Hamartomatous Polyposis Syndromes

  • Joanne Ngeow
  • Eliza Courtney
  • Kiat Hon Lim
  • Charis Eng


The hamartomatous polyposis syndromes (HPS) include a small but appreciable number of the gastrointestinal hereditary cancer syndromes and are characterized by the presence of gastrointestinal (GI) hamartomatous polyps. Hamartomatous polyps account for a very small percentage of all GI polyps. They arise from excessive proliferation of the epithelial and stromal cells native to the tissue of origin and contain components from any of the three germ layers forming the intestines. The process underlying the progression of hamartomatous polyps to cancer is not fully understood. HPS occur at approximately one tenth of the frequency of adenomatous polyposis syndromes and account for less than 1% of colorectal cancer cases, although their prevalence may be higher than originally thought. It is now well recognized that these syndromes confer a substantial risk of colonic and extracolonic malignancies, therefore making it important to identify individuals with HPS for further risk management.


Cowden syndrome Juvenile polyposis Peutz-Jeghers syndrome PTEN Hamartomas Colorectal cancers Extra-colonic cancer risk 


Disclosure of Potential Conflict of Interest

No author had any relevant financial or personal relationships that could inappropriately influence or bias this work.


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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Joanne Ngeow
    • 1
    • 2
    • 3
  • Eliza Courtney
    • 1
  • Kiat Hon Lim
    • 4
  • Charis Eng
    • 3
    • 5
    • 6
    • 7
    • 8
  1. 1.Division of Medical OncologyNational Cancer CentreSingaporeSingapore
  2. 2.Oncology Academic Clinical Program, Duke-NUS Graduate Medical SchoolSingaporeSingapore
  3. 3.Genomic Medicine Institute, Cleveland ClinicClevelandUSA
  4. 4.Division of PathologySingapore General HospitalSingaporeSingapore
  5. 5.Lerner Research Institute, Cleveland ClinicClevelandUSA
  6. 6.Taussig Cancer Institute, Cleveland ClinicClevelandUSA
  7. 7.Department of Genetics and Genome Sciences, Case Western Reserve University School of MedicineClevelandUSA
  8. 8.Germline High Risk Focus Group, Case Comprehensive Cancer Center, Case Western Reserve UniversityClevelandUSA

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