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A MyBCTeam Member asked a question 💭
Sweden
August 11, 2025
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A MyBCTeam Member

Hello,
Antigen Kiel 67, also known as Ki-67 or MKI67, is a protein that in humans is encoded by the MKI67 gene. Antigen KI-67 is a nuclear protein that is associated with cellular proliferation and ribosomal…

Low
A Ki-67 level of 19% is considered low. Generally, levels below 20% are associated with a lower risk of cancer recurrence and are often used in clinical settings to guide treatment decisions. Lower Ki-67 levels suggest that cancer cells are dividing at a slower rate, which may indicate a more favorable prognosis.
Per Verywell Health

August 14, 2025
A MyBCTeam Member

Mine was 10 and I was already stage 4 but it did grow slowly for over 3 years

August 13, 2025
A MyBCTeam Member

Mine was 89

August 13, 2025
A MyBCTeam Member

Mine was 85%.

August 11, 2025
MyBCTeam

Ki-67 is a protein marker that indicates how quickly cancer cells are dividing and growing. A lower Ki-67 proliferation index generally suggests less aggressive cancer, while a higher percentage indicates more aggressive growth.

For breast cancer specifically, Ki-67 levels are typically considered
• Low: Less than 10%
Show Full Answer

Ki-67 is a protein marker that indicates how quickly cancer cells are dividing and growing. A lower Ki-67 proliferation index generally suggests less aggressive cancer, while a higher percentage indicates more aggressive growth.

For breast cancer specifically, Ki-67 levels are typically considered:
• Low: Less than 10%
• Intermediate: 10-20%
• High: Greater than 20%

At 19%, your Ki-67 level falls in the intermediate range, close to the high threshold. This information helps your doctors determine the best treatment approach for your specific case.

August 11, 2025

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