Colon Cancer Screening in DFW

Colorectal cancer is the third most common cancer and the second leading cause of cancer death in the United States — yet it is one of the most preventable. With timely screening and polyp removal, the vast majority of colorectal cancers can be prevented or caught at a curable stage.

Why Colon Cancer Screening Matters

Most colorectal cancers begin as benign polyps that take 5–10 years to progress to cancer. Screening interrupts this timeline. Colonoscopy in particular is unique among cancer screening tests because it can detect AND remove precancerous lesions in a single procedure — making it both a screening and a prevention tool.

Equally important: colon cancer in adults under 50 has been rising approximately 1–2% per year for two decades. Dr. Ramani co-authored a 2022 Digestive Diseases and Sciences publication examining hepatocellular carcinoma–related mortality trends in the U.S. and is closely engaged with the broader literature on shifting GI cancer epidemiology.

When to Start Screening

Current guidelines from the American Cancer Society, the U.S. Preventive Services Task Force, and major GI societies:

• Average risk: begin at age 45
• 1st-degree relative with CRC or advanced polyp at age <60: begin at 40 or 10 years before the youngest affected relative — whichever is sooner
• African American patients: begin at 45, with a low threshold for symptom-driven evaluation earlier
• Inflammatory bowel disease (Crohn's, ulcerative colitis): begin surveillance 8 years after IBD diagnosis (or sooner with PSC)
• Lynch syndrome: begin at 20–25 with colonoscopy every 1–2 years
• FAP: begin in adolescence with annual sigmoidoscopy or colonoscopy

Screening Test Options

Colonoscopy

Most sensitive test, gold standard for prevention. Visualizes the entire colon, removes polyps, and biopsies suspicious lesions — all in a single procedure. Standard interval for average-risk adults: every 10 years if normal. Sedated, takes 20–30 minutes.

Cologuard (Multi-target Stool DNA)

Stool-based test that detects altered DNA and blood. Performed every 3 years. Sensitivity for cancer is high, but sensitivity for advanced polyps is lower than colonoscopy. A positive Cologuard requires a follow-up colonoscopy — and a positive Cologuard followed by a normal colonoscopy carries a known false-positive rate.

Fecal Immunochemical Test (FIT)

Annual stool test for occult blood. Lower cost, no prep, no sedation. Less sensitive for advanced adenomas than colonoscopy or Cologuard. Positive FIT requires colonoscopy.

CT Colonography

Imaging-based screening every 5 years. Requires similar bowel prep to colonoscopy. Cannot remove polyps — abnormal findings still require colonoscopy.

Flexible Sigmoidoscopy

Examines only the lower colon. Less commonly used in current U.S. practice given equivalent prep and superiority of full colonoscopy.

The Rising Tide of Early-Onset Colorectal Cancer

One of the most important shifts in modern GI: colorectal cancer in adults under 50 is rising globally. Likely contributors include:

• Obesity and metabolic syndrome
• Westernized diet high in ultra-processed foods and red/processed meat
• Microbiome alterations from antibiotic use, diet, and environmental exposures
• Sedentary lifestyle
• Possibly under-recognized hereditary syndromes

For patients in DFW under 50 with rectal bleeding, persistent change in bowel habits, unexplained iron-deficiency anemia, or unintended weight loss — do not assume hemorrhoids. Get evaluated.

Colon Cancer Screening: Common Questions