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NCIC CTG MA.12 Disease Free Survival by Standardized qPCR ER: Assay results are categorized by their z-scores (greater to or equal to 1 standard deviation (SD) below mean, less than 1 SD below the mean, less than or equal to 1 SD above the mean, and greater than 1 SD above the mean) or whether tumors under central review had no IHC assay staining. ER, estrogen receptor; IHC, immunohistochemistry.
