As depicted in Figure 2 (panels A and B), normal mammary gland tissue did not express detectable level of CXCR4, while epithelial cells of basaloid adenoma appeared weakly positive for CXCR4 (CXCR4 score 1+, Figure 2 panel C) in scattered areas throughout the section, and the complex adenoma was essentially negative (CXCR4 score 0, Figure 2 panel D). The gene discussed is CXCR4; the disease is adenoma.