CDKN2A-Verlust (homozygotes Löschen oder Biallelic-Inaktivierung)
Deterministische Ansicht der Quelle YAML Entität. Klinische Autorität bleibt mit den zitierten Quell-IDs und Rezensenten Sign-off Zustand.
| ID | BIO-CDKN2A |
|---|---|
| Art | Biomarker |
| Aliase | 9p21 StreichungCDKN2A-Verlustp14ARF-Verlustp16 VerlustВтрата CDKN2A (гомозиготна делеція або біалельна інактивація) |
| Status | reviewed 2026-04-27 | pending_clinical_signoff |
| Erkrankungen | DIS-CHONDROSARCOMA DIS-MPNST |
| Quellen | SRC-ESMO-NSCLC-METASTATIC-2024 SRC-NCCN-MELANOMA-2025 |
Biomarker-Fakten
| Biomarker-Typ | copy_number |
|---|---|
| Angaben zur Mutation | {"functional_impact": "Loss of p16(INK4a) tumor-suppressor (CDK4/6 inhibition lost — Rb constitutively phosphorylated) and loss of p14(ARF) (MDM2 destabilization of p53 lost)", "gene": "CDKN2A", "gene_hugo_id": "HGNC:1787", "hotspots": ["Homozygous deletion (9p21.3 — most common mechanism)", "Biallelic inactivation: deletion + mutation", "Promoter hypermethylation (silencing without copy loss)"], "variant_type": "deletion / loss-of-function"} |
| Messung | VerfahrenDNA-NGS mit Kopiernummermodul (vorzugsweise) ODER FISH (9p21) ODER p16 IHC (Verlust korreliert mit biallelic Inaktivierung) EinheitenKopiernummer (0 = homozygote Streichung, 1 = heterozygoter Verlust, 2 = neutral) SensitivitätsanforderungTumorzellularität ≥ 30% empfohlen für Kopiernummer Anruf auf DNA-NGS |
| Verwandte Biomarker | BIO-TP53-MUTATION |
Anmerkungen
~50% of melanoma, ~50% of squamous NSCLC, ~80% of MPNST, ~50% of glioblastoma, ~30% of pancreatic. Marker of poor prognosis across many tumors. No directly approved targeted agent — CDK4/6 inhibitors (palbociclib, ribociclib, abemaciclib) are biologically rational (synthetic-lethal hypothesis: loss of p16 → reliance on CDK4/6) but no large positive trial in solid tumors outside HR+ breast. Selective CDK7 / PRMT5 inhibitors in development for MTAP-codeleted (9p21 co-deletion) tumors. In MPNST, CDKN2A loss is near-universal in malignant transformation from neurofibroma.
Verwendet von
Biomarker
BIO-1P19Q-CODELETION- 1p/19q CodeletionBIO-ATRX-MUTATION- ATRX-Mutation / ATRX-Verlust (IHC)BIO-FBXW7- FBXW7 FunktionsverlustmutationBIO-RB1- RB1-Funktionsverlust (Retinoblastomprotein)BIO-TERT- TERT-Promotor-Mutation (C228T / C250T)
Erkrankung
DIS-CHONDROSARCOMA- ChondrosarkomDIS-GLIOMA-LOW-GRADE- Niedriggradiges Gliom (LGG, WHO Grad 2 — IDH-mutant)DIS-MASTOCYTOSIS- Fortgeschrittene systemische Mastozytose (AdvSM)DIS-MPNST- bösartiger peripherer Nervenscheidentumor (MPNST)
Warnhinweis
RF-CHONDROSARCOMA-HIGH-RISK-BIOLOGY- Unerwünschtes Subtyp oder molekulares Merkmal im Chondrosarkom: dedifferenter Subtyp (hoch-gr...RF-MPNST-HIGH-RISK-BIOLOGY- MPNST with adverse molecular / clinical features: biallelic CDKN2A/B loss (>80% high-grad...