title: Frequency of facial basal cell carcinoma does not correlate with site-specific UV exposure.
abstract: BACKGROUND
  Basal cell carcinoma (BCC) is the most common type of skin cancer in whites. Long-term exposure to UV radiation is considered a major risk factor. We decided to investigate whether maximally exposed areas of the body are also the most frequent sites where BCCs develop.
  
  
  METHODS
  Retrospective analysis of distribution and histopathologic features of 3065 facial BCCs.
  
  
  METHODS
  University hospital.
  
  
  METHODS
  Patients with primary or recurrent BCC of the face.
  
  
  METHODS
  Exact topographic documentation followed by removal of BCC with Mohs prcedure and analysis of tumor extension.
  
  
  METHODS
  To test the hypothesis that site-specific UV exposure correlates with site-specific BCC frequency.
  
  
  RESULTS
  The most frequent sites of BCC were the nose (n = 1373), orbital area (n = 386), and ears (n = 269). Subdivision of these anatomical units showed that most nasal BCCs are located at the base of the nose (n = 851), while the apex (n = 292) and the dorsum of the nose (n = 230) were less frequent sites despite their prominent sun exposure. The shaded retroauricular fold (n = 99) and the sun-exposed preauricular crest (n = 105) were similar in frequency of BCCs; fewer BCCs were located on the helix of the ears (n = 65). Finally, almost 10 times more BCCs were found in the medial quadrant of the orbit (n = 225) than in the lateral quadrant (n=24). No correlation between prominent UV-exposed facial contours and particular histologic features, such as solid, morpheaform, or adenoid-cystic, could be established.
  
  
  CONCLUSIONS
  Site-specific cumulative UV exposure alone is a poor predictor of frequency or histologic features of BCC. Additional site-specific textural qualities of facial skin may be considered as potential cofactors for the development of BCC.
authors.affiliation: Department of Dermatology, Ludwig-Maximilians University, Munich, Germany. heckmann@derma.de
authors.forename: Marc
authors.initials: M
authors.lastname: Heckmann
authors.forename: Frank
authors.initials: F
authors.lastname: Zogelmeier
authors.forename: Birger
authors.initials: B
authors.lastname: Konz
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D001707:Biopsy, Needle; D002280:Basal Cell Carcinoma / Q000453:epidemiology* / Q000473:pathology*; D005260:Female; D005858:Germany / Q000453:epidemiology; D006801:Humans; D007150:Immunohistochemistry; D015994:Incidence; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D017678:Sex Distribution; D012878:Skin Neoplasms / Q000453:epidemiology* / Q000473:pathology*; D014466:Ultraviolet Rays / Q000009:adverse effects*