MUC1 and neoplasm: Similar to Muc1-Bi-1, Muc1-Bi-2 exhibited no cell killing for Muc1 negative CHO cells (Figs 3A and 4A and 5A), but potent immune cell dependent cell killing against Muc1 positive tumor cells (Figs 3B and 3C and 3D and 4B and 4C and 4D and 5B and 5C and 5D).