title: Squamous cell carcinoma of the breast.
abstract: OBJECTIVE
  Pure squamous cell carcinoma (SCC) of the breast is a rare tumour and its clinical behaviour is not correctly known. The aim of the study is to evaluate the prevalence, epidemiological and clinical characteristics of the cases of SCC studied in our institution.
  
  
  METHODS
  The breast department's database was searched for patients diagnosed with breast SCC between September 1979 and June 2006. Pathological features, outcome aspects and prognosis were studied. All specimens were reviewed by our pathologist who performed inmunohistochemistry for hormone receptors.
  
  
  RESULTS
  Eleven patients were identified (0.19%) between 5771 cases of breast cancer. Mean age was 64 (37-76) years and mean follow-up was 46 (6-216) months. Mean disease free survival (DFS) was 92 months (S.E.=33), with a 36% DFS rate at 5 years and the mean overall survival was 93 months (S.E.=34). Mean survival from the time recurrent disease was recognized was 9 (1-16) months. Tumours were hormone receptor negative.
  
  
  CONCLUSIONS
  SCC of the breast is aggressive and often treatment-refractory. The role of different new chemotherapy regimens need to be explored.
authors.affiliation: Department of Obstetrics and Gynecology, University Hospital La Paz, Madrid, Spain. iaparicior@sego.es <iaparicior@sego.es>
authors.forename: I
authors.initials: I
authors.lastname: Aparicio
authors.forename: A
authors.initials: A
authors.lastname: Martínez
authors.forename: G
authors.initials: G
authors.lastname: Hernández
authors.forename: D
authors.initials: D
authors.lastname: Hardisson
authors.forename: J
authors.initials: J
authors.lastname: De Santiago
mesh_terms: D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000628:therapy*; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis* / Q000473:pathology / Q000628:therapy*; D017024:Chemotherapy, Adjuvant; D003131:Combined Modality Therapy; D005260:Female; D006801:Humans; D008408:Mastectomy; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000175:diagnosis; D015995:Prevalence; D011379:Prognosis; D018714:Radiotherapy, Adjuvant; D012189:Retrospective Studies; D016019:Survival Analysis; D016896:Treatment Outcome