MKI67 and breast cancer: A metaanalysis confirmed that high Ki‐67 expression in patients with early‐stage breast cancer confers a worse prognosis in the overall population.(24) Another study reported a correlation between the perfusion parameters and various prognostic factors and also with immunohistochemical subtypes of breast cancer.(25) The authors observed that a higher Ktrans was correlated with Ki‐67 positivity, and a higher kep with CK5/6 negativity and Ki‐67 positivity.