Is EGFR p.Ser306= (c.918G>C) pathogenic?

EGFR p.Ser306= (c.918G>C) is classified Likely benign in EGFR (ClinVar, Multiple submitters, 2 submitters; last evaluated 2026-06-08). Very rare (popmax 6.2e-05%); Associated with hereditary neoplastic syndrome.

What condition is associated with EGFR p.Ser306= (c.918G>C)?

EGFR p.Ser306= (c.918G>C) is associated with hereditary neoplastic syndrome (ClinVar).

How common is EGFR p.Ser306= (c.918G>C) in the general population?

EGFR p.Ser306= (c.918G>C) is very rare (popmax 6.2e-05%) (gnomAD).

EGFR p.Ser306=

c.918G>C · rs202182545 · VCV1113958

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 6.2e-05%)

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -9	GERP -4.1
Overall
CADD	0.145	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 6.2e-05%

Overall 6.2e-05% 1/1,613,058 alleles · very rare exomes 1/1,460,866 · genomes 0/152,192 · joint denominator

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: EGFR
Protein: p.Ser306=
Coding: c.918G>C
MANE Select: NM_005228
dbSNP: rs202182545
Type: single nucleotide variant
Location: chr7:55155858 (GRCh38)
Gene constraint: LOEUF 0.475 · pLI 0.98 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 76.29 · 393 PDB
Residue 306: a β-strand

Full EGFR gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary neoplastic syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

EGFR p.Ser306Leu Uncertain significance ★★ same residue
EGFR c.1207+5G>A Uncertain significance ★★ same condition
EGFR c.1298+3A>G Uncertain significance ★★ same condition
EGFR c.1298+4A>G Uncertain significance ★★ same condition
EGFR c.1298+6T>C Uncertain significance ★★ same condition
EGFR c.1499-3C>T Uncertain significance ★★ same condition
EGFR c.1499-4G>T Uncertain significance ★★ same condition
EGFR c.1920-3C>T Uncertain significance ★★ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/egfr-p-ser306 (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown