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Hyperthermia has been a method for cancer treatment for several decades now because cancer cells are slightly more susceptible to hyperthermia than healthy cells. Unfortunately, whole body hyperthermia has prohibitive side effects limiting its use or usefulness. Local hyperthermia, directed only to tumor tissue, could alleviate this problem and prove to be a potent cancer treatment. One method of generating local hyperthermia is to deliver magnetic nanoparticles to the tumor site and then generate heat using an alternating magnetic field (AMF). Here we demonstrate a system that uses tumor homing cells to actively carry iron/iron oxide nanoparticles into tumor tissue for AMF treatment. Paramagnetic iron/iron oxide nanoparticles were synthesized that absorb and convert AMF energy into heat very efficiently. These nanoparticles were loaded into Raw264.7 cells (mouse monocyte/macrophage like cells, Mo/Ma), that we have previously shown to be tumor homing cells. Test showed that the nanoparticles loaded at high concentration in the cells with very low toxicity. To test the system, a murine pancreatic cancer model was generated by injection of Pan02 cells i.p. After tumor development, Mo/Ma loaded with iron/iron oxide nanoparticles were injected i.p. and allowed to crawl into the tumor. Three days after injection, mice were exposed to an alternative magnetic field for twenty minutes to cause the cell-delivered nanoparticles to generate heat. This treatment regimen was repeated three times. A survival study demonstrated that this system can significantly increase survival in a murine pancreatic cancer model, with an average post-diagnosis life expectancy increase of 33%. Thus, for the first time, a cell-delivered nanoparticle system for generating localized hyperthermia has been demonstrated that can significantly prolong the life of i.p. pancreatic tumor bearing mice. This system has the potential to become a useful method for specifically and actively delivering nanoparticles for local hyperthermia treatment of cancer. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 102nd Annual Meeting of the American Association for Cancer Research; 2011 Apr 2-6; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2011;71(8 Suppl):Abstract nr LB-205. doi:10.1158/1538-7445.AM2011-LB-205