Jab1 nuclear expression correlates with increased EGFR and S100A7 in breast tumors. EGFR, S100A7, and Jab1 were detected by immunohistochemistry in breast tumors represented within a tissue microarray. Representative staining is shown for all three markers and in three separate tumors. Tumor #188 (top row) shows high nuclear Jab1 expression associated with high EGFR and S100A7 expression. Tumor #226 (middle row) shows intermediate nuclear and cytoplasmic Jab1 expression associated with moderate EGFR and absence of S100A7 expression. Tumor #230 (bottom row) shows low nuclear but high cytoplasmic Jab1 expression associated with the absence of EGFR or S100A7 expression. EGFR, epidermal growth factor receptor; Jab1, c-Jun activation domain-binding protein-1.