C57BL/6J mice were acquired from The Jackson Laboratory. B6.Cg-Tg (Itgax-cre)1-1Reiz/J mice (CD11c-Cre; 008068; The Jackson Laboratory) were bred with Stat3f/f mice (Caton et al., 2007 (link); Takeda et al., 1998 (link)) to generate CD11c-Cre+Stat3f/f mice (Stat3Δ/Δ) and Cre-negative Stat3f/f littermate controls (termed herein, Stat3+/+). All mice were maintained in a specific pathogen–free animal facility at MD Anderson Cancer Center. Mice of both sexes were analyzed, ranging in age from 7 through 13 wk. Age- and sex-matched littermates were chosen randomly for inclusion in treatment groups and were used in accordance with MD Anderson Cancer Center Institutional Animal Care and Use Committee–approved protocols.