title: [Synchronous neoplastic lesions in colorectal cancer. An analysis of possible risk factors favouring presentation].
abstract: OBJECTIVE
  few data have been published regarding the causes of synchronous lesions in patients with colorectal cancer. The aim of our study was to identify potential factors that might be implicated in the development of multicentric lesions, since this knowledge could be useful for tailored follow-up once initial synchronous lesions have been removed.
  
  
  METHODS
  we retrospectively reviewed 382 colorectal cancer cases diagnosed by total colonoscopy and histological study of surgical specimens. We divided our population into 2 groups, based on whether they had synchronous lesions or otherwise. Several data related to personal and family history, habits, symptoms, and tumor characteristics were assessed. Univariate and multivariate statistical analyses were performed.
  
  
  RESULTS
  208 (54.5%) patients had synchronous adenomas and 28 (7.3%) had synchronous cancer. A multivariate analysis showed that the following parameters were consistently related to the presence of multicentric lesions--male gender: OR = 1.97; CI = 1.13-3.45; p = 0.017; age = 59 years: OR = 2.57; CI = 1.54-4.29; p < 0.001; personal history of colonic adenomas: OR = 3.04; CI = 1.04-8.85; p = 0.042; and obstructive tumors: OR = 0.48; CI = 0.27-0.85; p = 0.012.
  
  
  CONCLUSIONS
  our results show that several parameters that are easy to measure could be considered risk factors for the development of multicentric lesions. These factors need to be confirmed with follow-up studies analyzing their role in patients with and without metachronic lesions once all synchronous lesions have been removed.
authors.affiliation: Departamento de Digestivo, Clínica Universitaria de Navarra, Pamplona. aborda@unav.es
authors.forename: A
authors.initials: A
authors.lastname: Borda
authors.forename: J M
authors.initials: JM
authors.lastname: Martínez-Peñuela
authors.forename: M
authors.initials: M
authors.lastname: Muñoz-Navas
authors.forename: C
authors.initials: C
authors.lastname: Prieto
authors.forename: M
authors.initials: M
authors.lastname: Betés
authors.forename: F
authors.initials: F
authors.lastname: Borda
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015179:Colorectal Neoplasms / Q000453:epidemiology* / Q000209:etiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000453:epidemiology* / Q000209:etiology; D012189:Retrospective Studies; D012307:Risk Factors