Colorectal Cancer Screening With a Family History: The Daily PANCE Blueprint
A 38-year-old man presents for a routine health maintenance visit. He feels well and has no abdominal pain, rectal bleeding, or change in bowel habits. He has never had a colonoscopy. His father was diagnosed with colon cancer at age 46 and is alive after resection; no other relatives have had colorectal cancer or advanced polyps. He takes no medications, and his abdominal and rectal examinations are normal. Which of the following is the most appropriate colorectal cancer screening recommendation for this patient?
A. No colorectal cancer screening is indicated until age 45
B. Annual fecal immunochemical testing beginning at age 45
C. Colonoscopy beginning at age 40, repeated every 10 years
D. Colonoscopy now, repeated every 5 years
E. Colonoscopy beginning at age 48, repeated every 5 years
Answer and topic summary
The answer is D. Colonoscopy now, repeated every 5 years
A single first-degree relative with colorectal cancer diagnosed before age 60 moves this patient out of the average-risk pathway entirely. Per the ACG 2021 colorectal cancer screening guideline, screening in that setting begins at age 40, or 10 years before the age at which the youngest affected relative was diagnosed — whichever comes first — and is repeated every 5 years rather than every 10. Ten years before a diagnosis at 46 is age 36, which is earlier than 40, so at 38 he is already two years overdue and colonoscopy should be arranged now. Colonoscopy is preferred here because it both detects and removes the advanced adenomas this population develops earlier and faster.
The USPSTF (2021) start age of 45 — grade B for ages 45 to 49 and grade A for 50 to 75 — applies only to average-risk adults. Anchoring on 45 is the single most common error on this question type: a family history of early colorectal cancer overrides the average-risk start age. Waiting until 48, or screening at 40 on a 10-year interval, both get the arithmetic or the interval wrong.
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