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Serrated polyps: innocent or guilty?

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Serrated lesions, including hyperplastic polyps and adenomas, are precancerous colorectal growths. Recognizing serrated polyposis syndrome is crucial for managing high colorectal cancer risk through regular screening.

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Area of Science:

  • Gastroenterology
  • Oncology
  • Molecular Biology

Background:

  • Serrated lesions are a diverse group of precancerous colorectal growths with distinct genetic and biological features.
  • Three main types exist: hyperplastic polyps, sessile adenomas (with or without dysplasia), and traditional serrated adenomas.
  • These lesions are increasingly recognized as precursors to colorectal cancer.

Purpose of the Study:

  • To outline the carcinogenic pathway of serrated lesions.
  • To identify risk factors associated with serrated lesion development.
  • To define serrated polyposis syndrome (SPS) and its management implications.

Main Methods:

  • Review of the molecular mechanisms involved in serrated lesion carcinogenesis.
  • Analysis of environmental, lifestyle, and dietary risk factors.
  • Application of European Society for Gastrointestinal Endoscopy (ESGE) guidelines for SPS diagnosis.

Main Results:

  • The carcinogenic process involves MAPK-ERK pathway alterations, apoptosis inhibition, DNA hypermethylation, and microsatellite instability.
  • Risk factors include alcohol consumption, obesity, and low folate intake.
  • Serrated polyposis syndrome is diagnosed based on specific polyp counts and distribution criteria.

Conclusions:

  • Serrated lesions represent a significant precancerous pathway in colorectal carcinogenesis.
  • Lifestyle modifications and understanding risk factors are key to prevention.
  • SPS diagnosis necessitates regular colonoscopic screening for patients and their relatives due to high CRC risk.