What does no evidence of disease mean?
No evidence of disease, often shortened to NED, means that current examinations and tests have not found detectable cancer.
It describes what can be seen at that time. No scan or blood test can prove that there is not a single cancer cell anywhere in the body. The sensitivity of tests and the pattern of the cancer therefore matter.
NED can still be very encouraging. The caution is about what the words can guarantee, not an attempt to diminish a good result.
What does remission mean?
Remission means that the signs and symptoms of cancer have reduced.
- Partial remission means that the cancer has reduced but remains detectable.
- Complete remission means that all detectable signs of the cancer have disappeared according to the tests being used.
For some cancers, particularly blood cancers, remission has a specific definition based on blood counts, bone marrow findings or tests for measurable residual disease. The definition is therefore not identical across all cancers.
Complete remission may also be called a complete response. The article on complete response, partial response, stable disease and progressive disease explains scan-response terminology.
Does cancer-free mean cured?
“Cancer-free” is widely used in ordinary conversation, but it is not always a precisely defined clinical term. It may be used to mean NED or complete remission.
Cure means that the cancer will not return. That can be difficult to state with certainty immediately after treatment. The chance of recurrence often falls as more time passes, but the pattern differs by cancer type and stage.
Some clinicians use the word cured when the remaining risk has become very low. Others prefer to describe the current result and the ongoing follow-up. Neither choice of wording changes the underlying evidence.
Why can cancer recur after a clear scan?
Imaging can only detect disease above a certain size or in places visible to that test. Microscopic cells may occasionally remain after treatment without being detectable. Whether those cells exist, survive or grow cannot usually be known from one scan.
This is why some people receive additional treatment to reduce recurrence risk even when no cancer is visible, and why follow-up after treatment may continue.
How should I interpret the words in my letter?
Ask what the term refers to. It may describe one scan, the result after an operation, a blood or bone-marrow test, or the overall clinical assessment.
It is reasonable to ask:
- Which tests found no evidence of cancer?
- Is the term NED, remission or complete response being used formally?
- What is known about the chance and timing of recurrence?
- Is any further treatment recommended to reduce that risk?
- What follow-up is planned, and which symptoms should I report?
These terms can describe an excellent treatment result without being a universal guarantee. Their meaning becomes clearer when the team explains the tests, the cancer type and the purpose of follow-up.
