Colon Cancer Survival Rates by Stage: What the Numbers Mean
Colorectal cancer 5-year relative survival (SEER stages, ACS 2023 estimates):
| Stage | Description | 5-Year Relative Survival |
|---|
| Localized (I-II) | Confined to colon/rectum wall | 91% |
| Regional (III) | Spread to nearby lymph nodes | 72% |
| Distant (IV) | Metastatic (liver, lung, peritoneum) | 14% |
| All stages combined | | 64% |
Critical Modifiers
- Molecular subtype: MSI-H/dMMR (better prognosis, immunotherapy responsive); CMS4 (mesenchymal, worse).
- Treatment quality: NCCN-guideline adherence, high-volume centers, multidisciplinary tumor boards.
- Patient factors: Age, comorbidities, performance status, access to care.
- Sidedness: Right-sided (worse prognosis); left-sided (better response to anti-EGFR).
Screening Impact
- Colonoscopy detects precancerous adenomas; removal prevents cancer.
- Average-risk screening: start 45 (USPSTF); earlier with family history/Lynch/FAP.
- Stage shift: screening increases localized detection from ~40% to >60%.
Survivorship
Post-treatment: surveillance colonoscopy (1 yr, then 3-5 yr), CEA monitoring, CT, lifestyle (exercise, diet, aspirin per RCT), psychosocial support. Late effects: neuropathy, ostomy adaptation, fear of recurrence.
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