Vulvar intraepithelial neoplasia

Vulvar intraepithelial neoplasia (VIN) is a precancerous condition affecting the vulva, in which abnormal cells develop within the surface epithelium (skin) of the vulvar region. It is classified as a carcinoma in situ, meaning the abnormal cells have not yet invaded deeper tissues. VIN is broadly categorized into two main types: usual-type VIN (uVIN), which is strongly associated with persistent human papillomavirus (HPV) infection (particularly HPV types 16 and 18), and differentiated VIN (dVIN), which is less common and typically arises in the setting of chronic vulvar dermatoses such as lichen sclerosus. Differentiated VIN carries a higher risk of progression to invasive vulvar squamous cell carcinoma. Key symptoms include vulvar itching (pruritus), burning, pain, or soreness. Visible changes may include raised or flat lesions on the vulvar skin that can appear white, red, brown, or darkly pigmented. Some patients may be asymptomatic, with the condition discovered incidentally during gynecological examination. The condition primarily affects the integumentary and reproductive systems. Treatment depends on the type, extent, and location of the lesions, as well as patient factors. Options include surgical excision (the most common approach), laser ablation (particularly CO2 laser vaporization), and topical medical therapies such as imiquimod cream, which stimulates a local immune response. Close long-term surveillance is essential because VIN can recur and, if left untreated, may progress to invasive vulvar cancer. The risk of progression to invasive carcinoma is estimated to be higher for differentiated VIN than for usual-type VIN. Multidisciplinary management involving gynecologic oncologists and dermatologists is often recommended.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

Common questions about Vulvar intraepithelial neoplasia