Our IHC analysis revealed that anti-myc signal was detected in breast tumor (B) of myc-PAK1 WT- and myc-PAK1 Y3F-inoculated mice (C) as well as in lung of myc-PAK1 WT-inoculated mice (D) but not in lungs of control GFP- (E) or PAK1 Y3F-inoculated mice (F). This evidence concerns the gene PAK1 and breast neoplasm.