IHC4 score:
(ER, PR, Her2, Ki-67 IHC score)
Reference: Cuzick J, et al: Prognostic value of a combined estrogen receptor, progesterone receptor, ki-67, and human epidermal growth factor receptor 2 immunohistochemical score and comparison with the genomic health recurrence score in early breast cancer. J Clin Oncol 2011, 29(32):4273-4278.
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