Colon Cancer: A Clinician's Perspective in 2019

Area of Science:

• Gastroenterology and Oncology
• Cancer Prevention and Early Detection
• Molecular Biology and Genetics

Background:

• Colorectal cancer (CRC) screening has decreased incidence and mortality in developed nations.
• However, CRC rates are increasing in adults under 50, highlighting a critical public health concern.
• Disparities exist in screening benefits, particularly between right-sided and left-sided colon cancers.

Purpose of the Study:

• To review current understanding of colon cancer development, screening guidelines, and management strategies.
• To address the rising incidence of colorectal cancer in younger populations.
• To discuss advancements in early detection, quality metrics, and treatment for colorectal cancer.

Main Methods:

• Review of current literature on colon cancer epidemiology, genetics, and screening modalities.
• Analysis of screening guidelines from major medical societies (e.g., MSTF, ACP, ACS).
• Evaluation of diagnostic tools, quality indicators (e.g., adenoma detection rate, Boston bowel preparation scale), and therapeutic options.

Main Results:

• Colonoscopy remains the gold standard for CRC screening, with adenoma detection rate as a key quality metric.
• Contrasting screening age recommendations exist (e.g., ACS recommends 45 years for all).
• Low-volume split-dose bowel preparation is effective and better tolerated.
• Checkpoint inhibitors show promise for dMMR/MSI-H metastatic CRC.
• Ongoing research focuses on genetic mutations, microsatellite instability, and immune-oncology.

Conclusions:

• Early-stage CRC is curable; advanced stages require palliative treatments.
• Accurate staging, including lymph node assessment, is crucial for effective CRC management.
• Advances in immunotherapy and ongoing research offer hope for improved CRC detection and treatment.