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Beckwith-Wiedemann Syndrome

Beckwith–Wiedemann Syndrome / Beckwith–Wiedemann Spectrum (BWSp): Comprehensive Disease Characteristics Report

2026-06-03
Falcon MONDO:0007534 Model: Edison Scientific Literature 32 citations

Beckwith–Wiedemann Syndrome / Beckwith–Wiedemann Spectrum (BWSp): Comprehensive Disease Characteristics Report

1. Disease Information

Overview (current understanding)

Beckwith–Wiedemann syndrome (BWS; increasingly framed as Beckwith–Wiedemann spectrum, BWSp) is a congenital overgrowth and childhood cancer predisposition condition caused by genetic and/or epigenetic dysregulation of imprinted growth genes on chromosome 11p15.5; many cases are mosaic, contributing to variable phenotype severity (kalish2024updateonsurveillance pages 3-5). The “spectrum” concept (BWSp) is used because heterogeneous molecular causes produce a broad range of presentations from classic BWS to atypical/mild presentations including isolated lateralized overgrowth (eggermann2022molecularbasisof pages 1-2, kalish2024updateonsurveillance pages 3-5).

Key identifiers (availability in retrieved sources)

Synonyms and alternative names

Evidence sources

Most information here is synthesized from aggregated disease-level resources (consensus updates/reviews and cohort studies) rather than individual EHRs, though some included studies are cohorts of clinically evaluated patients (kalish2024updateonsurveillance pages 3-5, maas2016phenotypecancerrisk pages 1-4, tuysuz2023investigationof11p15.5 pages 4-6).

2. Etiology

Disease causal factors (primary causes)

BWSp is an imprinting disorder most often caused by alterations affecting two imprinting domains at 11p15.5: * IC1 (H19/IGF2:IG-DMR), regulating parent-of-origin expression of IGF2 (growth factor) and H19 (noncoding RNA) (maas2016phenotypecancerrisk pages 1-4, eggermann2022molecularbasisof pages 4-5). * IC2 (KCNQ1OT1:TSS-DMR), regulating KCNQ1OT1 (lncRNA) and the growth suppressor/tumor suppressor CDKN1C (papulino2020preclinicalandclinical pages 3-5, eggermann2022molecularbasisof pages 4-5).

Common causal molecular mechanisms and approximate frequencies reported in reviews include: * IC2 loss of methylation (IC2 LOM): ~50% (eggermann2022molecularbasisof pages 4-5, faria2023cdkn1cgeneina pages 37-40) * Paternal uniparental disomy/isodisomy of 11p15 (upd(11)pat / pUPD11): ~20% (eggermann2022molecularbasisof pages 4-5, faria2023cdkn1cgeneina pages 37-40) * IC1 gain of methylation (IC1 GOM): ~5–10% (faria2023cdkn1cgeneina pages 37-40, eggermann2022molecularbasisof pages 4-5) * Maternal CDKN1C pathogenic variants: ~5–10% (higher proportion in familial cases in some series; e.g., 40% of familial cases in one review) (faria2023cdkn1cgeneina pages 37-40, eggermann2022molecularbasisof pages 4-5) * 11p15 copy-number variants (CNVs): ~2.5% (eggermann2022molecularbasisof pages 4-5)

Risk factors

Genetic risk factors

  • Maternal-effect gene variants and multilocus imprinting disturbances (MLID): Reviews highlight that variants in maternal-effect genes (components of the subcortical maternal complex, SCMC; e.g., NLRP2/NLRP5/PADI6) can impair imprint maintenance in early embryos, contributing to MLID in a subset of BWS/BWSp (eggermann2022molecularbasisof pages 4-5).

Environmental/procedural risk factors: Assisted reproductive technologies (ART)

ART is repeatedly discussed as a possible risk factor for imprinting disorders, including BWS/BWSp, plausibly because ART procedures coincide with critical windows of epigenetic reprogramming (sciorio2025associationbetweenhuman pages 13-14, NCT00773825 chunk 1). Quantitative estimates summarized in a recent scoping review include: * Reported ~5.2-fold higher relative risk of BWS in ART-conceived children (95% CI reported in the review as 1.6–7.4) (sciorio2025associationbetweenhuman pages 14-15). * Denmark/Finland registry study summary: OR 3.07 (95% CI 1.49–6.31) for BWS among ART-conceived children (sciorio2025associationbetweenhuman pages 14-15). * Japanese nationwide study summary: 4.46-fold increase in BWS with many cases showing abnormal methylation at imprinted genes (sciorio2025associationbetweenhuman pages 14-15).

Interpretation: these are largely synthesized from earlier-period primary studies (e.g., registry years 1990–2014), and recent reviews emphasize ongoing uncertainty about causality vs confounding by parental infertility (sciorio2025associationbetweenhuman pages 14-15, sciorio2025associationbetweenhuman pages 13-14).

Protective factors

No specific protective genetic variants or environmental protective factors were identified in the retrieved evidence.

Gene–environment interactions

Direct, quantified GxE interactions were not found in the retrieved evidence. Mechanistically, ART is proposed to influence methylation establishment/maintenance at maternally imprinted loci (e.g., IC2) during early development (NCT00773825 chunk 1).

3. Phenotypes

Core phenotype spectrum (clinical)

BWSp is an overgrowth disorder classically described by the triad “exomphalos (omphalocele), macroglossia, and gigantism/macrosomia” (faria2023cdkn1cgeneina pages 32-34). Common/characteristic features include macroglossia, abdominal wall defects, lateralized overgrowth (hemihyperplasia), neonatal hypoglycemia/hyperinsulinism, ear pits/creases, and organomegaly; BWSp also increases risk of embryonal tumors (maas2016phenotypecancerrisk pages 1-4, maas2016phenotypecancerrisk pages 30-31).

Frequency examples (recent cohort; LO-enriched): In a 2023 cohort of 87 children with lateralized overgrowth (LO), reported features included macroglossia 29.8%, ear crease/pit 19.5%, umbilical hernia/diastasis recti 16%, organomegaly 14.9%, transient neonatal hypoglycemia 12.9%, facial nevus simplex 9.1%, and omphalocele 8% (tuysuz2023investigationof11p15.5 pages 4-6).

High-frequency feature (BWSp overall): Macroglossia is reported as a cardinal feature observed in ~90% of BWSp patients in a review synthesis (eggermann2022molecularbasisof pages 4-5).

Tumor predisposition phenotype

Key tumors include Wilms tumor (WT) and hepatoblastoma (HB), and less commonly neuroblastoma and other embryonal tumors; risks vary by molecular subtype (kalish2024updateonsurveillance pages 3-5, eggermann2022molecularbasisof pages 4-5).

Suggested HPO terms (examples)

(These HPO IDs are standard ontology identifiers; they were not enumerated in the retrieved articles, though HPO is cited as a harmonized phenotyping resource in BWSp literature.) (faria2023cdkn1cgenein pages 34-37)

Quality-of-life impact

Specific validated QoL instrument data (e.g., EQ-5D/SF-36) were not present in the retrieved excerpts. However, the phenotype can drive functional morbidity (feeding/speech impairment from macroglossia; surgical needs for abdominal wall defects; anxiety and burden associated with intensive tumor surveillance) (kalish2024updateonsurveillance pages 10-12, klein2023occurrenceofhepatoblastomas pages 1-2).

4. Genetic / Molecular Information

Causal genes and loci (core)

Imprinted region 11p15.5 is central, with two control regions: * IC1 (H19/IGF2:IG-DMR) affecting IGF2 and H19 (eggermann2022molecularbasisof pages 4-5, maas2016phenotypecancerrisk pages 1-4) * IC2 (KCNQ1OT1:TSS-DMR) affecting KCNQ1OT1, KCNQ1, and CDKN1C (papulino2020preclinicalandclinical pages 3-5, eggermann2022molecularbasisof pages 4-5)

CDKN1C pathogenic variants are a recognized heritable cause (maternal allele effect) (eggermann2022molecularbasisof pages 4-5).

Pathogenic variant / lesion classes

Somatic vs germline and mosaicism

BWSp frequently shows somatic mosaicism; a blood-based molecular subtype may not represent affected tissue or tumor subtype, complicating genotype–phenotype correlation and tumor-risk estimation (kalish2024updateonsurveillance pages 3-5, klein2023occurrenceofhepatoblastomas pages 1-2).

Modifier genes / MLID mechanisms (current research direction)

MLID can result from trans-acting imprint maintenance factors (e.g., ZFP57) or maternal-effect SCMC genes (NLRP2/NLRP5/PADI6), highlighting an emerging axis of maternal genetic contribution to imprinting errors (eggermann2022molecularbasisof pages 4-5, NCT06346418 chunk 1).

5. Environmental Information

Environmental/lifestyle factors

No specific toxin/lifestyle exposures were identified in retrieved evidence.

ART as a non-genetic contributing factor

ART is the primary non-genetic/procedural factor discussed for BWSp risk, with proposed mechanisms involving disruption of imprint establishment/maintenance during early embryogenesis (sciorio2025associationbetweenhuman pages 13-14, NCT00773825 chunk 1).

6. Mechanism / Pathophysiology

Causal chain (imprinting → gene expression → growth/tumors)

  1. Initial trigger: epigenetic alteration (IC1 GOM, IC2 LOM), UPD, or CNV at 11p15.5 (eggermann2022molecularbasisof pages 4-5).
  2. Primary molecular consequence: parent-of-origin expression patterns are altered:
  3. IC1 GOM / pUPD11 → IGF2 overexpression and reduced H19 (eggermann2022molecularbasisof pages 4-5, nirgude2024cancerpredispositionsignaling pages 1-2).
  4. IC2 LOM → KCNQ1OT1 transcription with reduced CDKN1C expression (loss of a growth brake) (papulino2020preclinicalandclinical pages 3-5, nirgude2024cancerpredispositionsignaling pages 1-2).
  5. Cellular phenotype: increased proliferation and altered differentiation; BWSp reviews propose tumor formation may relate to “stalled cellular differentiation” in organs, predisposing embryonic cells to accumulate additional defects (eggermann2022molecularbasisof pages 4-5).
  6. Clinical phenotype: prenatal/neonatal overgrowth, macroglossia, abdominal wall defects, lateralized overgrowth, and increased risk of embryonal tumors (maas2016phenotypecancerrisk pages 1-4, eggermann2022molecularbasisof pages 4-5).

Tumor biology (recent developments, 2023–2024 priority)

  • Wilms tumor in BWSp: Multi-omics analysis of BWS-WT reported CTNNB1 (β-catenin) overexpression with a broad interactome and identified differential methylation/gene expression signatures stratified by 11p15 status; typical recurrent sporadic WT driver mutations were less prominent, suggesting a distinct signaling context in BWS-WT (publication online Dec 2023; journal issue 2024) (nirgude2024cancerpredispositionsignaling pages 1-2).
  • Hepatoblastoma in BWSp: In the largest compiled BWS–HB cohort (16 new cases + literature total 50), 100% of HB tumors tested by targeted panels had CTNNB1 variants, implicating Wnt/β-catenin signaling as a common cooperating pathway; the study also demonstrated epigenotype mosaicism across blood, normal liver, and HB tissue, affecting risk attribution and supporting universal screening (Apr 2023) (klein2023occurrenceofhepatoblastomas pages 1-2).

Suggested GO terms (biological processes; examples)

Suggested Cell Ontology (CL) terms (cell types; examples)

  • Nephron progenitor cell (relevant to Wilms tumor developmental context)
  • Hepatoblast (relevant to hepatoblastoma)

(These CL terms are standard ontology concepts; explicit CL IDs were not provided in retrieved excerpts.)

7. Anatomical Structures Affected

Organ level (primary)

Tissue/cell level

Suggested UBERON terms (examples)

(UBERON IDs are standard anatomy ontology identifiers; not provided explicitly in retrieved articles.)

8. Temporal Development

Onset

BWSp is typically congenital and often recognized in infancy/early childhood, though presentation can vary with mosaicism (faria2023cdkn1cgeneina pages 32-34).

Tumor risk window (quantitative)

9. Inheritance and Population

Inheritance pattern (molecularly heterogeneous)

BWSp is often sporadic, but heritable cases occur, particularly with maternal CDKN1C pathogenic variants and some structural rearrangements; parental origin is crucial due to imprinting (eggermann2022molecularbasisof pages 4-5).

Epidemiology (statistics available in retrieved evidence)

Sex ratio / geography

Not extractable from retrieved evidence in this run.

10. Diagnostics

Clinical criteria and scoring (real-world implementation)

A consensus-based BWSp clinical scoring system assigns 2 points to cardinal features and 1 point to suggestive features. A clinical diagnosis is typically made at ≥4 points, and molecular testing is recommended for ≥2 points (faria2023cdkn1cgenein pages 34-37, papulino2020preclinicalandclinical pages 5-7).

Molecular testing approach (current practice)

Because most BWSp etiologies are methylation/CNV changes at 11p15.5, recommended testing is typically: 1. Methylation + CNV assessment at IC1/IC2 using MS-MLPA (widely used because it captures methylation and copy number simultaneously) (papulino2020preclinicalandclinical pages 5-7, brzezinski2019integratedgeneticand pages 70-74). 2. UPD assessment via STR/microsatellite analysis and/or SNP array (SNP array can detect pUPD and CNVs and does not always require parental samples) (brzezinski2019integratedgeneticand pages 70-74). 3. CDKN1C sequencing (especially in familial cases, or when phenotype suggests CDKN1C) (faria2023cdkn1cgeneina pages 76-79, papulino2020preclinicalandclinical pages 5-7). 4. If blood testing is negative but clinical suspicion remains, expand to multi-tissue testing (buccal swab, skin from affected regions, fibroblasts/mesenchymal-derived tissue) to detect mosaicism (papulino2020preclinicalandclinical pages 5-7, tuysuz2023investigationof11p15.5 pages 4-6).

Differential diagnosis (limited in retrieved evidence)

The retrieved excerpts emphasize that when blood methylation is negative, expanded testing (CDKN1C sequencing, CMA, exome/genome) and evaluation for other overgrowth syndromes should be considered (russo2025beckwithwiedemannspectrum(bwsp) pages 2-5).

11. Outcome / Prognosis

Tumor-related morbidity and mortality (evidence available)

BWSp confers substantial early childhood tumor risk (overall ~8–12% cited in surveillance review; subtype-dependent), motivating intensive screening in early childhood (kalish2024updateonsurveillance pages 3-5). The most critical prognostic window is early childhood: WT/HB risk is concentrated before age 7/3 years respectively, and tumor surveillance aims to detect tumors earlier (kalish2024updateonsurveillance pages 10-12).

Quality of life / long-term outcomes

Specific long-term QoL metrics were not present in the retrieved excerpts; outcome focus in available evidence is on early tumor detection via screening and management of congenital features (kalish2024updateonsurveillance pages 10-12).

12. Treatment

Current clinical management (applications/implementations)

No disease-modifying pharmacotherapy for imprinting defects is established in the retrieved evidence. Real-world care is dominated by: * Surgical and supportive care for congenital anomalies (e.g., macroglossia reduction procedures) and metabolic issues (hyperinsulinism/hypoglycemia) (klein2023occurrenceofhepatoblastomas pages 1-2). * Cancer surveillance and standard pediatric oncology therapy when tumors occur.

Tumor surveillance as an actionable “intervention”

The 2024 AACR Pediatric Cancer Working Group update proposes a harmonized surveillance strategy for syndromes with WT/HB risk >1%: * WT screening: renal ultrasound every 3 months from birth/diagnosis to age 7 years (kalish2024updateonsurveillance pages 10-12). * HB screening (for BWSp and selected syndromes): AFP + complete abdominal ultrasound every 3 months until age 3 years (36 months); note that AFP norms for BWSp have been developed and interpretation should consider trend and BWSp-specific elevation (kalish2024updateonsurveillance pages 10-12).

(Visual evidence of these schedules is captured in the cropped guideline images) (kalish2024updateonsurveillance media 50e671f4, kalish2024updateonsurveillance media 6165189a, kalish2024updateonsurveillance media b2fd0c4d).

Suggested MAXO terms (examples)

  • Abdominal ultrasound screening — MAXO: imaging procedure / ultrasonography (ontology label depends on MAXO version)
  • Serum alpha-fetoprotein measurement — MAXO: laboratory test
  • Genetic testing (methylation analysis, SNP array, sequencing) — MAXO: genetic test

(MAXO IDs not provided in retrieved evidence; suggested at concept level.)

13. Prevention

Primary prevention

No established primary prevention for sporadic imprinting errors is supported by the retrieved evidence.

Secondary prevention (screening/early detection) — key real-world implementation

Cancer surveillance (renal/abdominal ultrasound and AFP monitoring) is the major secondary prevention strategy to reduce morbidity by earlier detection of WT and HB during the high-risk window (kalish2024updateonsurveillance pages 10-12, kalish2024updateonsurveillance media 50e671f4).

Genetic counseling

Counseling is critical because recurrence risk depends on mechanism (e.g., CDKN1C variants and some rearrangements can be familial), and cascade testing is appropriate when a heritable mechanism is identified (kalish2024updateonsurveillance pages 12-14).

14. Other Species / Natural Disease

Natural disease analogs were not identified in the retrieved evidence. However, ART-associated imprinting disruption is discussed with reference to animal “large offspring syndrome” analogies at imprinting loci in reviews (sciorio2025associationbetweenhuman pages 13-14).

15. Model Organisms

Recent, explicit model-organism usage appears in a recruiting clinical research protocol that includes mouse Padi6 mut/mut experiments with single-cell bisulfite sequencing and single-cell RNA-seq to study imprint maintenance and maternal-effect contributions relevant to BWS risk (NCT06346418) (NCT06346418 chunk 1).

Recent Developments and Latest Research (2023–2024 priority highlights)

  1. Updated surveillance guidance (Sep 2024): AACR working group updated WT/HB surveillance with specific imaging and AFP schedules and emphasized uniform screening for syndromes exceeding a 1% risk threshold; BWSp is a central example (URL: https://doi.org/10.1158/1078-0432.CCR-24-2100; publication date Sep 2024) (kalish2024updateonsurveillance pages 10-12, kalish2024updateonsurveillance pages 3-5).
  2. BWSp–Wilms tumor signaling (online Dec 2023; issue 2024): Multi-omic profiling of BWS-associated WT showed CTNNB1 overexpression and distinct methylation/expression signatures stratified by 11p15 status, supporting Wnt/β-catenin as a cooperating pathway and highlighting potential therapeutic target discovery (URL: https://doi.org/10.1038/s41416-023-02538-x; published online 23 Dec 2023) (nirgude2024cancerpredispositionsignaling pages 1-2).
  3. BWSp–hepatoblastoma genetics (Apr 2023): Largest compiled BWS–HB cohort reported CTNNB1 variants in 100% of tested HBs and demonstrated organ-specific epigenotype mosaicism, supporting universal screening because blood profiling may not represent organ risk (URL: https://doi.org/10.3390/cancers15092548; publication date 29 Apr 2023) (klein2023occurrenceofhepatoblastomas pages 1-2).

Expert opinions / authoritative analysis (from retrieved sources)

Clinical trials and ongoing research (real-world implementations)

  • NCT06346418 (Recruiting; posted 2023): “Maternal Genes and Epimutations: Beckwith-Wiedemann Syndrome & Reproductive Risks.” Uses WES/SNP-array/WGS and methylome profiling in mothers of BWS children and women undergoing ART/RPL, with complementary mouse-model experiments. URL: https://clinicaltrials.gov/study/NCT06346418 (NCT06346418 chunk 1, NCT06346418 chunk 2).
  • NCT01842659 (Status listed as unknown/active not recruiting): Prenatal screening for imprinting anomalies in BWS/SRS using a qPCR-based methylation index from amniocytes with concordance to cord blood/placenta. URL: https://clinicaltrials.gov/study/NCT01842659 (NCT01842659 chunk 1).
  • NCT05214742 (Enrolling by invitation; posted 2022): iPSC generation from blood to model imprinting disorders (including BWS) and study consequences of epimutations on imprinted gene networks. URL: https://clinicaltrials.gov/study/NCT05214742 (NCT05214742 chunk 1).
  • NCT00773825 (Completed; posted 2007): EPIGEN—ART and imprinting defects; methylation assessment at 9 imprinted loci in cord blood/placenta. URL: https://clinicaltrials.gov/study/NCT00773825 (NCT00773825 chunk 1).

Structured summary table (molecular subtype → tumor risk → surveillance)

Table (click to expand)
Molecular subtype / lesion Mechanism / genes affected Approx. frequency among BWSp Tumor risk estimates Mosaicism / tissue-testing implications Surveillance implications
IC1 gain of methylation (IC1 GOM; H19/IGF2:IG-DMR hypermethylation) Increased methylation at telomeric imprinting control region 1 causes increased paternal-like IGF2 expression and reduced H19; growth-promoting state strongly linked to Wilms tumor predisposition (eggermann2022molecularbasisof pages 4-5, nirgude2024cancerpredispositionsignaling pages 1-2) ~5% (eggermann2022molecularbasisof pages 4-5) Highest subgroup risk: overall tumor risk 28.1% / 28%; Wilms tumor 24%; neuroblastoma 0.7%; pancreatoblastoma 0.7% (eggermann2022molecularbasisof pages 4-5, maas2016phenotypecancerrisk pages 1-4) BWSp is often mosaic; blood epitype may not match kidney/tumor tissue. Some WT have isolated IC1 GOM without broader LOH, so negative blood testing does not fully exclude tissue-restricted disease (kalish2024updateonsurveillance pages 3-5, nirgude2024cancerpredispositionsignaling pages 1-2) Exceeds AACR 1% threshold. Current practice update supports renal ultrasound every 3 months from birth/diagnosis to age 7 years; because BWSp also carries HB risk overall, many programs use complete abdominal ultrasound every 3 months until age 3 years, then renal ultrasound to age 7 (kalish2024updateonsurveillance pages 3-5, kalish2024updateonsurveillance pages 10-12, kalish2024updateonsurveillance pages 1-3)
IC2 loss of methylation (IC2 LOM; KCNQ1OT1:TSS-DMR hypomethylation) Maternal IC2 hypomethylation permits biallelic KCNQ1OT1 expression and reduced CDKN1C expression; associated with reduced growth suppression and classic BWSp features such as macroglossia/midline defects (papulino2020preclinicalandclinical pages 3-5, eggermann2022molecularbasisof pages 4-5) ~50% (eggermann2022molecularbasisof pages 4-5) Lower-risk subgroup: overall tumor risk 2.6%; hepatoblastoma 0.7%; rhabdomyosarcoma 0.5%; neuroblastoma 0.5%; thyroid cancer 0.3%; Wilms tumor 0.2%; melanoma 0.1%. Pooled cohort also showed hepatoblastoma in IC2 subgroup and very low WT risk (eggermann2022molecularbasisof pages 4-5, maas2016phenotypecancerrisk pages 1-4) Blood testing can miss mosaic 11p15 defects; additional tissues (buccal swab, skin/affected tissue) may be informative in clinically suspected but blood-negative cases. Tissue discordance is a known limitation for genotype–phenotype and risk assignment (papulino2020preclinicalandclinical pages 5-7, russo2025beckwithwiedemannspectrum(bwsp) pages 2-5, kalish2024updateonsurveillance pages 3-5) Still exceeds the 1% threshold overall. Kalish 2024 notes IC2-LOM has lower overall risk (~2–3%), with many reported tumors being HB. Updated North American/Australian approach generally supports BWSp tumor surveillance, including AFP + complete abdominal ultrasound every 3 months until age 3 years, then renal ultrasound every 3 months until age 7 years (kalish2024updateonsurveillance pages 3-5, kalish2024updateonsurveillance pages 10-12)
Paternal uniparental disomy of 11p15 / pUPD11 (upd(11)pat) Paternalization of both imprinting domains causes IGF2 overexpression with silencing/reduction of H19 and CDKN1C; often reflects mosaic LOH/pUPD affecting 11p15 and can extend into tumor tissue (eggermann2022molecularbasisof pages 4-5, nirgude2024cancerpredispositionsignaling pages 1-2) ~20% (eggermann2022molecularbasisof pages 4-5) Intermediate-high risk: overall tumor risk 16% (Kalish summary also 16–30%); Wilms tumor 7.9%; hepatoblastoma 3.5%; neuroblastoma 1.4%; adrenocortical carcinoma 1.1%; pheochromocytoma 0.8%; lymphoblastic leukemia 0.5%; pancreatoblastoma 0.3%; hemangiotheloma 0.3% (eggermann2022molecularbasisof pages 4-5, kalish2024updateonsurveillance pages 3-5) Strongly affected by mosaicism; blood epigenotype may differ from liver, kidney, or tumor. Organ-specific mosaicism is a major reason blood-based profiling can underestimate risk; SNP array/STR testing and multi-tissue sampling may be needed (brzezinski2019integratedgeneticand pages 70-74, klein2023occurrenceofhepatoblastomas pages 1-2, kalish2024updateonsurveillance pages 3-5) Clearly above 1% threshold. Because both WT and HB risks are material, surveillance should include complete abdominal ultrasound every 3 months until age 3 years plus AFP every 3 months until age 3 years, followed by renal ultrasound every 3 months until age 7 years; adrenal glands should also be imaged given slightly increased adrenal tumor risk in BWSp, especially pUPD11 (kalish2024updateonsurveillance pages 10-12, kalish2024updateonsurveillance pages 3-5)
Maternal CDKN1C pathogenic variant Loss-of-function of maternally expressed CDKN1C (cell-cycle inhibitor/tumor suppressor); paternal allele is normally silenced, so pathogenicity is dependent on maternal transmission/expression (eggermann2022molecularbasisof pages 4-5) ~5% of sporadic cases; up to 40% of familial cases (older reviews also cite ~5–10% overall) (eggermann2022molecularbasisof pages 4-5, faria2023cdkn1cgeneina pages 37-40) Overall malignancy risk is lower than IC1/pUPD groups; pooled data identified neuroblastoma ~2.8% in the CDKN1C subgroup, with no clear WT/HB excess in the datasets summarized by Kalish 2024 (maas2016phenotypecancerrisk pages 1-4, kalish2024updateonsurveillance pages 3-5) Not a methylation defect per se, but BWSp diagnostic workup must still consider mosaicism and blended etiologies; sequencing of CDKN1C is especially important in familial cases or when cleft palate/omphalocele/family history is present (faria2023cdkn1cgeneina pages 76-79, papulino2020preclinicalandclinical pages 5-7) Kalish 2024 specifically notes screen all BWSp patients except those with CDKN1C pathogenic variants for WT/HB under their harmonized recommendation, reflecting the low WT/HB burden in this subgroup; counseling and phenotype-directed follow-up remain important (kalish2024updateonsurveillance pages 3-5)
11p15 copy-number variants / chromosomal rearrangements Duplications/deletions/translocations involving IC1/IC2 and nearby imprinted genes can alter dosage/imprinting; many paternal duplications increase expression of paternally expressed growth genes, while phenotype depends on size, content, and parental origin (eggermann2022molecularbasisof pages 4-5, papulino2020preclinicalandclinical pages 5-7) ~2.5% for CNVs; chromosomal rearrangements are rare (<5% overall in some series) (eggermann2022molecularbasisof pages 4-5) Quantitative subgroup-specific tumor percentages are less well established than for IC1/IC2/pUPD. Risk is generally considered within BWSp and may warrant caution when the lesion creates a paternalized 11p15 state (eggermann2022molecularbasisof pages 4-5, papulino2020preclinicalandclinical pages 5-7) CNVs may be missed if only methylation is assessed; recommended workup includes MS-MLPA for methylation + copy number, with chromosomal microarray, karyotype, or FISH to define breakpoints/rearrangements. Multi-tissue testing may still be needed if mosaic (papulino2020preclinicalandclinical pages 5-7, brzezinski2019integratedgeneticand pages 70-74) If the lesion confers BWSp with estimated tumor risk above 1%, AACR-style surveillance principles apply. In practice, many clinically diagnosed BWSp patients undergo the same US/AFP surveillance schedule because precise blood-defined subgroup assignment may be unreliable in mosaic disease (kalish2024updateonsurveillance pages 1-3, kalish2024updateonsurveillance pages 3-5, klein2023occurrenceofhepatoblastomas pages 1-2)
No detectable molecular defect / clinically diagnosed BWSp No confirmed 11p15 lesion in tested sample despite clinical phenotype; may reflect low-level mosaicism, tissue-restricted epigenetic change, alternative diagnosis, or currently unsolved mechanism (russo2025beckwithwiedemannspectrum(bwsp) pages 2-5, kalish2024updateonsurveillance pages 3-5) ~20% remain unsolved after standard testing (russo2025beckwithwiedemannspectrum(bwsp) pages 2-5) Pooled cohort estimate from Maas: ~6.7% tumor risk in patients without a detectable molecular defect (maas2016phenotypecancerrisk pages 1-4) Negative blood testing does not exclude BWSp. Additional tissues from affected sites can improve yield; blood/tumor discordance and organ-specific mosaicism are well documented (russo2025beckwithwiedemannspectrum(bwsp) pages 2-5, kalish2024updateonsurveillance pages 3-5, klein2023occurrenceofhepatoblastomas pages 1-2) Because estimated risk remains above 1% and subgroup assignment may be falsely negative in blood, recent guidance favors universal BWSp surveillance in most patients: complete abdominal ultrasound + AFP every 3 months to age 3 years, then renal ultrasound every 3 months to age 7 years (except CDKN1C subgroup in the Kalish 2024 approach) (kalish2024updateonsurveillance pages 3-5, kalish2024updateonsurveillance pages 10-12, klein2023occurrenceofhepatoblastomas pages 1-2)

Table: This table summarizes the major 11p15.5 molecular subtypes of Beckwith–Wiedemann spectrum, their core mechanisms, approximate frequencies, tumor risks, and surveillance implications. It is useful for linking subtype-specific biology to real-world testing and screening decisions.

Direct abstract quotes (available from retrieved abstracts)

  • Tüysüz et al., 2023 (Cancers): “The Beckwith–Wiedemann spectrum (BWSp) ranges from isolated lateralized overgrowth (ILO) to classic phenotypes… an epigenetic alteration on chromosome 11p15.5 can be detected. The risk for embryonal tumors is high, especially in patients with lateralized overgrowth (LO).” (URL: https://doi.org/10.3390/cancers15061872; publication date Mar 2023) (tuysuz2023investigationof11p15.5 pages 1-2).
  • Klein et al., 2023 (Cancers): “Patients with Beckwith–Wiedemann syndrome (BWS), an epigenetic imprinting disorder involving alterations in genes at the 11p15 chromosomal location, are predisposed to develop hepatoblastomas (HBs)…” and “we found that 100% of the HBs… had variants in the CTNNB1 gene… epigenotype mosaicism… Therefore, universal screening is recommended for all patients with BWS.” (URL: https://doi.org/10.3390/cancers15092548; publication date 29 Apr 2023) (klein2023occurrenceofhepatoblastomas pages 1-2).
  • Kalish et al., 2024 (Clin Cancer Res): “Guidelines for surveillance in this population were published in 2017 and recently members of the AACR Pediatric Cancer Working Group met to update those guidelines with a review of more recently published evidence and risk estimates…” (URL: https://doi.org/10.1158/1078-0432.CCR-24-2100; publication date Sep 2024) (kalish2024updateonsurveillance pages 3-5).

Data gaps and limitations in this run

  • Standardized cross-ontology IDs (MONDO, MeSH, Orphanet, ICD-10/11) were not present in the retrieved full-text excerpts; extracting them would require additional direct queries to OMIM/Orphanet/MONDO resources beyond the documents available here.
  • Detailed QoL metrics, long-term survival statistics, and treatment response rates specific to BWSp were not present in the retrieved excerpts.

References

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