Concordance of the IHC4 Score Performed in Local or Central Laboratory to Endopredict in ER+/HER2- Breast Cancer

"The IHC4 score is a prognostic tool that incorporates immunohistochemical parameters of ER (H-score), PR (% of positive cells), HER2 (positive or negative status), and Ki67 (% of positive cells).~IHC4 score, combined with nodal status and tumor grade, age, and the type of endocrine therapy (tamoxifen or aromatase inhibitors) provides a clinical score IHC4+C.~IHC4+C provides a prognostic risk of distant recurrence at 10 years for patients who underwent endocrine therapy for 5 years. IHC4+C defined three distinct risk categories:~* \<10%: low risk~* \[10-20%\]: intermediate risk~* \>20%: high risk"