Along the same line, the MUC1-expressing breast cancer cell lines MCF7 and T-47D also showed strong staining with anti-MUC1 Tn antibodies, while the MUC1 Tn-negative breast cancer cell line SK-BR-3 was only recognized by pan-MUC1 antibodies (Figure 1D). The gene discussed is MUC1; the disease is breast carcinoma.