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Ki-67 Breast Cancer — SCE Medical Oncology MCQ

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EasyBreast CancerKi-67 Breast CancerSCE Medical Oncology

A 52-year-old woman with early breast cancer (pT1c N0 ER+/HER2-) has a Ki-67 of 35%. Her oncologist discusses the prognostic significance. What does high Ki-67 indicate?

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Correct answer: CHigh Ki-67 (>20-30%) indicates high tumour proliferation rate and is associated with higher recurrence risk and chemotherapy benefit

Ki-67 is a nuclear proliferation marker. High Ki-67 (>20-30%) correlates with higher recurrence risk and greater chemotherapy benefit in ER+/HER2- breast cancer. It is one of the factors in the St Gallen molecular subtype classification (Luminal A: low Ki-67; Luminal B: high Ki-67). While not included in Oncotype DX, Ki-67 ≥20% is one of the monarchE criteria for adjuvant abemaciclib eligibility.

Reference: https://www.nice.org.uk/guidance/conditions-and-diseases/cancer