Scientists at the University of Washington (UW) have recently developed a new nanoparticle-based drug delivery system that simultaneously delivers chemo- and immune- therapeutics directly to the tumor site, limiting harmful off-target side effects. In a paper published last November in Materials Today, they reported that their multifunctional nanoparticle can inhibit tumor growth and spread, also known as metastasis, in mouse models of triple negative breast cancer (TNBC), an exceptionally aggressive form of breast cancer with limited treatment options.