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[Vulvar intraepithelial neoplasias].

Françoise Plantier1

  • 1Cabinet de dermatopathologie Mathurin-Moreau, hôpital Cochin Paris, Paris 19(e), Paris, France.

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|March 21, 2021
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Summary

Vulvar squamous cell carcinoma originates from precursor lesions, vulvar intraepithelial neoplasias (VIN). Understanding HPV-related and HPV-independent VIN is crucial for diagnosing and managing these vulvar cancers.

Keywords:
Carcinome épidermoïdeDifferentiated type VIN HPVHPVHSILHigh grade squamous intraepithelial lesionNéoplasie intraépithélialeP16VINVIN classic typeVIN differenciéeVIN indifférenciéVIN type classiqueVulva squamous cell carcinomaVulveintraepithélial neoplasia

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Area of Science:

  • Gynecologic Oncology
  • Dermatopathology
  • Oncologic Pathology

Background:

  • Vulvar squamous cell carcinoma (VSCC) develops from precursor lesions known as vulvar intraepithelial neoplasias (VIN).
  • VIN lesions are broadly categorized based on their association with human papillomavirus (HPV) or HPV-independence.
  • HPV-independent VIN often occurs in older women with chronic dermatoses like lichen sclerosus and has a higher invasive potential.

Purpose of the Study:

  • To delineate the clinical, histological, and biomarker characteristics of various VIN precursor lesions.
  • To improve the diagnostic accuracy and understanding of HPV-related and HPV-independent VIN.
  • To clarify the nature of precursor lesions leading to well-differentiated and verrucous VSCC.

Main Methods:

  • Review and synthesis of clinical presentations of VIN.
  • Histopathological analysis of VIN subtypes.
  • Examination of immunohistochemical and molecular biomarkers associated with VIN and VSCC.

Main Results:

  • Usual type/high-grade squamous intraepithelial lesion (uVIN/HSIL) is the HPV-related precursor with variable presentation and low invasive potential.
  • HPV-independent VIN, associated with lichen sclerosus, presents diagnostic challenges and higher invasive potential.
  • A distinct precursor for well-differentiated/verrucous VSCC remains poorly defined.

Conclusions:

  • Accurate classification of VIN subtypes based on HPV status and histology is essential for risk stratification.
  • Further research is needed to define the precursor for verrucous and well-differentiated VSCC.
  • Biomarker analysis aids in understanding the pathogenesis and progression of VIN.