Ultimately, we confirm that the UBC-GFP transgene integration site in our cohort maps to Chr 17 and posit rejection of syngeneic 4T1 tumor cells results from coinheritance of the C57BL/6 H-2b MHC locus with the UBC-GFP transgene in the commercially available backcrossed BALB/c transgenic. This evidence concerns the gene HLA-C and neoplasm.