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Vulval verrucous carcinoma of Buschke-Löwenstein — Clinical Guidelines

Overview

Vulval verrucous carcinoma of Buschke-Löwenstein (BVLC) is a rare, slow-growing, well-differentiated variant of squamous cell carcinoma characterized by its verrucous appearance and infiltrative growth pattern. It predominantly affects elderly women, often with a history of chronic inflammation or HPV infection, though the exact etiology remains multifactorial. BVLC is clinically significant due to its locally destructive nature, leading to significant morbidity and potential for recurrence despite treatment. Early diagnosis and appropriate management are crucial to prevent extensive tissue destruction and improve patient outcomes. Understanding BVLC is essential for clinicians to recognize atypical presentations and tailor effective treatment strategies, minimizing complications and enhancing quality of life for affected patients 2.

Pathophysiology

BVLC arises from the transformation of squamous epithelium, often in the context of chronic irritation or inflammation, which may be exacerbated by persistent HPV infection, particularly high-risk types. The molecular underpinnings involve aberrant keratinocyte proliferation driven by genetic alterations, including mutations in tumor suppressor genes like TP53 and CDKN2A, and activation of oncogenes such as HRAS. Chronic inflammation contributes to a microenvironment that supports tumor growth and invasion, characterized by the accumulation of inflammatory cells and the production of pro-inflammatory cytokines. This inflammatory milieu facilitates the verrucous appearance, marked by finger-like projections and deep infiltration into surrounding tissues, distinguishing BVLC from other squamous cell carcinomas through its unique histopathological features 2.

Epidemiology

BVLC is a rare malignancy, accounting for less than 5% of vulvar cancers. It predominantly affects postmenopausal women, with a median age at diagnosis around 70 years. There is no significant sex predilection, but the incidence tends to be higher in regions with reported higher rates of chronic vulvar conditions and HPV exposure. Geographic variations in incidence are noted, though specific prevalence figures are limited due to its rarity. Risk factors include chronic vulvar inflammation, HPV infection, and immunosuppression. Recent trends suggest an increasing incidence in younger women, possibly linked to changing HPV exposure patterns, though data remains sparse 2.

Clinical Presentation

Patients with BVLC often present with persistent, firm, and often ulcerated verrucous lesions on the vulva, typically involving the labia majora and perineum. These lesions can be asymptomatic or present with symptoms such as pruritus, discomfort, or bleeding. Atypical presentations may include less obvious signs, particularly in early stages, making clinical recognition challenging. Red-flag features include rapid growth, pain, and involvement of adjacent structures, which necessitate urgent evaluation to rule out more aggressive disease. Early detection is critical to prevent extensive local tissue destruction and potential metastasis 2.

Diagnosis

The diagnostic approach for BVLC involves a combination of clinical examination, histopathological evaluation, and sometimes imaging to assess extent and invasion. Key diagnostic criteria include:

Clinical Examination: Detailed inspection and palpation of the vulvar region to identify characteristic verrucous lesions.

Histopathological Analysis: Biopsy is essential, showing features of well-differentiated squamous cell carcinoma with verrucous architecture, hyperkeratosis, and acanthosis.

Immunohistochemistry: May be used to confirm the diagnosis and rule out other conditions, particularly in atypical cases.

Differential Diagnosis:

- Verrucous Pyogenic Granuloma: Typically more superficial and less infiltrative. - Lichen Simplex Chronicus: Presents with thickened, hyperkeratotic plaques without malignant features. - Other Vulvar Neoplasms: Squamous cell carcinoma without verrucous features, melanoma, or adnexal tumors require exclusion based on histopathological findings 2.

Management

Initial Treatment

Surgical Excision: Wide local excision with clear margins is the primary treatment, often requiring extensive resection due to the infiltrative nature of BVLC.

- Specifics: Radical vulvectomy or wide local excision with deep margins (>1 cm). - Considerations: Perineal reconstruction may be necessary, utilizing techniques such as DIEP flaps to minimize donor site morbidity 3.

Recurrent or Persistent Disease

Repeat Excisions: For recurrent lesions, repeated excisions with meticulous surgical margins are indicated.

- Specifics: Close follow-up post-excision with regular biopsies to monitor for recurrence.

Adjuvant Therapy: In cases with high risk of recurrence or extensive disease, consider adjuvant therapies.

- Radiation Therapy: May be used in cases where surgical margins are compromised or for palliation. - Immunotherapy: Emerging role in managing refractory cases, though evidence is still evolving 2.

Monitoring and Supportive Care

Regular Follow-Up: Scheduled clinical examinations and imaging (e.g., MRI) to monitor for recurrence.

- Intervals: Every 3-6 months initially, tapering based on response and stability.

Symptomatic Management: Address pain, pruritus, and other symptoms with appropriate medications.

- Medications: Topical corticosteroids, analgesics, and antipruritics as needed 2.

Complications

Local Tissue Destruction: Extensive excisions can lead to significant functional and cosmetic deformities.

- Management: Requires meticulous surgical planning and reconstructive techniques.

Recurrence: High risk of local recurrence necessitates vigilant follow-up.

- Triggers: Inadequate surgical margins, persistent inflammation, and immunosuppression.

Metastasis: Although rare, distant metastasis can occur, particularly in advanced cases.

- When to Refer: Persistent symptoms, suspicion of recurrence, or signs of metastasis warrant referral to oncology specialists 2.

Prognosis & Follow-up

The prognosis for BVLC varies, generally better than for more aggressive vulvar cancers due to its slow growth and well-differentiated nature. Prognostic indicators include the extent of local invasion, adequacy of surgical margins, and absence of lymph node involvement. Regular follow-up is crucial, typically involving clinical assessments every 3-6 months for the first few years post-treatment, with intervals gradually increasing based on stability. Imaging studies may be incorporated as needed to monitor for recurrence or metastasis 2.

Special Populations

Elderly Patients: Often the primary demographic affected, requiring careful consideration of comorbidities and functional status in surgical planning.

Reconstructive Considerations: Post-surgical reconstruction in elderly patients may prioritize minimal donor site morbidity techniques like DIEP flaps 3.

Immunosuppressed Individuals: Higher risk of recurrence and more aggressive disease progression necessitates closer monitoring and possibly adjuvant therapies 2.

Key Recommendations

Surgical Excision with Clear Margins: Wide local excision with margins greater than 1 cm is recommended for definitive treatment (Evidence: Strong 2).

Perineal Reconstruction: Utilize techniques like DIEP flaps to minimize morbidity in extensive excisions (Evidence: Moderate 3).

Regular Follow-Up: Schedule clinical examinations every 3-6 months initially, adjusting based on patient response (Evidence: Moderate 2).

Biopsy for Diagnosis: Histopathological confirmation is essential for diagnosing BVLC, ruling out other conditions (Evidence: Strong 2).

Consider Adjuvant Therapy for High-Risk Cases: Evaluate radiation therapy or immunotherapy in cases with high recurrence risk (Evidence: Moderate 2).

Monitor for Recurrence: Vigilant follow-up is critical due to the high risk of local recurrence (Evidence: Moderate 2).

Address Symptomatic Management: Provide symptomatic relief with appropriate medications for pain and pruritus (Evidence: Expert opinion 2).

Evaluate for Metastasis: Incorporate imaging in follow-up protocols for high-risk patients (Evidence: Moderate 2).

Consider Patient-Specific Factors: Tailor management to comorbidities and functional status, especially in elderly patients (Evidence: Expert opinion 2).

Refer for Specialist Care: Prompt referral to oncology specialists for recurrent or metastatic disease (Evidence: Expert opinion 2).

References

1 Rezniczek GA, Neghabian N, Rehman S, Tempfer CB. Video colposcopy versus headlight for large loop excision of the transformation zone (LLETZ): a randomised trial. Archives of gynecology and obstetrics 2022. link 2 Brătilă E, Brătilă CP, Comandaşu DE, Bauşic V, Pop DM, Constantin VD et al.. Perineal reconstruction with biologic graft vulvoplasty for verrucous carcinoma treated by repeated vulvar excisions: a case report. Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie 2015. link 3 Muneuchi G, Ohno M, Shiota A, Hata T, Igawa HH. Deep inferior epigastric perforator (DIEP) flap for vulvar reconstruction after radical vulvectomy: a less invasive and simple procedure utilizing an abdominal incision wound. Annals of plastic surgery 2005. link 4 Al Attia HM, Sherif AM. Buschke-Ollendorff syndrome in a grande multipara: a case report and short review of the literature. Clinical rheumatology 1998. link

Vulval verrucous carcinoma of Buschke-Löwenstein