Management of serrated adenomas and hyperplastic polyps

Area of Science:

• Gastroenterology
• Oncology
• Pathology

Background:

• Hyperplastic polyps share features with colorectal cancer precursors: sessile serrated adenomas (SSA), traditional serrated adenomas (TSA), and mixed polyps.
• These serrated polyps represent a distinct pathway to colorectal cancer, separate from the traditional adenoma-carcinoma sequence.
• Genetic mutations (BRAF, K-ras) in serrated polyps disrupt apoptosis, leading to characteristic atypia and crypt distortion.

Purpose of the Study:

• To review the histology and characteristics of serrated polyps.
• To discuss the implications of serrated polyps for treatment and surveillance strategies.
• To highlight the evolving understanding of the serrated pathway in colorectal carcinogenesis.

Main Methods:

• Histological review of serrated polyps, including SSA, TSA, and mixed types.
• Analysis of genetic mutations (BRAF, K-ras) associated with serrated polyps.
• Examination of current clinical management recommendations and surveillance guidelines.

Main Results:

• Serrated polyps exhibit unique histological features and molecular alterations, including defects in apoptosis.
• These lesions possess the potential for malignant transformation into colorectal carcinoma via the serrated pathway.
• Current management aligns with conventional adenomas, but evidence-based algorithms are still under development.

Conclusions:

• Serrated polyps, particularly SSAs, are significant precursors to colorectal cancer through a distinct molecular pathway.
• Accurate histological identification and understanding of serrated polyp characteristics are crucial for appropriate management.
• Further research is needed to establish definitive evidence-based guidelines for the clinical management and surveillance of serrated polyps.