Immuno-PET identifies the myeloid compartment as a key contributor to the outcome of the antitumor response under PD-1 blockade

Proceedings of the National Academy of Sciences of the United States of America
Mohammad RashidianHidde L Ploegh

Abstract

Immunotherapy using checkpoint-blocking antibodies against PD-1 has produced impressive results in a wide range of cancers. However, the response remains heterogeneous among patients. We used noninvasive immuno-positron emission tomography (PET), using 89Zr-labeled PEGylated single-domain antibody fragments (nanobodies or VHHs), to explore the dynamics and distribution of intratumoral CD8+ T cells and CD11b+ myeloid cells in response to anti-PD-1 treatment in the MC38 colorectal mouse adenocarcinoma model. Responding and nonresponding tumors showed consistent differences in the distribution of CD8+ and CD11b+ cells. Anti-PD-1 treatment mobilized CD8+ T cells from the tumor periphery to a more central location. Only those tumors fully infiltrated by CD8+ T cells went on to complete resolution. All tumors contained CD11b+ myeloid cells from the outset of treatment, with later recruitment of additional CD11b+ cells. As tumors grew, the distribution of intratumoral CD11b+ cells became more heterogeneous. Shrinkage of tumors in responders correlated with an increase in the CD11b+ population in the center of the tumors. The changes in distribution of CD8+ and CD11b+ cells, as assessed by PET, served as biomarkers to gauge the efficac...Continue Reading

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