title: Fibroepithelioma of Pinkus Revisited.
abstract: BACKGROUND
  Fibroepithelioma of Pinkus (FeP) is considered a variant of basal cell carcinoma (BCC); however, in the past 20 years, some researchers have argued for its classification as a trichoblastoma. Recently, use of a new immunostaining marker and further dermoscopic characterization of FeP have advanced the debate about its proper classification.
  
  
  OBJECTIVE
  A review of the evidence for and against classification of FeP as BCC or trichoblastoma is presented.
  
  
  METHODS
  Using PubMed, the term FeP was searched and relevant citations were assessed. Additional relevant articles were identified from references of key papers.
  
  
  RESULTS
  FeP shares characteristics of both trichoblastoma and BCC.
  
  
  CONCLUSIONS
  Derived from the same cell type, BCC and trichoblastoma may be best considered as representing opposite ends of a spectrum of differentiation, with FeP deserving an intermediate classification.
authors.affiliation: School of Medicine, University of California San Diego, San Diego, CA, USA. ehaddock@ucsd.edu.
authors.forename: Ellen S
authors.initials: ES
authors.lastname: Haddock
authors.affiliation: Department of Dermatology, University of California San Diego, San Diego, CA, USA.
authors.forename: Philip R
authors.initials: PR
authors.lastname: Cohen
keywords: Basal; Carcinoma; Cell; Fibroepithelioma; PHLDA1; Pinkus; Trichoblastoma; Trichoepithelioma