The remaining three viruses, called rAPMV-2 (type 1 Africa), rAPMV-4/Fcs-BC, and rAPMV-7/Fcs-5B, were versions of wt rAPMV-2, -4, and -7, respectively, in which the naturally-occurring non-multi-basic F cleavage site was modified into a multi-basic site containing the optimal furin motif (Table 1). This evidence concerns the gene FURIN and breast cancer.