The results of immunostainings for ER and PR were scored
semiquantitatively, independently by the 2 study pathologists
(A.I.K., O.A.O.) at the 2 study centers using 4-point scale of Reiner et al
[12]based on the intensity and percentage of IHC reaction. Regarding
staining with vimentin, V9 served as a control to monitor the quality of
tissuefixation in archival tumors[13