicity (ClinVar VariationId 549484); p.S252= (synonymous): Likely_benign (ClinVar VariationId 1113095, 1 star); p.S252Y: Uncertain_significance (ClinVar VariationId 4724910, 1 star) A different missense variant at the same amino acid position has been reported as oncogenic in ClinVar. The variant position is a cancer hotspot (cancerhotspots.org): 22 samples carry this exact amino acid change out of 66 samples with a variant at this residue. This exact variant is curated in the UniProt human variants database as Uncertain Significance; it is also listed as a COSMIC curated somatic variant.

• Frequency: Genomes: not found (cov: 33)
• Consequence: FGFR2 NM_022970.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.99
• Publications: 0 publications found

Genes affected

FGFR2 (HGNC:3689): (fibroblast growth factor receptor 2) The protein encoded by this gene is a member of the fibroblast growth factor receptor family, where amino acid sequence is highly conserved between members and throughout evolution. FGFR family members differ from one another in their ligand affinities and tissue distribution. A full-length representative protein consists of an extracellular region, composed of three immunoglobulin-like domains, a single hydrophobic membrane-spanning segment and a cytoplasmic tyrosine kinase domain. The extracellular portion of the protein interacts with fibroblast growth factors, setting in motion a cascade of downstream signals, ultimately influencing mitogenesis and differentiation. This particular family member is a high-affinity receptor for acidic, basic and/or keratinocyte growth factor, depending on the isoform. Mutations in this gene are associated with Crouzon syndrome, Pfeiffer syndrome, Craniosynostosis, Apert syndrome, Jackson-Weiss syndrome, Beare-Stevenson cutis gyrata syndrome, Saethre-Chotzen syndrome, and syndromic craniosynostosis. Multiple alternatively spliced transcript variants encoding different isoforms have been noted for this gene. [provided by RefSeq, Jan 2009]

FGFR2 Gene-Disease associations (from GenCC):

• Apert syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, ClinGen, Genomics England PanelApp, G2P, PanelApp Australia
• Beare-Stevenson cutis gyrata syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, ClinGen, Genomics England PanelApp, G2P, PanelApp Australia
• bent bone dysplasia syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, ClinGen, Labcorp Genetics (formerly Invitae), Orphanet
• Crouzon syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: PanelApp Australia, ClinGen, Ambry Genetics, Genomics England PanelApp, G2P, Orphanet
• Jackson-Weiss syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, G2P
• LADD syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• Pfeiffer syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, Ambry Genetics, ClinGen, Genomics England PanelApp, G2P, Labcorp Genetics (formerly Invitae)
• Antley-Bixler syndrome without genital anomalies or disordered steroidogenesis

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp, G2P
• familial scaphocephaly syndrome, McGillivray type

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet
• Saethre-Chotzen syndrome

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• Antley-Bixler syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• LADD syndrome

  Inheritance: AD Classification: SUPPORTIVE, LIMITED Submitted by: Orphanet, ClinGen
• Pfeiffer syndrome type 1

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Pfeiffer syndrome type 2

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Pfeiffer syndrome type 3

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• acinar dysplasia caused by mutation in FGFR2

  Inheritance: AR Classification: LIMITED Submitted by: PanelApp Australia

Classification according to ACGS-UK Somatic Oncogenicity v2025

Classification was made for transcript:

Our verdict: Likely_pathogenic. The variant received 6 points.

Apply	Criterion Code & Title / Strength	Strength	Rationale / Clinical Context
	O3Absent or very rare in population		Absent or extremely rare in gnomAD (AC ≤ 2) — O3 moderate; GnomAD: AF = absent, AC = 0 — absent/extremely rare (O3 moderate [+2])
	O5Same location/impact as known oncogenic		Different AA at same residue with oncogenic evidence (or germline P/LP in TSG), or same AA change SCI Tier II Potential — Supporting (O5); ClinVar same-AA oncogenic/T1: false | ClinVar same-AA SCI tier: — | CGI same-AA oncogenic: false | TSG: true | ClinVar same-AA germline P/LP: false | CIViC LOF: false | ClinVar diff-AA oncogenic: true | ClinVar diff-AA germline P/LP: true
	O7Mutational hotspot or critical domain		Strong hotspot (cancerhotspots.org): >50 total samples, ≥10 same AA change; Note: exclude MSK/TCGA-derived samples from cancerhotspots count to avoid double-counting with O4; cancerhotspots.org: total samples at AA position = 66, same AA change = 22; Exclude MSK/TCGA-derived samples from count to avoid double-counting with O4; UniProt domain: 0 pathogenic, 0 benign.; ±8 AA neighbourhood: 4 pathogenic, 0 benign (OR vs. background: 45.0); Variant does not impact splicing — splice-hotspot path not applicable
	B2Does not fit gene mode of action		Activating variant in tumor suppressor gene + same AA change classified germline Benign/Likely Benign — supporting benign evidence (B2, no cancer-type context); Activating variant in tumor suppressor gene + same AA change classified germline Benign/Likely Benign — supporting benign evidence (B2, no cancer-type context)

Variant Effect in Transcripts

Automated classification analysis was done for transcript: NM_022970.4. You can select a different transcript below to see updated classification assignments.

RefSeq Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	FGFR2 NM_022970.4	MANE Plus Clinical	c.754_756delTCGinsCTT p.Ser252Leu	missense	N/A	Prot: NP_075259.4 UniProt:
	FGFR2 NM_000141.5	MANE Select	c.754_756delTCGinsCTT p.Ser252Leu	missense	N/A	Prot: NP_000132.3 UniProt:
	FGFR2 NM_001441087.1		c.754_756delTCGinsCTT p.Ser252Leu	missense	N/A	Prot: NP_001428016.1 UniProt:

FGFR2 NM_022970.4

MANE Plus Clinical

HGVSc / HGVSpc.754_756delTCGinsCTTp.Ser252Leu

Exon rankN/A

missense

Prot: NP_075259.4UniProt: P21802-3

FGFR2 NM_000141.5

MANE Select

HGVSc / HGVSpc.754_756delTCGinsCTTp.Ser252Leu

Exon rankN/A

missense

Prot: NP_000132.3UniProt: P21802-1

FGFR2 NM_001441087.1

HGVSc / HGVSpc.754_756delTCGinsCTTp.Ser252Leu

Exon rankN/A

missense

Prot: NP_001428016.1UniProt: P21802-18

Ensembl Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	FGFR2 ENST00000457416.7	TSL:1MANE Plus Clinical	c.754_756delTCGinsCTT p.Ser252Leu	missense	N/A	Prot: ENSP00000410294.2 UniProt:
	FGFR2 ENST00000358487.10	TSL:1MANE Select	c.754_756delTCGinsCTT p.Ser252Leu	missense	N/A	Prot: ENSP00000351276.6 UniProt:
	FGFR2 ENST00000369056.5	TSL:1	c.754_756delTCGinsCTT p.Ser252Leu	missense	N/A	Prot: ENSP00000358052.1 UniProt:

FGFR2 ENST00000457416.7

TSL:1MANE Plus Clinical

HGVSc / HGVSpc.754_756delTCGinsCTTp.Ser252Leu

Exon rankN/A

missense

Prot: ENSP00000410294.2UniProt: P21802-3

FGFR2 ENST00000358487.10

TSL:1MANE Select

HGVSc / HGVSpc.754_756delTCGinsCTTp.Ser252Leu

Exon rankN/A

missense

Prot: ENSP00000351276.6UniProt: P21802-1

FGFR2 ENST00000369056.5

TSL:1

HGVSc / HGVSpc.754_756delTCGinsCTTp.Ser252Leu

Exon rankN/A

missense

Prot: ENSP00000358052.1UniProt: P21802-17

Frequencies

Allele frequencies (AF), counts (AC/AN), homozygotes and coverage

Common (AF > 0.05 / Hom > 5)

Rare (AF ≤ 0.0001 / Hom ≤ 1)

Source / population	AF	AC	Hom	AN	Coverage
Global population databases 2 sources Large-scale international reference populations
GnomAD3 genomes	AF:	AC:	Hom:	AN:	Cov:33
GnomAD4 genome	AF:	AC:	Hom:	AN:	Cov:33

Showing 2 sources

ClinVar

Not reported in ClinVar

Computational Scores

Algorithm	Calibrated pred.	Score	Prediction
PhyloP100	Pathogenic	10

Showing 1 of 1 scores

Splicing Scores

No splicing scores have been computed for this variant.

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

MaveDB functional evidence

MaveDB is a public repository of laboratory assays that test the effect of thousands of variants at once — treat this as supporting research data and interpret it with great caution; it is not a clinical classification.

No MaveDB functional evidence found for this variant.

Other links and lift over

hg19: chr10-123279676;

ACMG debug oncogenicity

ACGS debug oncogenicity

ACMG debug germline

Submit to ClinVar