To determine whether TOMM20 can play a role in fibrosarcoma aggressiveness, we stably overexpressed TOMM20 (TOMM20 OE) and empty vector (Control EV) as a control in mouse fibrosarcoma cells MCA‐205 and verified TOMM20 overexpression in the mitochondria using immunofluorescence by labeling mitochondria with HSP‐60 and HA‐tagged TOMM20 with anti‐HA antibody and by western blot analysis (Fig. S3A,B). This evidence concerns the gene TOMM20 and fibrosarcoma.