ID
106
Cancer Name
Vulvar Squamous Cell Carcinoma – Non-Viral
Main Grouping
Reproductive
Organ System
Vulva
Cell Origin
Squamous epithelium
Pathways Affected
ulvar squamous cell carcinoma in the non-viral pathway involves a pathway landscape uniquely defined by the TERT promoter mutation/telomere maintenance pathway (~93% of HPV-independent cases), TP53/p53 tumor suppressor pathway (~53-87%), CDKN2A/p16/CDK4/RB1 cell cycle checkpoint (~67%), NOTCH1/FAT1 signaling (~47% each — enriched in HPV-independent disease), HRAS/MAPK/ERK/PI3K/AKT pathway (HRAS activating mutations in a subset), EGFR/MAPK/STAT3 pathway (EGFR amplification ~12%), and the chronic lichen sclerosus-driven NF-kB inflammatory carcinogenesis pathway.
The TERT promoter mutation/telomere maintenance pathway is the most frequently enriched molecular alteration in HPV-independent vulvar SCC: TERT promoter mutations (C228T or C250T hotspot mutations creating new ETS transcription factor binding sites — confirmed in approximately 93% of HPV-independent vulvovaginal SCC by MSK-IMPACT analysis) drive constitutive TERT (telomerase reverse transcriptase) expression creating replicative immortality; in normal vulvar squamous epithelial cells, telomerase is epigenetically silenced in differentiated cells; TERT promoter mutations create de novo ETS/TCF binding sites driving constitutive TERT transcription independent of normal developmental regulation; normal epithelium undergoes telomere shortening with each cell division leading to replicative senescence — TERT promoter mutations bypass this replicative checkpoint; telomere maintenance through TERT additionally activates Wnt/beta-catenin signaling through direct interaction with beta-catenin (independently of the telomere function); quercetin inhibits TERT expression in cancer cell models targeting the constitutive TERT transcription from TERT promoter mutations in HPV-independent VSCC; EGCG inhibits TERT in cancer cell models; curcumin inhibits TERT in cancer cell models.
The TP53/p53 pathway disruption is the second most defining molecular event in HPV-independent VSCC: TP53 mutations in approximately 53-87% of HPV-negative VSCC — representing direct somatic p53 mutation rather than HPV E6-mediated p53 ubiquitination and degradation that operates in HPV-positive VSCC; TP53 mutations in HPV-independent VSCC are predominantly gain-of-function missense mutations creating oncogenic p53 proteins that actively promote invasion, angiogenesis, and metabolic reprogramming (creating IHC pattern of diffuse p53 overexpression), or truncating/nonsense mutations (creating complete p53 protein loss by IHC — null/absent pattern) or splice site mutations; TP53 somatic mutations shared between lichen sclerosus, dVIN, and HPV-independent VSCC confirmed genome-wide — establishing early acquisition in the lichen sclerosus precursor; CDKN2A/p16INK4a alterations (~67%) compound p53 pathway disruption — CDKN2A encodes p14ARF (which normally sequesters MDM2 preserving p53 stability) and p16INK4a (CDK4/CDK6 inhibitor preserving RB1-mediated cell cycle arrest) — combined TP53/CDKN2A loss creates dual disruption of both the direct p53 apoptosis/senescence program and the p14ARF/MDM2/p53 stability regulation; quercetin activates p53 and targets CDK4/CDK6 in squamous carcinoma cell models; curcumin inhibits MDM2 in cancer cell models.
The NOTCH1/FAT1/WNT/Hippo pathway is particularly enriched in HPV-independent VSCC (~47% each, vs. HPV-positive): NOTCH1 activating mutations create constitutive Notch signaling — NICD/CSL/MAML transcriptional activation driving HES1, HEY1, cyclin D1, and cancer stem cell maintenance; FAT1 inactivating mutations disrupt FAT1's tumor suppressor function in regulating WNT/beta-catenin and Hippo/YAP signaling — FAT1 normally inhibits WNT/beta-catenin (through direct binding and promoting beta-catenin degradation) and activates the Hippo tumor suppressor kinase cascade (LATS1/2 phosphorylating and inactivating YAP/TAZ); FAT1 loss therefore creates simultaneous WNT/beta-catenin activation and YAP/TAZ constitutive nuclear activity; quercetin inhibits NOTCH1 and WNT/beta-catenin in squamous carcinoma cell models; curcumin inhibits WNT/beta-catenin and Notch in squamous carcinoma models.
Description
Vulvar squamous cell carcinoma (VSCC) is a rare gynecologic malignancy representing approximately 3 to 5 percent of all female genital tract cancers and approximately 5.6 percent of all gynecologic malignancies. In the United States, approximately 6,500 to 7,000 new cases of vulvar cancer are diagnosed annually, with VSCC comprising approximately 90 percent of all vulvar cancers. Globally, an estimated 45,000 new vulvar cancer cases occur annually. Vulvar cancer is predominantly a disease of older women — the median age at diagnosis is approximately 65 to 70 years for HPV-independent VSCC compared to approximately 45 to 55 years for HPV-associated VSCC — reflecting the different biological pathways and timelines to malignant transformation.
The non-viral HPV-independent pathway — which this template emphasizes — accounts for approximately 30 to 40 percent of all VSCC and is characterized by a distinctly different molecular biology, older patient age, worse prognosis, higher recurrence rates, and relative resistance to chemoradiotherapy compared to HPV-associated VSCC. The HPV-independent pathway proceeds through: chronic vulvar inflammatory disease (primarily lichen sclerosus — a chronic autoimmune inflammatory condition of the vulvar skin) → differentiated vulvar intraepithelial neoplasia (dVIN, formerly simplex VIN or differentiated VIN) → invasive VSCC; genome-wide analysis has confirmed the clonal relationship between lichen sclerosus, dVIN, and HPV-independent VSCC through shared TP53 mutations and CDKN2A promoter methylation.
The molecular landscape of HPV-independent VSCC is defined by: TERT promoter mutations (~93% of HPV-independent vulvovaginal SCC — the most consistently enriched alteration creating constitutive telomerase expression and replicative immortality); TP53 mutations (~53-87%) representing direct somatic p53 pathway disruption rather than HPV E6-mediated p53 degradation; CDKN2A alterations (~67%) — homozygous deletion and promoter methylation removing p16INK4a/p14ARF tumor suppressor functions; NOTCH1 mutations (~47%) — enriched in HPV-independent disease; FAT1 mutations (~47%) — FAT1 (FAT atypical cadherin 1) inactivation activates WNT/beta-catenin and YAP/Hippo signaling; HRAS activating mutations in a subset creating constitutive RAS/MAPK/PI3K activation; and EGFR amplification (~12%) and CCND1 amplification (~22%) creating additional proliferative signaling.
Overall 5-year OS by FIGO stage: stage I ~80-90%; stage II ~60-70%; stage III ~30-50%; stage IV ~15-25%; HPV-independent VSCC has consistently worse OS and higher local recurrence rates than HPV-associated VSCC at equivalent stages confirmed in population-based studies.
Published laboratory research confirms quercetin from onions suppressed viability of squamous cell carcinoma cells; induced G2/M arrest confirmed by flow cytometry; suppressed migration and invasion confirmed; EMT via Slug suppressed confirmed; MMP inhibited confirmed; normal keratinocyte-sparing confirmed (PMC7037689) — directly applicable to vulvar SCC sharing identical squamous histology and EGFR/TP53/EMT invasion biology.
Plant-Based Description
Whole-food plant-based dietary patterns provide phytochemicals with confirmed activity in squamous cell carcinoma cell lines directly applicable to vulvar squamous cell carcinoma in the non-viral pathway. Quercetin from onions and kale was confirmed to suppress viability of oral squamous cell carcinoma (OSCC) cells by MTT assay; induce G2/M cell cycle arrest confirmed by flow cytometry; not affect normal keratinocytes confirmed; suppress migration confirmed by wound-healing assay; inhibit invasion confirmed; suppress EMT through Slug pathway confirmed by Western blot; inhibit MMP confirmed (PMC7037689) — directly applicable to vulvar SCC sharing identical squamous histology, TP53 alteration, EGFR overexpression, and EMT/invasion biology; quercetin additionally inhibits TERT expression in cancer cell models targeting the ~93% TERT promoter mutations; curcumin confirmed to inhibit EGFR/Akt/ERK1/2/STAT3 in SCC-25 squamous carcinoma cells by Western blot (PMC4230161) — targeting EGFR amplification (~12%) and HRAS/MAPK/ERK activation in non-viral VSCC; EGCG inhibits TERT and EGFR in squamous carcinoma models; sulforaphane activates Nrf2 targeting the chronic lichen sclerosus oxidative inflammatory carcinogenesis pathway.
Plant Chemistry Detail
Quercetin from onions, kale, and apples has confirmed activity in squamous cell carcinoma cell lines sharing the identical histology and molecular drivers of non-viral vulvar SCC in a published study (PMC7037689 — "Quercetin Inhibits Cell Survival and Metastatic Ability via the EMT-Mediated Pathway in Oral Squamous Cell Carcinoma") using OSCC cell lines. In this confirmed study: quercetin suppressed the viability of OSCC squamous cell carcinoma cells confirmed by MTT assay — targeting proliferative survival signaling from HRAS activating mutations (G12V/G12S — constitutive MAPK/ERK/PI3K activation), EGFR amplification (~12% VSCC), and TERT promoter-driven replicative immortality; quercetin induced cell cycle arrest at G2/M phase confirmed by flow cytometry — directly targeting CDKN2A-deleted (~67% HPV-independent VSCC) and CCND1-amplified (~22%) cell cycle dysregulation creating G1/S checkpoint failure and dependence on G2/M for cell cycle control; quercetin did not affect cell viability of normal human keratinocytes (HaCaT and nHOK) confirmed — establishing cancer-selective activity relevant to the vulvar squamous epithelium; quercetin suppressed OSCC cell migration confirmed by wound-healing assay — targeting the invasive phenotype of VSCC which spreads by direct extension to the vagina, urethra, and anus; quercetin inhibited OSCC cell invasion confirmed; EMT suppressed through Slug (SNAI2) pathway confirmed by Western blot and immunofluorescence — Slug is a key EMT transcription factor downregulating E-cadherin and driving VSCC invasion; MMP activity inhibited confirmed — targeting MMP-driven extracellular matrix degradation required for VSCC invasion and perineural spread; quercetin additionally decreased TGF-beta1-induced EMT in HaCaT keratinocytes confirmed — targeting the TGF-beta1 pro-invasive signaling in the lichen sclerosus-derived inflammatory microenvironment.
Curcumin from turmeric was confirmed to inhibit proliferation of SCC-25 oral squamous cell carcinoma cells; G2/M arrest confirmed; EGFR phosphorylation at Y1068/Y1173 inhibited confirmed by Western blot — directly targeting EGFR amplification and EGFR overexpression in non-viral VSCC; Akt phosphorylation reduced confirmed by Western blot — targeting the PI3K/AKT/mTOR survival signaling active in HRAS-mutant and EGFR-amplified non-viral VSCC; ERK1/2 phosphorylation reduced confirmed by Western blot — targeting constitutive MAPK/ERK activation from HRAS activating mutations in HPV-independent VSCC; STAT3 phosphorylation (Y705) reduced confirmed by Western blot — targeting JAK/STAT3 survival gene expression; MMP-2, MMP-9, uPA, and uPAR downregulated confirmed (PMC4230161). EGCG from green tea inhibits TERT in cancer cell models — directly targeting the ~93% TERT promoter mutation-driven constitutive telomerase expression in HPV-independent VSCC; EGCG inhibits EGFR, Notch, and PI3K/AKT in squamous carcinoma models. Sulforaphane activates Nrf2/ARE and inhibits NF-kB — targeting the chronic lichen sclerosus NF-kB inflammatory oxidative stress driving the LS → dVIN → invasive VSCC carcinogenic sequence. Quercetin inhibits NOTCH1 and WNT/beta-catenin targeting NOTCH1 mutations (~47%) and FAT1-loss WNT activation (~47%) in HPV-independent VSCC.
Nutritional Focus
Nutritional focus in vulvar squamous cell carcinoma – non-viral targets the TERT promoter mutations (~93% HPV-independent), TP53 mutations (~53-87%), CDKN2A alterations (~67%), NOTCH1/FAT1 mutations (~47% each), and HRAS activating mutations in a subset with EGFR amplification (~12%). Quercetin from onions confirmed to suppress squamous cell carcinoma cell viability MTT assay; G2/M arrest confirmed; normal keratinocyte-sparing confirmed; migration suppressed wound-healing; invasion inhibited; EMT via Slug suppressed Western blot immunofluorescence; MMP inhibited confirmed (PMC7037689) — directly applicable to vulvar SCC squamous histology and TP53/EGFR/EMT invasion biology; quercetin inhibiting TERT in cancer cell models targeting the defining ~93% TERT promoter mutation-driven telomerase in HPV-independent VSCC; quercetin inhibiting NOTCH1 and WNT/beta-catenin targeting NOTCH1 mutations (~47%) and FAT1-loss WNT activation (~47%) enriched in non-viral VSCC; curcumin from turmeric confirmed to inhibit EGFR Y1068/Y1173, p-Akt, p-ERK1/2, p-STAT3, MMP-2/9/uPA/uPAR in SCC-25 squamous carcinoma cells by Western blot confirmed (PMC4230161) — directly targeting EGFR amplification (~12%) and HRAS/MAPK/ERK in non-viral VSCC; EGCG from green tea inhibiting TERT targeting ~93% TERT promoter mutations; inhibiting EGFR and NOTCH in squamous carcinoma models; sulforaphane from cruciferous vegetables activating Nrf2/ARE and inhibiting NF-kB targeting the chronic lichen sclerosus NF-kB inflammatory oxidative stress driving the LS → dVIN → invasive VSCC carcinogenesis pathway; sulforaphane inducing p21/CDKN1A targeting CDKN2A-deleted (~67%) VSCC cell cycle vulnerability; dietary fiber producing butyrate/SCFAs inhibiting HDAC targeting CDKN2A and TERT promoter methylation in non-viral VSCC.
Research Notes
VSCC epidemiology: ~6,500-7,000 new US cases/year; ~5.6% of all gynecologic malignancies; ~90% squamous cell carcinoma; VSCC ~3-5% of all female genital cancers; globally ~45,000 new cases/year; increasing incidence in younger women (HPV-associated) but non-viral VSCC remains disease of older women; HPV-independent VSCC ~30-40% of all VSCC; median age HPV-independent ~65-70 years (vs. ~45-55 years HPV-associated); labia majora ~65% of site distribution; 5-year OS: stage I ~80-90%; II ~60-70%; III ~30-50%; IV ~15-25%; HPV-independent VSCC worse OS and higher recurrence vs. HPV-associated confirmed in population studies. Non-viral pathway: lichen sclerosus (LS) → differentiated VIN (dVIN) → HPV-independent VSCC — genome-wide analysis confirmed clonal relationship with shared TP53 and CDKN2A alterations in all three lesions. IHC: p16 negative (HPV-independent); p53 aberrant (diffuse overexpression = gain-of-function missense; null/absent = truncating; cytoplasmic pattern); p53 IHC most useful surrogate for HPV-independent status. Molecular (MSK-IMPACT HPV-independent vulvovaginal SCC series n=15): TERT promoter mutations 93% (the defining molecular enrichment for HPV-independent disease — odds ratio 0.01 vs. HPV-positive); TP53 mutations 87%; CDKN2A alterations 67%; NOTCH1 mutations 47%; FAT1 mutations 47%; PIK3CA mutations variable; HRAS activating mutations ~10-25% enriched non-viral; EGFR amplification ~12% enriched HPV-negative with poor prognosis (confirmed Growdon et al.); CCND1 amplification ~22% enriched HPV-negative (confirmed Choschzick et al.); PTEN subset; PPP2R1A subset; KRAS subset; NOTCH pathway collectively ~67% HPV-independent. Quercetin OSCC squamous CC (PMC7037689): viability MTT; G2/M flow cytometry; keratinocyte-sparing; migration wound-healing; invasion; Slug/EMT Western blot immunofluorescence; MMP inhibited. Curcumin SCC-25 (PMC4230161): EGFR/p-Akt/p-ERK1/2/p-STAT3/MMP-2/9 confirmed.
Notes Visibility
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Key Foods
Turmeric,Broccoli,Kale,Spinach,Brussels Sprouts,Cauliflower,Garlic,Yellow Onion,Carrot,Tomato,Beetroot,Cabbage,Blueberry,Pomegranate,Grape,Raspberry,Apple,Orange,Lemon,Soybeans,Edamame,Green Lentils,Black Beans,Chickpeas,Brown Rice,Quinoa,Oats,Wild Rice,Black Rice,Walnut,Almond,Brazil Nut,Flaxseed,Pumpkin Seeds,Chia Seeds,Sesame Seeds,Hemp Seeds,Shiitake,Maitake,Lions Mane,Cremini,Portobello,Green Tea,Ginger,Black Pepper,Garlic Powder,Parsley,Rosemary,Oregano
, Celery, Leek,Avocado,Artichoke,Radish,Tangerine, Red Onion
Linked Nutrients
vitamin-c,vitamin-e,vitamin-a,vitamin-b9,vitamin-b6,selenium,zinc,magnesium,calcium,potassium,iron,quercetin,curcumin,egcg,sulforaphane,beta-carotene,anthocyanins,dietary-fiber,l-theanine,allicin
