The short answer
Remission means cancer signs and symptoms have decreased or disappeared. No Evidence of Disease (NED) means current scans and blood tests show no detectable cancer. Doctors prefer these terms over 'cured' because microscopic cells below imaging limits may still exist.
Complete Remission and NED mean no cancer is currently detectable on tests.
Partial Remission means the tumor has shrunk significantly but is still visible.
Doctors avoid the word 'cured' because scans cannot detect individual microscopic cells.
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The full explanation.
Immediate Answer
While everyday conversation uses the phrase "cancer-free," oncologists rely on precise medical terminology:
- Complete Remission: All signs and symptoms of cancer have disappeared on exams and lab tests.
- No Evidence of Disease (NED): Scans, physical exams, and blood tests show no detectable cancer cells.
- Partial Remission: The cancer has decreased in size or extent by at least 50%, but some disease remains visible.
Doctors prefer remission or NED over "cured" because scans cannot detect microscopic individual cells.
Terminology Comparison Table
| Term | What It Means | What It Does NOT Mean | Why Doctors Use It |
|---|---|---|---|
| Complete Remission | All detectable signs of cancer are gone. | Does not guarantee that zero microscopic cells exist. | Reflects complete treatment response based on available tests. |
| No Evidence of Disease (NED) | Diagnostic scans (CT/PET) and blood tests show no tumor. | Does not mean surveillance scans can stop immediately. | Precise description of current imaging and lab findings. |
| Partial Remission | Tumor volume shrunk by $\ge 50%$. | Does not mean treatment failed; it shows active disease control. | Used to guide whether treatment should continue. |
| Stable Disease | Tumor size has neither grown nor significantly shrunk. | Does not mean cancer is worsening; staying stable is often a goal. | Describes successful control in many advanced cancers. |
Why Don't Doctors Say "Cured"?
Diagnostic tools (CT, MRI, PET scans) have resolution limits. A scan can detect a tumor cluster of a few millimeters, but cannot detect a single microscopic cell.
Because microscopic dormant cells can potentially reactivate months or years later, oncologists use NED or complete remission and recommend periodic surveillance checkups to verify long-term health.
Words to know
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Common questions
Is No Evidence of Disease (NED) the same as being cured?
NED means all current tests, scans, and physical exams show no sign of cancer. Doctors use 'NED' rather than 'cured' because current technology cannot detect microscopic cancer cells that might remain dormant.
Questions to ask your doctor
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Your next step
Plain-language guides to pathology and scan terms.
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