Macroscopic aspect of tumor at right inguinal site from a Saline group animal, 8 weeks after xenograft, demonstrating intimate location of tumor within mammary fat pad, found in 100% tumors in this group (a). Macroscopic aspect of tumors and fat graft at right inguinal site from a Lipo group animal, 8 weeks after xenograft showing tumor and fat graft colocated with mammary fat pads, which was detected in 100% of subjects in this group (b); sample of tumor and fat graft after resection, illustrating deep adherence and the absence of a clear dissection plane between them, which happened in 43% of fat grafts (c).