377 IL-15 treatment enhances the in vivo anti-tumor efficacy of sipuleucel-T by activating CD8+ T and NKT effector cells, augmenting tumor infiltration, and reversing immunoresista... by Bo Peng, Tuyen Vu, Nadeem Sheikh, Russell Pachynski, Brian Van Tine, Todd Fehniger, Kevin Kim, Muhammad A Saeed, Ariel Borkowski, Daniel Thorek