title: Predictive factors of proximal advanced neoplasia in the large bowel.
abstract: BACKGROUND
  The aim of the study was to evaluate the impact of sex, age, family history and distal findings on the risk of proximal advanced neoplasia (cancer or advanced adenoma) in the large bowel.
  
  
  METHODS
  Records for 10 111 asymptomatic participants of the Colonoscopy Screening Program (CSP), recruited from the Warsaw region between 2000 and 2004, were analyzed. A multivariate logistic regression model was used to estimate the impact of sex, age, family history and most advanced distal lesions on the occurrence of proximal advanced neoplasia. To enhance comparability of the study two definitions of the proximal colon were applied - either the splenic flexure (1(st)) or the bend between the descending and sigmoid colon (2(nd) definition) represented the boundary.
  
  
  RESULTS
  One hundred and thirty-three (1(st)) and 167 patients (2(nd) definition) were found to have at least one advanced neoplastic lesion in the proximal part, respectively. Eleven and 14 patients were found to have carcinoma, while in 130 and 163 patients at least one proximal advanced adenoma appeared. Men were at twice as high risk of having advanced neoplasia in the proximal colon than women (OR = 1.94, 95% CI: 1.31-2.87, p = 0.001 or OR = 1.69, 95% CI: 1.20-2.40, p = 0.003, respectively). The presence of distal advanced neoplastic lesions was associated with 3.5 times higher risk of proximal advanced neoplasia (OR = 3.58, 95% CI: 2.00-6.43, p < 0.0001 or OR = 3.41, 95% CI: 1.95-5.96, p < 0.0001), respectively.
  
  
  CONCLUSIONS
  The results may confirm some limitation of flexible sigmoidoscopy in the screening settings in comparison with colonoscopy, at least in men and people with distal advanced neoplasia.
authors.affiliation: Department of Gastroenterology and Hepatology, Medical Center for Postgraduate Education, Warsaw, Poland ; Department of Pathology, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland.
authors.forename: Miroslaw
authors.initials: M
authors.lastname: Kiedrowski
authors.affiliation: Department of Gastroenterology and Hepatology, Medical Center for Postgraduate Education, Warsaw, Poland ; Department of Pathology, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Mroz
authors.affiliation: Department of Gastroenterology, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland.
authors.forename: Michal F
authors.initials: MF
authors.lastname: Kaminski
authors.affiliation: Department of Gastroenterology and Hepatology, Medical Center for Postgraduate Education, Warsaw, Poland.
authors.forename: Ewa
authors.initials: E
authors.lastname: Kraszewska
authors.affiliation: Department of Pathology, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland.
authors.forename: Janina
authors.initials: J
authors.lastname: Orlowska
authors.affiliation: Department of Gastroenterology and Hepatology, Medical Center for Postgraduate Education, Warsaw, Poland ; Department of Gastroenterology, Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Warsaw, Poland.
authors.forename: Jaroslaw
authors.initials: J
authors.lastname: Regula
keywords: colonoscopy; colorectal cancer; flexible sigmoidoscopy; neoplasia; screening
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