Tissue-resident macrophages can self-maintain without contribution of adult hematopoiesis. Herein we show that tissue-resident interstitial macrophages (Res-TAMs) in mouse lungs contribute to the pool of tumor-associated macrophages (TAMs) together with CCR2-dependent recruited macrophages (MoD-TAMs). Res-TAMs largely correlated with tumor cell growth in vivo, while MoD-TAMs accumulation was associated with enhanced tumor spreading. Both cell subsets were depleted after chemotherapy, but MoD-TAMs rapidly recovered and performed phagocytosis-mediated tumor clearance. Interestingly, anti-VEGF treatment combined with chemotherapy inhibited both Res and Mod-TAM reconstitution without affecting monocyte infiltration and improved its efficacy. Our results reveal that the developmental origin of TAMs dictates their relative distribution, function, and response to cancer therapies in lung tumors.

METHODS. This randomized phase I/II clinical study (n = 60 healthy subjects aged 18-45 years old) used transcriptomic analysis to discover early biomarkers of immune response quality after transcutaneous (t.c.), intradermal (i.d.), and intramuscular (i.m.) administration of a trivalent influenza vaccine (TIV, season 2012-2013, 1:1:1 ratio). Safety and immunogenicity (hemagglutinin inhibition [HI], microneutralization [MN] antibodies, and CD4+ and CD8+ effector T cells) were measured at baseline day 0 (d0) and at d21. Blood transcriptome was analyzed at d0 and d1. RESULTS. TIV-specific CD8+ granzyme B+ (GRZ) T cells appeared in more individuals immunized by the t.c. and i.d. routes, whereas immunization by the i.d. and i.m. routes prompted high levels of HI antibody titers and MN against A/H1N1 and A/H3N2 influenza viral strains. The early innate gene signature anticipated immunological outcome by discriminating 2 clusters of individuals with either distinct humoral or CD8 cytotoxic responses. Several pathways explained this dichotomy and confirmed that 9 genes and the serum level of CXCL10 were correlated with either TIV-specific cytotoxic CD8+GRZ+ T cell or antibody responses. A logistic regression analysis demonstrated that these 9 genes and the serum levels of CXCL10 at d1/d0 best predicted TIV-specific CD8+GRZ+ T cell and antibody responses at d21. CONCLUSION. This study provides new insight into the impact of immunization routes and innate signature in the quality of adaptive immune responses. TRIAL REGISTRATION. This study has been registered at ClinicalTrials.gov (NCT01707602).