Vulvar Cancer Causes and Risk Factors

Vulvar cancer is a rare gynecological malignancy that forms on the external genitalia, most frequently developing on the labia majora or labia minora. While it is less common than other reproductive cancers, its development is deeply tied to either persistent viral infections or chronic skin inflammation. Understanding these underlying biological pathways is the first step in recognizing symptoms early and taking proactive control of your health.

What Causes Vulvar Cancer?

Vulvar cancer occurs when the DNA inside the squamous skin cells of the vulva mutates, disrupting the signals that govern normal cell life cycles. Instead of growing and dying in an orderly fashion, these mutated cells multiply rapidly and survive past their natural lifespan, eventually clustering together to form a localized tumor.

Clinical research has revealed that this genetic damage typically follows one of two completely separate biological pathways:

• The HPV-dependent pathway: In this scenario, high-risk strains of the Human Papillomavirus (such as the basaloid and warty subtypes) infect the vulvar tissue. If the body cannot clear the virus, HPV integrates its own genetic code into the healthy cells, producing viral proteins that shut down the body's natural tumor-suppressor pathways. This pathway is most common in younger individuals and is heavily accelerated by tobacco use.
• The HPV-independent (p53 mutation) pathway: This pathway occurs entirely free of viral infection, typically in women over the age of 55. It is usually the result of decades of chronic, severe skin inflammation (such as lichen sclerosus). Over time, the constant tissue damage and cellular turnover cause a spontaneous mutation in the p53 gene, the master gene responsible for correcting DNA mistakes. Without a functioning p53 gene, abnormal cells are allowed to replicate freely, eventually turning into a malignancy.

Vulvar cancer risk factors

Because vulvar cancer lacks a routine screening tool like a Pap smear, mapping your individual risk profile is primarily about personal vigilance. Possessing one or more of these variables is never a guarantee of a future diagnosis, but rather, it simply indicates whether your ongoing gynecological care should focus on tracking long-term viral exposure or managing chronic external skin irritation.

Non-modifiable Vulvar Cancer Risk Factors

Most documented risk factors for vulvar cancer are entirely unchangeable, stemming from natural aging, underlying genetics, or unavoidable chronic skin conditions. These include:

• Advanced age: While it can develop at any age, the risk of developing vulvar cancer increases as you get older. The average age at the time of a clinical diagnosis is 65.
• Persistent HPV infection: Exposure to high-risk strains of the Human Papillomavirus is the single most common driver of vulvar malignancies in younger demographics.
• Immune system health: Living with HIV or active AIDS weakens the body’s immune system. A compromised immune system struggles to identify and destroy abnormal cells, making it much harder for the body to fight off the persistent HPV infections that drive the disease.
• Precancerous conditions (VIN): Having a history of vulvar intraepithelial neoplasia (VIN) or cervical dysplasia significantly increases your risk. A small percentage of these precancerous cellular changes will gradually turn into invasive, deep-tissue cancer if they are not clinically removed or treated.
• Chronic vulvar inflammation: Long-standing inflammatory skin conditions that affect the external genitalia, such as lichen sclerosus, lichen planus, or Paget’s disease, cause permanent cellular stress. This continuous tissue irritation can trigger the spontaneous genetic mutations that lead to tumors.

Modifiable Vulvar Cancer Risk Factors

Unlike many common cancers, vulvar cancer has a very limited connection to everyday lifestyle choices. Standard health habits, such as your diet, exercise routine, or weight management, do not appear to influence your baseline risk for developing these tumors.

For this reason, only a few daily lifestyle changes can actively alter your risk profile. While general behaviors do not play a primary role, clinical research has directly linked two specific habits to an increased risk of vulvar squamous cell carcinoma:

• Tobacco use: Smoking introduces potent carcinogens into your bloodstream that accelerate cellular damage in the vulvar tissue. This doubles the statistical risk of developing vulvar cancer and makes it much harder for your immune system to clear an underlying HPV infection.
• Excessive alcohol consumption: Regular, heavy alcohol use acts as a systemic stressor that can impair immune surveillance, leaving vulnerable external tissues more susceptible to persistent viral mutations.

Because you cannot prevent these tumors entirely through lifestyle changes, your best approach is to minimize these behavioral risks while remaining highly vigilant about any unusual physical changes.

Can Vulvar Cancer be Prevented?

While there is no definitive way to completely prevent vulvar cancer, especially when risks are tied to unchangeable factors like aging or chronic skin conditions, you can drastically lower your baseline risk. Proactive medical care and targeted lifestyle choices work together to stop abnormal cellular changes before they can turn into invasive tumors.

The most effective prevention strategies include:

• Scheduling regular gynecological examinations: Because there is no standard screening test specifically designed for the vulva, a comprehensive annual physical exam by a specialist remains your best defense for detecting cellular shifts early.
• Receiving the HPV vaccine: Protecting yourself against high-risk viral strains cuts off the primary biological catalyst behind the vast majority of vulvar malignancies diagnosed in younger adults.
• Quitting tobacco use: If you smoke, quitting is one of the most impactful choices you can make for your reproductive health. Eliminating commercial tobacco stops the continuous flow of tissue-damaging carcinogens into your bloodstream and immediately restores your immune system's natural capacity to clear out localized infections.

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Frequently asked questions (FAQs) about vulvar cancer causes and risk factors

If you have been diagnosed with vulvar cancer, you may want to take steps to educate yourself. Learning about your cancer and treatment options can alleviate some of the initial anxiety you may be experiencing. Moffitt Cancer Center is committed to providing our patients with the information they need to make fully informed treatment decisions with confidence. Toward that end, we have included the following article as a reliable source of information relating to a FAQ about vulvar cancer causes:

• Can HPV Cause Vulvar Cancer?

Benefit from world-class care at Moffitt Cancer Center

The scientists at Moffitt are nationally recognized for their extensive research and groundbreaking discoveries, which continue to transform the field of cancer care. Each day, we gain more ground in understanding what causes healthy cells to become cancerous and, when they do, the most effective ways to treat the resulting cancer. A recipient of the prestigious designation of Comprehensive Cancer Center from the National Cancer Institute, Moffitt consistently achieves patient outcomes that exceed national averages, and we ensure that our patients have the best possible quality of life. Through our robust clinical trials program, we offer our patients unique opportunities to be among the first to benefit from promising new treatments that are not yet available elsewhere. 

The multispecialty team in Moffitt’s gynecological clinic helps many women understand their risk of developing vulvar cancer and their options for risk reduction, early detection and treatment. Our patients can receive advice, treatment, support and multiple expert opinions in a single location.

If you would like to learn more about vulvar cancer causes and risk factors, an expert in our Gynecologic Oncology Program can provide detailed information and create an individualized risk profile for you. To request an appointment, call 1-888-663-3488 or submit a new patient registration form online. No referral is necessary.