To clarify the role of USP19 in cancer cell suppression through regulation of BAG6 in vivo, MDA‐MB‐231 cells with expressed oeUSP19, oeUSP19/siBAG6, and control plasmids (Figure 5F), were subcutaneously injected into the right armpits of BALB/c nude mice (6 mice per group). This evidence concerns the gene USP19 and cancer.