TGFB1 and neoplasm: The combination of a polymeric‐liposomal gel system with TGF‐β inhibitor has been also found to stimulate the activity of natural killer (NK) cells against different cancer types and to increase immune response.[112] Saeid et al. further demonstrated that the FDA‐approved ferumoxytol nanomicelle iron supplement can suppress tumor growth by stimulating pro‐inflammatory macrophage polarization at tumor sites.[113]