Neurofibromatosis Type 1

1. Disease Information

2026-04-25
Falcon MONDO:0018975 Model: Edison Scientific Literature 51 citations

1. Disease Information

1.1 Concise overview (current understanding)

NF1 is a common autosomal dominant, multisystem genetic condition caused by germline pathogenic variants in NF1, encoding neurofibromin, a negative regulator of Ras signaling (a Ras-GAP). Loss of neurofibromin drives hyperactive Ras pathway output and predisposes to benign peripheral nerve sheath tumors (cutaneous and plexiform neurofibromas) and malignant tumors (e.g., malignant peripheral nerve sheath tumor), as well as neurodevelopmental and skeletal manifestations. (peduto2023neurofibromatosistype1 pages 1-2, park2024recentadvancesin pages 1-2, na2024pastpresentand pages 1-3)

NF1 shows complete penetrance with marked inter- and intrafamilial variable expressivity and age-dependent emergence of manifestations, complicating early diagnosis in children. (peduto2023neurofibromatosistype1 pages 1-2)

1.2 Key identifiers and controlled vocabularies

A compact identifier/synonym table is provided below.

Table (click to expand)
Disease name Common abbreviation MONDO ID OMIM/MIM number(s) reported in available evidence Inheritance Common synonyms / alternative names Key distinguishing related condition Key references (year; URL)
Neurofibromatosis type 1 NF1 MONDO:0018975 OMIM/MIM 162200 reported in 2023 review/meta-analysis; one 2021 consensus excerpt reports “OMIM 613113,” but this appears inconsistent with the standard disease OMIM usage and should be cross-checked before knowledge-base normalization Autosomal dominant Neurofibromatosis 1; Neurofibromatosis type I; von Recklinghausen disease / von Recklinghausen neurofibromatosis Legius syndrome (LGSS), caused by heterozygous pathogenic SPRED1 variants; may overlap with NF1 pigmentary findings in young children, but LGSS does not carry NF1-related tumor risks; molecular testing of NF1 and SPRED1 is recommended when presentation is limited to pigmentary findings Legius et al. 2021, Genetics in Medicine, https://doi.org/10.1038/s41436-021-01170-5; Peduto et al. 2023, Cancers, https://doi.org/10.3390/cancers15041217; Lee et al. 2023, Orphanet Journal of Rare Diseases, https://doi.org/10.1186/s13023-023-02911-2; Park 2024, Journal of Genetic Medicine, https://doi.org/10.5734/jgm.2024.21.2.51 (peduto2023neurofibromatosistype1 pages 1-2, legius2021reviseddiagnosticcriteria pages 1-2, peduto2023neurofibromatosistype1 pages 2-4, lee2023incidenceandprevalence pages 1-2, park2024recentadvancesin pages 1-2)

Table: This table summarizes key disease identifiers, inheritance, synonyms, and the most important related differential condition for Neurofibromatosis type 1. It is useful for knowledge-base normalization and for distinguishing NF1 from Legius syndrome in early or pigment-only presentations.

Important gap: ICD-10/ICD-11 codes, MeSH IDs, and Orphanet IDs were not present in the retrieved evidence corpus used by the tools in this run; therefore, they are not asserted here. The MONDO ID above is directly supported, and an OMIM/MIM number for the disease (162200) is supported by the 2023 prevalence/incidence meta-analysis. (lee2023incidenceandprevalence pages 1-2)

1.3 Synonyms and alternative names

Commonly used names include “neurofibromatosis 1” and “neurofibromatosis type I.” (park2024recentadvancesin pages 1-2, lee2023incidenceandprevalence pages 1-2)


2. Etiology

2.1 Disease causal factors

2.2 Risk factors

2.3 Protective factors

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

2.4 Gene–environment interactions

The retrieved sources do not provide a clear gene–environment interaction model beyond the general observation that radiation exposure can increase risk for MPNST, especially in the context of NF1 tumor predisposition. (yao2023malignantperipheralnerve pages 2-4)


3. Phenotypes

3.1 Core clinical phenotype spectrum and frequencies (examples)

Key frequencies/statistics extracted from recent sources are summarized here and in a table artifact.

Table (click to expand)
Source Metric Value Notes
Lee 2023 Pooled prevalence of NF1 3.16 per 10,000 (95% CI 2.12–4.69); ~1 in 3,164 Meta-analysis of 9 studies, 3,045 cases, pooled population 11,649,059; high heterogeneity (I²=99%) (lee2023incidenceandprevalence pages 2-4, lee2023incidenceandprevalence pages 1-2)
Lee 2023 Pooled birth incidence of NF1 3.76 per 10,000 live births (95% CI 2.78–5.08); ~1 in 2,662 Meta-analysis of 3 studies; 423 cases in 1,170,928 births (lee2023incidenceandprevalence pages 2-4, lee2023incidenceandprevalence pages 1-2)
Lee 2023 Prevalence in screening studies 4.95 per 10,000 (95% CI 2.47–9.92); ~1 in 2,020 Higher than record-based estimates, supporting under-recognition in routine data (lee2023incidenceandprevalence pages 2-4, lee2023incidenceandprevalence pages 1-2)
Lee 2023 Prevalence in medical-record studies 2.31 per 10,000 (95% CI 2.13–2.50); ~1 in 4,329 Lower ascertainment than screening studies (lee2023incidenceandprevalence pages 2-4, lee2023incidenceandprevalence pages 1-2)
Lee 2023 Sensitivity-analysis estimate (birth incidence + child/adolescent screening) ~1 in 2,265 (95% CI 1 in 1,497 to 1 in 3,428) Suggests higher occurrence when age-appropriate screening is considered (lee2023incidenceandprevalence pages 4-7)
Carton 2023 Birth incidence (guideline background) 1 in 2,000–2,500 Guideline background estimate; consistent with broader epidemiology (carton2023erngenturistumour pages 1-2)
Carton 2023 Lifetime cancer risk in NF1 59.6% Compared with 30.8% in the general population (carton2023erngenturistumour pages 1-2)
Carton 2023 Lifetime cancer risk in general population 30.8% Comparator for NF1-associated cancer burden (carton2023erngenturistumour pages 1-2)
Carton 2023 Plexiform neurofibroma (PN) frequency ~40–60% PN associated with risk of malignant transformation (carton2023erngenturistumour pages 10-12)
Suppiah 2023 Plexiform intraneural neurofibroma frequency ~30–50% Independent molecular profiling paper; similar range to guideline estimates (suppiah2023multiplatformmolecularprofiling pages 1-2)
Carton 2023 Cutaneous neurofibroma frequency >95% Common benign tumor manifestation in NF1 (carton2023erngenturistumour pages 10-12)
Carton 2023 MPNST lifetime risk 8–16% Typical presentation between ages 20–40 years (carton2023erngenturistumour pages 10-12)
Suppiah 2023 Lifetime risk of malignant transformation from PN to MPNST 5–15% Reported for plexiform intraneural neurofibromas (suppiah2023multiplatformmolecularprofiling pages 1-2)
Carton 2023 OPGs requiring treatment 15–20% of patients with OPG Many OPGs are observed; treatment reserved for progressive/symptomatic disease (carton2023erngenturistumour pages 9-10)
Carton 2023 Non-optic pathway glioma frequency Approximately 4–5% of individuals with NF1 Refers to non-OPG brain gliomas (carton2023erngenturistumour pages 9-10)
Peduto 2023 Cognitive/behavioral disorders in children with NF1 Up to 80% Broad neurodevelopmental burden reported in recent review (park2024recentadvancesin pages 1-2)
Peduto 2023 Café-au-lait macules in infants with NF1 >95% Early childhood clinical feature; useful for pediatric recognition (peduto2023neurofibromatosistype1 pages 1-2)
Peduto 2023 Cutaneous neurofibromas in affected adults About 90% Age-dependent increase in tumor burden (peduto2023neurofibromatosistype1 pages 1-2)
Peduto 2023 Lisch nodules in children <5 years <50% Highlights age-dependent penetrance of diagnostic features (peduto2023neurofibromatosistype1 pages 1-2)
Peduto 2023 Lisch nodules in adults Almost all adults Age-dependent diagnostic feature (peduto2023neurofibromatosistype1 pages 1-2)
Peduto 2023 Choroidal abnormalities in children 60–70% Common ocular sign in pediatric NF1 (peduto2023neurofibromatosistype1 pages 2-4)
Peduto 2023 Anemic nevus in children Up to 50% Supportive but non-diagnostic pediatric feature (peduto2023neurofibromatosistype1 pages 2-4)

Table: This table compiles recent quantitative epidemiology and complication frequencies for neurofibromatosis type 1, emphasizing pooled 2023 estimates and clinically relevant tumor risks. It is useful as a compact evidence summary for disease knowledge base fields on prevalence, incidence, and phenotype burden.

Selected phenotype examples with HPO suggestions (not exhaustive):

1) Café-au-lait macules (CALMs) - Frequency: >95% of infants in one pediatric review (peduto2023neurofibromatosistype1 pages 1-2) - Typical onset: infancy/early childhood; increase until puberty (peduto2023neurofibromatosistype1 pages 2-4) - HPO: Café-au-lait spot (HP:0000957)

2) Axillary/inguinal freckling - Typical onset: around 6–7 years (peduto2023neurofibromatosistype1 pages 1-2) - HPO: Axillary freckling (HP:0000997); Inguinal freckling (HP:0000998)

3) Cutaneous neurofibromas - Frequency: ~90% of adults in pediatric review; guideline states >95% of people with NF1 have cutaneous neurofibromas (peduto2023neurofibromatosistype1 pages 1-2, carton2023erngenturistumour pages 10-12) - HPO: Neurofibroma (HP:0001067); Cutaneous neurofibroma (HP:0012872)

4) Plexiform neurofibromas (PN) - Frequency: ~40–60% (guideline) (carton2023erngenturistumour pages 10-12) - Morbidity: disfigurement, pain, neurologic/motor dysfunction; malignant transformation risk (gross2020selumetinibinchildren pages 1-2, carton2023erngenturistumour pages 10-12) - HPO: Plexiform neurofibroma (HP:0009732)

5) Ophthalmic findings: Lisch nodules and choroidal abnormalities - Lisch nodules: almost all adults, <50% under age 5 (peduto2023neurofibromatosistype1 pages 1-2) - Choroidal abnormalities in children: 60–70% (peduto2023neurofibromatosistype1 pages 2-4) - HPO: Lisch nodules (HP:0009737)

6) Optic pathway glioma (OPG) - Frequency: up to ~20% (“as many as one-fifth”) (tang2023neurofibromatosistype1associated pages 1-2) - Symptomatic fraction: ~20–30% develop symptoms (progressive vision loss, proptosis, diplopia, precocious puberty) (tang2023neurofibromatosistype1associated pages 1-2) - HPO: Optic pathway glioma (HP:0009735); Vision impairment (HP:0000505); Precocious puberty (HP:0000826)

7) Neurocognitive/behavioral features - One 2024 review states cognitive and behavioral disorders affect up to 80% of children with NF1 (park2024recentadvancesin pages 1-2) - HPO: Neurodevelopmental delay (HP:0012758); Learning difficulties (HP:0001328); Attention deficit hyperactivity disorder (HP:0007018) (where applicable)

3.2 Quality of life impact

Adult NF1 has substantial psychosocial burden, especially driven by visibility/disfigurement, stigma, pain, and uncertainty. In a 2023 systematic review of rare genetic skin diseases (including 16 NF1 studies), NF1 was associated with impaired QoL and emotional well-being; severity/visibility predicted QoL burden, and care at NF specialty clinics and genetic counseling were associated with higher self-esteem. (fournier2023psychosocialimplicationsof pages 13-15, fournier2023psychosocialimplicationsof pages 15-16)


4. Genetic / Molecular Information

4.1 Causal gene(s)

4.2 Variant spectrum and functional consequences

  • Large variant diversity is reported; one 2024 review notes >3,197 constitutional NF1 pathogenic variants, with clinically confirmed genotype–phenotype correlations relevant to ~10–15% of patients, and microdeletions ~4.7–11%. (park2024recentadvancesin pages 1-2)
  • A pediatric genotype–phenotype review reports that 90–95% of causative variants are intragenic and <10% are whole-gene deletions including flanking regions. (peduto2023neurofibromatosistype1 pages 11-13)
  • Functional consequence is primarily loss of function in a tumor suppressor, with many NF1 tumors following a “second hit” model (somatic inactivation of the remaining allele). (na2024pastpresentand pages 1-3)

4.3 Modifier genes / related loci

The retrieved evidence emphasizes SPRED1 as a key differential diagnosis (Legius syndrome). Molecular testing for NF1 and SPRED1 is recommended when a child has only pigmentary findings, because Legius syndrome lacks NF1-associated oncologic risks. (peduto2023neurofibromatosistype1 pages 2-4)

4.4 Epigenetic information

In NF1-associated malignant transformation (MPNST), epigenetic regulators are important: PRC2 components (EED/SUZ12) may be inactivated, and loss of H3K27me3 is described as a marker more common in sporadic/radiation-induced MPNST (and mechanistically linked to PRC2 loss). (yao2023malignantperipheralnerve pages 13-14, yao2023malignantperipheralnerve pages 2-4)


5. Environmental Information

NF1 is primarily genetic. In the retrieved evidence, the main non-genetic contributor to malignant risk is radiation exposure (a risk factor for MPNST), and post-radiation MPNST shows particularly poor survival statistics in one review. (yao2023malignantperipheralnerve pages 2-4)


6. Mechanism / Pathophysiology

6.1 Core causal chain (from mutation to phenotype)

  1. Germline NF1 pathogenic variant → reduced/absent neurofibromin.
  2. Neurofibromin is a Ras-GAP that limits Ras signaling; one recent therapeutic-strategy review states neurofibromin “is a Ras GTPase-activating protein (RAS-GAP) that converts active GTP-bound Ras into inactive GDP-bound Ras,” and “Thus, NF1 loss leads to constitutive Ras activation.” (na2024pastpresentand pages 1-3)
  3. Downstream Ras pathway hyperactivation increases output through RAF–MEK–ERK (MAPK) and other axes including PI3K–AKT–mTOR, with tumorigenesis typically requiring a second somatic hit in the remaining allele. (na2024pastpresentand pages 1-3)
  4. Tumor microenvironment cells (e.g., fibroblasts/endothelial cells; immune components) can support tumor growth and are emerging therapeutic targets. (na2024pastpresentand pages 1-3)

Complementary mechanistic detail from a 2023 neurofibromin signaling review emphasizes broad pathway reach beyond MAPK, including cAMP/PKA, cytoskeletal signaling, and post-translational regulation of neurofibromin abundance. (baezflores2023thetherapeuticpotential pages 1-2, baezflores2023thetherapeuticpotential pages 3-4, baezflores2023thetherapeuticpotential pages 5-6)

6.2 Key pathways and suggested ontology terms

Pathways (examples): - Ras/MAPK cascade; RAF–MEK–ERK signaling (na2024pastpresentand pages 1-3, park2024recentadvancesin pages 1-2) - PI3K/AKT/mTOR signaling (na2024pastpresentand pages 1-3, park2024recentadvancesin pages 1-2, baezflores2023thetherapeuticpotential pages 5-6) - cAMP/PKA signaling and neurodevelopmental phenotypes (baezflores2023thetherapeuticpotential pages 3-4, baezflores2023thetherapeuticpotential pages 5-6) - Rho/ROCK/LIMK/cofilin; cytoskeletal remodeling (park2024recentadvancesin pages 1-2, baezflores2023thetherapeuticpotential pages 5-6)

GO Biological Process suggestions (examples): - Ras protein signal transduction (GO:0007265) - MAPK cascade (GO:0000165) - Regulation of cell proliferation (GO:0042127) - Regulation of apoptotic process (GO:0042981) - cAMP-mediated signaling (GO:0019933)

6.3 Cell types and suggested CL terms (examples)

Mechanistic and tumor discussions implicate: - Schwann cell lineage as tumor cell of origin for neurofibromas/MPNST (review emphasis) (na2024pastpresentand pages 5-6) - Optic glioma models implicate progenitor/oligodendrocyte-lineage tumor cells plus microglia and T cells in a supportive immune niche (tang2023neurofibromatosistype1associated pages 6-8)

CL term suggestions (examples): - Schwann cell (CL:0000218) - Microglial cell (CL:0000129) - T cell (CL:0000084) - Oligodendrocyte precursor cell (CL:0002453) (for OPG model context)


7. Anatomical Structures Affected

NF1 is multisystem; major affected anatomical systems include: - Skin/peripheral nerves: café-au-lait macules, freckling, cutaneous and plexiform neurofibromas (peduto2023neurofibromatosistype1 pages 1-2, carton2023erngenturistumour pages 10-12) - Central nervous system/visual system: optic pathway gliomas; non-optic low-grade gliomas (tang2023neurofibromatosistype1associated pages 1-2, carton2023erngenturistumour pages 9-10) - Skeletal system: distinctive osseous lesions used diagnostically (e.g., tibial bowing/pseudarthrosis; sphenoid dysplasia) (peduto2023neurofibromatosistype1 pages 2-4) - Breast tissue: elevated breast cancer risk prompting early MRI screening in guidelines (carton2023erngenturistumour pages 10-12, carton2023erngenturistumour pages 6-7)

UBERON suggestions (examples): - Skin (UBERON:0002097) - Peripheral nerve (UBERON:0001021) - Optic nerve (UBERON:0000966) - Brain (UBERON:0000955) - Tibia (UBERON:0001465) - Breast (UBERON:0000310)


8. Temporal Development (natural history)

Examples of age-dependence: - Freckling tends to appear around age 6–7 (peduto2023neurofibromatosistype1 pages 1-2) - OPG is usually detected in early childhood, often before age 7 (tang2023neurofibromatosistype1associated pages 1-2) - MPNST typically presents between ages 20–40 (guideline) (carton2023erngenturistumour pages 10-12)


9. Inheritance and Population

9.1 Inheritance

9.2 Epidemiology (recent quantitative data)

A 2023 systematic review/meta-analysis estimated: - Pooled prevalence: ~1 in 3,164 (95% CI 1 in 2,132–1 in 4,712). (lee2023incidenceandprevalence pages 1-2) - Pooled birth incidence: ~1 in 2,662 (95% CI 1 in 1,968–1 in 3,601). (lee2023incidenceandprevalence pages 1-2) - Under-recognition: prevalence was higher in screening studies (~1 in 2,020) than in medical-record ascertainment (~1 in 4,329), suggesting under-recognition in routine data. (lee2023incidenceandprevalence pages 2-4, lee2023incidenceandprevalence pages 1-2)


10. Diagnostics

10.1 Clinical diagnostic criteria (2021 revised international consensus)

The 2021 international consensus provides revised NF1 criteria incorporating genetic testing and new ophthalmic imaging features; core requirements are summarized below.

Table (click to expand)
Diagnostic context Requirement / criterion Threshold or specification Notes / differentiation Citation
NF1 diagnosis, individual without an affected parent Two or more diagnostic criteria required Any 2 of the listed NF1 criteria below 2021 international consensus revision (legius2021reviseddiagnosticcriteria pages 2-3, legius2021reviseddiagnosticcriteria media 67536eac)
NF1 diagnosis, child of an affected parent One or more diagnostic criteria required Any 1 listed NF1 criterion Applies when a parent meets NF1 diagnostic criteria (legius2021reviseddiagnosticcriteria pages 2-3, peduto2023neurofibromatosistype1 pages 2-4, legius2021reviseddiagnosticcriteria media 67536eac)
Café-au-lait macules (CALMs) Pigmentary criterion ≥6 CALMs; diameter >5 mm in prepubertal individuals and >15 mm in postpubertal individuals Bilateral distribution is typical; isolated pigmentary findings in young children can overlap with Legius syndrome (legius2021reviseddiagnosticcriteria pages 2-3, peduto2023neurofibromatosistype1 pages 2-4, legius2021reviseddiagnosticcriteria media 67536eac)
Axillary or inguinal freckling Pigmentary criterion Present in axillary and/or inguinal region Can also occur in Legius syndrome; not sufficient alone to distinguish NF1 (legius2021reviseddiagnosticcriteria pages 2-3, peduto2023neurofibromatosistype1 pages 2-4, legius2021reviseddiagnosticcriteria media 67536eac)
Neurofibromas / plexiform neurofibroma Tumor criterion ≥2 neurofibromas of any type or 1 plexiform neurofibroma Plexiform neurofibroma is highly supportive of NF1 and not a feature of Legius syndrome (legius2021reviseddiagnosticcriteria pages 2-3, peduto2023neurofibromatosistype1 pages 2-4, legius2021reviseddiagnosticcriteria media 67536eac)
Optic pathway glioma Tumor criterion Presence of optic pathway glioma Included as a standalone diagnostic feature (legius2021reviseddiagnosticcriteria pages 2-3, peduto2023neurofibromatosistype1 pages 2-4, legius2021reviseddiagnosticcriteria media 67536eac)
Iris Lisch nodules / choroidal abnormalities Ophthalmic criterion ≥2 iris Lisch nodules identified by slit lamp or ≥2 choroidal abnormalities detected by OCT/NIR imaging Choroidal abnormalities were added in the revised criteria (legius2021reviseddiagnosticcriteria pages 2-3, peduto2023neurofibromatosistype1 pages 2-4, legius2021reviseddiagnosticcriteria media 67536eac)
Distinctive osseous lesion Skeletal criterion Sphenoid dysplasia, anterolateral bowing of the tibia, or pseudarthrosis of a long bone Revised wording emphasizes distinctive NF1-associated osseous lesions (legius2021reviseddiagnosticcriteria pages 2-3, peduto2023neurofibromatosistype1 pages 2-4, legius2021reviseddiagnosticcriteria media 67536eac)
Molecular criterion Genetic criterion Heterozygous pathogenic NF1 variant with approximately 50% variant allele fraction in apparently normal tissue (e.g., blood) Allows diagnosis using molecular testing; especially useful in young children or atypical presentations (legius2021reviseddiagnosticcriteria pages 2-3, peduto2023neurofibromatosistype1 pages 2-4, legius2021reviseddiagnosticcriteria media 67536eac)
Mosaic NF1 Special consideration Separate recommendations proposed Mosaic forms were specifically addressed by the consensus, but are not captured by the standard simplified rows above (legius2021reviseddiagnosticcriteria pages 1-2, legius2021reviseddiagnosticcriteria media 67536eac)
Legius syndrome differentiation Distinguishing related condition ≥6 bilateral CALMs and no other NF1 diagnostic criteria except possible freckling, or heterozygous pathogenic SPRED1 variant (~50% VAF) Legius syndrome can mimic early pigmentary NF1 but does not carry NF1-related oncologic risks (legius2021reviseddiagnosticcriteria pages 2-3, peduto2023neurofibromatosistype1 pages 2-4, legius2021reviseddiagnosticcriteria media 67536eac)

Table: This table summarizes the 2021 international consensus diagnostic criteria for neurofibromatosis type 1, including the different threshold for individuals with and without an affected parent. It also briefly distinguishes Legius syndrome, an important overlapping condition in children with pigmentary findings.

Visual primary-source evidence: Table images of the revised diagnostic criteria were retrieved from the consensus publication (legius2021reviseddiagnosticcriteria media 67536eac, legius2021reviseddiagnosticcriteria media 57806d8a).

10.2 Genetic testing approach

The revised criteria explicitly allow diagnosis via identification of a heterozygous pathogenic NF1 variant (~50% variant allele fraction in normal tissue) as one diagnostic feature, supporting molecular diagnosis especially in young children or atypical cases. (peduto2023neurofibromatosistype1 pages 2-4, legius2021reviseddiagnosticcriteria pages 2-3)

10.3 Imaging / biomarkers

10.4 Differential diagnosis

A critical differential in pigment-only presentations is Legius syndrome (SPRED1), which overlaps with café-au-lait macules ± freckling but lacks NF1 tumor risks; molecular analysis of NF1 and SPRED1 is recommended in such cases. (peduto2023neurofibromatosistype1 pages 2-4)


11. Outcome / Prognosis

11.1 Cancer burden

ERN GENTURIS reports markedly increased cancer burden: lifetime cancer risk 59.6% in NF1 vs 30.8% in the general population. (carton2023erngenturistumour pages 1-2)

11.2 MPNST prognosis

A 2023 MPNST clinical management review reports overall poor outcomes with a 5-year overall survival ~50–60% and median survival about 6 years, noting NF1-associated cases have worse survival than sporadic tumors. (yao2023malignantperipheralnerve pages 11-13)

11.3 Quality of life / psychosocial outcomes

A 2023 systematic review synthesizing adult NF1 studies (n≈1,180 across 16 studies) highlights stigma, anxiety/depression, and functional limitations. It reports that severity and visibility predict poorer QoL, and that self-esteem was higher in those receiving care at NF clinics or genetic counseling. (fournier2023psychosocialimplicationsof pages 13-15, fournier2023psychosocialimplicationsof pages 15-16)


12. Treatment

12.1 Pharmacotherapy and targeted therapy (plexiform neurofibromas)

The treatment landscape for symptomatic, inoperable NF1 plexiform neurofibromas has been transformed by MEK inhibition.

Table (click to expand)
Publication / milestone Year Population Design / setting Response / efficacy Clinical outcomes / implementation notes Key adverse events / monitoring URL Citation
Gross et al., NEJM 2020 50 children with NF1 and symptomatic, inoperable plexiform neurofibromas; median age 10.2 years Open-label phase 2 trial; selumetinib 25 mg/m² twice daily continuously in 28-day cycles; volumetric MRI and patient-reported/functional outcomes assessed serially Confirmed partial response in 35/50 (70%); 28/35 responses durable for ≥1 year Mean child-reported tumor pain intensity decreased by 2 points after 1 year; clinically meaningful improvements in pain interference (child 38%, parent 50%), overall HRQoL (child 48%, parent 58%), strength (56%), and range of motion (38%); established selumetinib as first highly active systemic therapy for pediatric NF1-PN Most frequent toxicities: nausea/vomiting/diarrhea, asymptomatic creatine phosphokinase increase, acneiform rash, paronychia; 5 discontinued for toxicity; 6 had progression https://doi.org/10.1056/NEJMoa1912735 (gross2020selumetinibinchildren pages 1-2)
Gross et al., Neuro-Oncology long-term follow-up 2023 74 children (phase 1/2 cohort), median age 10.3 years, NF1 with inoperable symptomatic PN Long-term phase 1/2 follow-up of SPRINT (NCT01362803); continuous selumetinib; safety/efficacy through ~5 additional years Overall confirmed partial response 52/74 (70%); median treatment duration 57.5 cycles; 59% of responses lasted ≥12 cycles Durable improvement in tumor pain intensity (P=.015) and pain interference (P=.0059) through 48 cycles; supports long-term use in practice with sustained benefit and need for extended follow-up No new safety signals, but known AEs may first appear after several years; ongoing labs, echocardiograms, and ophthalmologic monitoring recommended https://doi.org/10.1093/neuonc/noad086 (gross2023longtermsafetyand pages 1-2)
Casey et al., FDA approval summary, Clin Cancer Res 2021 Pediatric patients ≥2 years with symptomatic, inoperable NF1-associated PN Regulatory review of single-arm multicenter trial data supporting approval Overall response rate 66% (95% CI 51–79); median duration of response not reached; 82% of responders had response duration ≥12 months FDA approved selumetinib (Koselugo) on April 10, 2020 for pediatric NF1 patients ≥2 years with symptomatic, inoperable PN; supported by radiographic response plus clinical outcome assessments Class MEK inhibitor toxicities emphasized: ocular, cardiac, musculoskeletal, gastrointestinal, dermatologic https://doi.org/10.1158/1078-0432.CCR-20-5032 (casey2021fdaapprovalsummary pages 1-1)
Armstrong et al., BMC Cancer review 2023 Children with NF1-related PN (clinical practice focus) Narrative clinical decision review on surgery, watchful waiting, and MEK inhibitor use Summarizes selumetinib activity as ~70% tumor volume reduction response in pivotal pediatric trial Selumetinib described as the only licensed medical therapy for pediatric symptomatic, inoperable NF1-PN at the time; treatment should be individualized by multidisciplinary teams based on tumor size/location, adjacent tissue effects, symptoms, and family preferences Review highlights need to balance benefits with MEK inhibitor toxicities and long treatment duration https://doi.org/10.1186/s12885-023-10996-y (gross2020selumetinibinchildren pages 1-2)
Azizi et al., Neuro-Oncology Practice AE consensus 2024 Pediatric NF1 patients with PN receiving selumetinib Modified Delphi expert consensus for prevention/management of selumetinib-associated adverse events in real-world care Not an efficacy trial; implementation-focused guidance based on accumulated trial and expanded-access experience Consensus agreement reached for 36 statements; supports practical toxicity management to keep patients on effective therapy when possible Reported AE frequencies include vomiting 86%, diarrhea 81%, dry skin 65%, elevated CPK 77%, decreased LVEF 28%, increased blood pressure 18%, blurred vision 15%; rare ocular events include central serous retinopathy 0.6% and retinal vein occlusion 0.3% https://doi.org/10.1093/nop/npae038 (azizi2024consensusrecommendationson pages 1-2)

Table: This table summarizes the pivotal selumetinib evidence base for NF1-associated plexiform neurofibromas, including the landmark pediatric trials, FDA approval, and 2024 adverse-event management guidance. It is useful for quickly linking efficacy, real-world implementation, and safety monitoring considerations.

Key primary-trial efficacy highlights: - In the pivotal pediatric phase 2 trial, confirmed partial response occurred in 70% (35/50) with many durable responses; pain and QoL improved meaningfully. (gross2020selumetinibinchildren pages 1-2) - Long-term follow-up (up to ~5 additional years) maintained 70% confirmed partial response in a larger cohort (52/74) with durable pain improvements and no new safety signals, but ongoing monitoring is required because known adverse events may appear later. (gross2023longtermsafetyand pages 1-2)

12.2 Treatment adverse events and real-world implementation guidance (2024)

A 2024 European expert panel (modified Delphi) produced consensus recommendations for prevention and management of selumetinib-associated adverse events and reported clinically relevant AE frequencies (e.g., vomiting 86%, diarrhea 81%, elevated CPK 77%, decreased LVEF 28%). (azizi2024consensusrecommendationson pages 1-2)

12.3 Surgical and interventional care

Surgery remains important for selected tumors/lesions (e.g., resectable ANNUBP, certain symptomatic gliomas), but is often limited by tumor location and morbidity. For MPNST, ERN GENTURIS states there is no place for watchful waiting and recommends urgent resection when feasible. (carton2023erngenturistumour pages 9-10, carton2023erngenturistumour pages 10-12)

12.4 Ongoing and recent clinical trials (real-world pipeline)

Examples of MEK inhibitor trials and post-authorization studies: - NCT01362803: Selumetinib (AZD6244) Phase I/II in children with NF1 PN; ACTIVE_NOT_RECRUITING. (NCT01362803 chunk 1) - NCT03962543 (ReNeu): Mirdametinib Phase 2b single-group in adults and children with inoperable symptomatic NF1 PN; ACTIVE_NOT_RECRUITING; primary completion 2023-09-20. (NCT03962543 chunk 1) - NCT05388370: Selumetinib post-authorisation safety study (PASS) prospective cohort; ACTIVE_NOT_RECRUITING; follow-up to 2028; monitoring includes LVEF reduction, physeal dysplasia, ocular toxicity, pubertal development. (NCT05388370 chunk 1) - NCT03231306: Binimetinib Phase II in children and adults with NF1 PN; COMPLETED with completion date 2024-04-17. (NCT03231306 chunk 1)

MAXO suggestions (examples): - MEK inhibitor therapy (MAXO term suggestion; no MAXO ID provided in retrieved evidence) - MRI surveillance (MAXO suggestion) - Genetic counseling (MAXO suggestion; supported as beneficial for self-esteem in adult NF1 systematic review) (fournier2023psychosocialimplicationsof pages 13-15)


13. Prevention

Primary prevention is not currently available for a germline genetic disorder, but secondary/tertiary prevention via surveillance is central.

ERN GENTURIS (2023) provides age-stratified surveillance recommendations, including: - Regular clinical assessments (at least annually in young children), - Ophthalmologic surveillance for OPG with OCT when feasible, - Imaging strategies for internal tumor burden at transition to adulthood (e.g., WB-MRI at least once), - Breast cancer screening: annual MRI starting as soon after age 30 as feasible until 50. (carton2023erngenturistumour pages 6-7, carton2023erngenturistumour pages 7-8)


14. Other Species / Natural Disease

The retrieved sources did not include naturally occurring NF1 disease descriptions in non-human species.


15. Model Organisms

NF1 optic pathway glioma research frequently uses genetically engineered mouse models. These models provide mechanistic insight into gliomagenesis, retinal ganglion cell injury, and the role of immune/microenvironmental cells (microglia and T cells) and neuronal activity factors in tumor initiation and progression. (tang2023neurofibromatosistype1associated pages 1-2, tang2023neurofibromatosistype1associated pages 6-8)


Recent developments and expert analysis (2023–2024 highlights)


Notes on PMID availability

Within the retrieved full-text excerpts, PMIDs were not consistently provided, so PMID-level indexing could not be verified for every citation in this tool run. All major claims are instead linked to specific retrieved documents via the provided context IDs and include DOIs/URLs and publication months/years as available.

References

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