title: Cryptogenic pyogenic liver abscess as a sign of colorectal cancer: a population-based 5-year follow-up study.
abstract: OBJECTIVE
  No large-scale population-based study has ever been conducted to examine the relationship between cryptogenic pyogenic liver abscesses (PLA) and the subsequent risk of colorectal cancer. This study aimed to estimate the risk for colorectal cancer following a diagnosis of cryptogenic PLA over a 5-year period.
  
  
  METHODS
  The study group comprised 274 patients who visited an outpatient care centre or were hospitalized with a diagnosis of cryptogenic PLA between 2001 and 2003. The comparison group included 1370 randomly selected subjects. Cox proportional hazard regressions were performed to compare the 5-year colorectal cancer-free survival rates for these two groups.
  
  
  RESULTS
  Of the total sample, 40 patients from the study group (2.43%) had colorectal cancer during the 5-year follow-up period: 15 (5.45% of those with cryptogenic PLA) and 25 from the comparison group (1.82% of the comparison group). After adjusting for patients' age, sex, monthly income, level of urbanization and geographical location, the hazard of colorectal cancer during the 5-year period was 3.36 times greater for patients with cryptogenic PLA than for the comparison group [95% confidence interval (CI)=1.72-6.56, P<0.001]. The adjusted hazard of colorectal cancer during the 5-year follow-up period was 5.54 times higher for cryptogetic PLA patients with diabetes (95% CI=2.11-14.56, P<0.001) than the comparison group and 2.64 times higher among PLA patients without diabetes (95% CI=1.19-5.85, P<0.05).
  
  
  CONCLUSIONS
  We conclude that cryptogenic PLA is an alarm that may signal colorectal cancer, especially among female patients with diabetes.
authors: Department of Internal Medicine, Division of Gastroenterology, China Medical University Hospital, Taichung, Taiwan.
authors: Hsueh-Chou
authors: HC
authors: Lai
authors: Herng-Ching
authors: HC
authors: Lin
mesh_terms: D000328:Adult; D000368:Aged; D015179:Colorectal Neoplasms / Q000150:complications / Q000453:epidemiology / Q000473:pathology*; D015897:Comorbidity; D003710:Demography; D048909:Diabetes Complications; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D046290:Liver Abscess, Pyogenic / Q000453:epidemiology / Q000209:etiology / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D011159:Population Surveillance; D016016:Proportional Hazards Models; D012307:Risk Factors; D012959:Socioeconomic Factors