Carcinoma of the external ear

Area of Science:

• Dermatology
• Surgical Oncology
• Otolaryngology

Background:

• External ear carcinoma is a significant subset of skin cancer, particularly in populations with high sun exposure.
• Squamous-cell carcinoma (SCC) and basal-cell carcinoma (BCC) are the predominant types affecting the external ear.
• Understanding recurrence patterns and optimal surgical management is crucial for patient outcomes.

Purpose of the Study:

• To analyze the characteristics, recurrence rates, and survival outcomes of external ear carcinomas.
• To determine optimal surgical excision margins based on tumor type and size.
• To evaluate the efficacy of surgical treatment for these malignancies.

Main Methods:

• Retrospective analysis of 246 patients with 260 external ear carcinomas treated surgically between 1949-1957 and 1962-1967.
• Data collection included tumor type, site, size, recurrence, metastasis, and survival rates.
• Statistical analysis to correlate tumor characteristics with outcomes and determine recommended excision margins.

Main Results:

• Squamous-cell carcinomas (67%) and basal-cell carcinomas (30%) were the most common types, predominantly in elderly men with outdoor occupations.
• Recurrence rates were 15% for SCC (3% with lymph node metastasis) and 18% for BCC (no lymph node metastasis).
• Tumor size, not site, correlated with recurrence; 5-year survival without recurrence was 56% for SCC and 59% for BCC.

Conclusions:

• Surgical treatment is the preferred modality for external ear carcinomas.
• Recommended minimum excision distances are 8 mm for BCC <3 cm, 10 mm for SCC <3 cm, and 15 mm for tumors >3 cm.
• Adherence to appropriate surgical margins is essential for minimizing recurrence and improving survival rates.