Description 
The mouse Muc1 gene was replaced by human MUC1 coding sequence in B-hMUC1 MC38 cells. Human MUC1 is highly expressed on the surface of B-hMUC1 MC38 cells.
Application
B-hMUC1 MC38 cells have the capability to establish tumors in vivo and can be used for efficacy studies. It should be noted that B-hMUC1 MC38 cells can grow on B-hMUC1 mice, but can’t grow on wild-type C57BL/6 mice, which is consistent with the literature report.
Targeting strategy
Gene targeting strategy for B-hMUC1 MC38 cells. The exogenous promoter and human MUC1 coding sequence was inserted to replace murine exon 1~7. The insertion disrupts the endogenous murine MUC1 gene, resulting in a non-functional transcript.
Protein expression analysis 

Tumor growth curve & Body weight changes

Protein expression analysis of tumor cells

B-hMUC1 MC38 cells were subcutaneously transplanted into B-hMUC1 mice (n=6), and on 31 days post inoculation, tumor cells were harvested and assessed for human MUC1 expression by flow cytometry. As shown, human MUC1 was highly expressed on the surface of tumor cells. Therefore, B-hMUC1 MC38 cells can be used for in vivo efficacy studies of novel MUC1 therapeutics.