title: A study of aspects on gender and prognosis in synchronous colorectal cancer.
abstract: OBJECTIVE
  To assess differences in demography, pathology and prognosis with tumor multiplicity in colorectal cancer.
  
  
  METHODS
  A retrospective single centre study of all patients surgically treated for a colorectal cancer during 1999-2008 (n = 2524). Patient characteristics, pathology and follow-up data were retrieved. Survival was assessed by overall and cancer specific survival.
  
  
  RESULTS
  60 (2.4%) patients had a synchronous cancer (SC), associated with right colon, higher age, more assessed lymph nodes but a lower frequency of stage III/IV disease (42% vs. 52%). There was no overall prognostic difference between single or multiple cancer patients but females with SC had better survival than corresponding males (P < 0.046).
  
  
  CONCLUSIONS
  The incidence of synchronous cancers was 2.4% with the second cancer often located in right colon. The SC patients were older than single tumor patients, had a lower frequency of stage III/IV disease and the females with SC had a better survival prognosis than corresponding males.
authors.affiliation: Sahlgrenska Academy, Department of Surgery, Sahlgrenska University Hospital, Östra 41685 Gothenburg, Sweden.
authors.forename: Kristoffer
authors.initials: K
authors.lastname: Derwinger
authors.forename: Bengt
authors.initials: B
authors.lastname: Gustavsson