title: Metastatic eccrine porocarcinoma: a 5.6-year follow-up study of a patient treated with a combined therapeutic protocol.
abstract: BACKGROUND
  Metastatic eccrine porocarcinoma (EP) is an uncommon, malignant, and potentially lethal neoplasm that arises from the eccrine sweat glands.
  
  
  OBJECTIVE
  To present the 5.6-year follow-up study of a male patient with metastatic EP, highlighting the widespread cutaneous involvement and the response to the treatment carried out.
  
  
  METHODS
  We describe the evolution of the tumor and the combined therapy carried out and review the treatments employed in previously reported cases, comparing them with ours.
  
  
  RESULTS
  The patient developed multiple cutaneous and regional lymph node metastases 15 months after surgical excision of the primary tumor. He was treated with prophylactic lymphadenectomy, radiotherapy, and oral isotretinoin, subsequently substituted by tegafur. We have not found evidence of distant metastases after a 5.6-year follow-up.
  
  
  CONCLUSIONS
  The optimum treatment for metastatic EP is not standardized, and the results obtained to date were generally poor. In this context, we consider it of interest to highlight the response of our patient to the therapeutic regime employed, which may be advantageous in future cases of this rare tumor.
authors.affiliation: Department of Dermatology, Central University Hospital, University of Oviedo, C/Miguel de Unamuno no. 21, 3c, 33010 Oviedo, Spain.
authors.forename: Marcos A
authors.initials: MA
authors.lastname: González-López
authors.forename: Francisco
authors.initials: F
authors.lastname: Vázquez-López
authors.forename: Tomás
authors.initials: T
authors.lastname: Soler
authors.forename: Santiago
authors.initials: S
authors.lastname: Gómez-Diéz
authors.forename: Yolanda Hidalgo
authors.initials: YH
authors.lastname: Garcia
authors.forename: Jose A
authors.initials: JA
authors.lastname: Manjón
authors.forename: María
authors.initials: M
authors.lastname: López-Escobar
authors.forename: Narciso
authors.initials: N
authors.lastname: Pérez-Oliva
mesh_terms: D018250:Acrospiroma / Q000473:pathology* / Q000628:therapy*; D000368:Aged; D003131:Combined Modality Therapy; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D009362:Neoplasm Metastasis; D013544:Sweat Gland Neoplasms / Q000473:pathology* / Q000628:therapy*; D013997:Time Factors