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Bowel Symptoms in Relation to Colorectal Cancer

  • Barbara-Ann AdelsteinEmail author
  • Petra Macaskill
  • Peter H. Katelaris
  • Les Irwig
Chapter

Abstract

It is common in clinical practice to perform a colonoscopy in patients with symptoms, often with the aim of detecting or ruling out colorectal cancer. We present results from a systematic review and large primary clinical study that show that most bowel symptoms are not predictive of colorectal cancer. Considered individually, bowel symptoms that predicted colorectal cancer were rectal bleeding, change in bowel habit, rectal mucus and weight loss of more than 6 kg. Prediction was the strongest in those people who had symptoms weekly and of less than 12 months duration. When all bowel and general symptoms are considered together, only bleeding and rectal mucus remain predictive, and abdominal pain and anaemia become predictive.

A model based on age, gender and medical history was highly predictive. Age is a strong predictor of colorectal cancer, and consideration of symptoms adds little predictive value to that conferred by age alone. Therefore, with bowel symptoms being so common in the community, their role as a gatekeeper for access to colonoscopy needs review, especially in the context of other tests available—the predictive value of immunochemical faecal occult blood tests is also much higher than that of any symptom. Using a model based on age, medical history and symptoms the predicted probability of colorectal cancer can be assessed. In our study, 95% of cancers could have been detected by doing only 60% of the colonoscopies.

Keywords

Bowel symptoms Colorectal cancer Predictive value Colonoscopy Age 

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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  • Barbara-Ann Adelstein
    • 1
    Email author
  • Petra Macaskill
    • 2
  • Peter H. Katelaris
    • 3
  • Les Irwig
    • 2
  1. 1.Prince of Wales Clinical School, Faculty of MedicineUniversity of NSW (UNSW)SydneyAustralia
  2. 2.School of Public Health, Sydney Medical SchoolThe University of SydneySydneyAustralia
  3. 3.Gastroenterology Department, Concord HospitalSydney Medical School, The University of SydneySydneyAustralia

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