General Healthcare, Health

Colon Cancer Screening and Guidelines


Screening Recommendations:

  1. Age to Start: Most guidelines recommend starting regular screening at age 45 for people at average risk.
  2. Screening Methods:
    • Stool-Based Tests:
      • Fecal immunochemical test (FIT) annually
      • High-sensitivity guaiac-based fecal occult blood test (gFOBT) annually
      • Multi-targeted stool DNA test (MT-sDNA) every 3 years
    • Visual (Structural) Exams:
      • Colonoscopy every 10 years
      • CT colonography (virtual colonoscopy) every 5 years
      • Flexible sigmoidoscopy every 5 years
  3. High-Risk Individuals: Those with a family history of colorectal cancer, genetic predispositions (e.g., Lynch syndrome), or personal history of inflammatory bowel disease may need earlier and more frequent screening.

Symptoms of Colon Cancer

  • Early Stages:
    • Often asymptomatic
    • Occult (hidden) blood in the stool detected by screening tests
  • Advanced Stages:
    • Changes in bowel habits (diarrhea, constipation, or narrowing of the stool)
    • Persistent abdominal discomfort (cramps, gas, or pain)
    • Rectal bleeding or blood in the stool
    • Weakness or fatigue
    • Unexplained weight loss
    • Feeling that the bowel does not empty completely

Colon Cancer Statistics in the Past 3 Years

  • Prevalence:
    • An estimated 1.4% of Americans were living with colorectal cancer as of 2020, according to the National Cancer Institute.
  • Incidence:
    • Approximately 150,000 new cases of colorectal cancer are diagnosed each year in the U.S.
  • Survival Rates:
    • The 5-year relative survival rate for colorectal cancer varies based on the stage at diagnosis:
      • Localized (confined to the primary site): ~91%
      • Regional (spread to nearby lymph nodes): ~72%
      • Distant (metastasized): ~14%

Cure and Survival Rates After Treatment

  • Cure Rate:
    • When detected early (localized stage), the 5-year survival rate is around 91%.
    • The overall 5-year survival rate across all stages is approximately 64%.
  • Factors Affecting Survival:
    • Stage at diagnosis
    • Access to and quality of treatment
    • Patient’s overall health and comorbid conditions

Sources:

  1. American Cancer Society: Colorectal Cancer Screening Guidelines
  2. National Cancer Institute: Colorectal Cancer Statistics
  3. Centers for Disease Control and Prevention: Colorectal Cancer Facts & Statistics

-Nguyễn Duy Khiêm-