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Proximal Aberrant Crypt Foci Associate with Synchronous Neoplasia and Are Primed for Neoplastic Progression.

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Aberrant crypt foci (ACF) are early colon lesions. Proximal ACF are more often dysplastic and linked to synchronous neoplasia, highlighting their role in colorectal cancer progression.

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Area of Science:

  • Gastroenterology
  • Oncology
  • Molecular Biology

Background:

  • Aberrant crypt foci (ACF) are the earliest identifiable colon lesions.
  • Limited research exists on proximal colon ACF molecular characteristics.

Purpose of the Study:

  • To investigate the molecular features of proximal colon ACF.
  • To determine the association between proximal ACF and synchronous neoplasia.

Main Methods:

  • High-definition chromoendoscopy with dye-spray was used to screen 184 participants for ACF.
  • Biopsies underwent laser capture microdissection (LCM) for somatic mutation analysis (APC, BRAF, KRAS, NRAS, ERBB2) and microsatellite instability (MSI) testing.
  • Logistic models assessed the link between proximal ACF and synchronous neoplasia.

Main Results:

  • 39% of participants had confirmed proximal ACF.
  • Proximal ACF presence significantly correlated with synchronous neoplasia (P=0.001), particularly proximal adenomas (OR=2.69).
  • Proximal ACF showed higher dysplasia rates (52%) than distal ACF (13%), and 37% harbored key somatic mutations.

Conclusions:

  • ACF are prevalent in the proximal colon and associated with synchronous adenomas.
  • Proximal ACF are frequently dysplastic and harbor mutations, supporting their role as early steps in the adenoma-carcinoma sequence.
  • ACF may be crucial early indicators of colorectal cancer risk, detectable before conventional endoscopy limits.