Abstract 143: Immune landscape in lung adenocarcinoma drawn by single-cell RNA sequencing

Abstract

Immune cells in the tumor microenvironment from an ecosystem that modulates cancer progression. However, the exact nature and dynamics of tumor microenvironment in lung cancer remain largely unknown. To depict the baseline landscape of the composition of tumor microenvironment at different stages, we conduceted single-cell RNA sequencing of 58 samples from 43 lung adenocarcinoma patients. Here, we analyzed 11 early-stage lung tumor and normal pairs that had been resected before systemic therapy, 11 late-stage lung tumor biopsy, and 5 metastatic pleural-effusion or 10 metastatic brain tumor samples and revealed differential immune profiles encompassing lymphoid and myeloid compartment. In normal lung, large numbers of macrophages and T cells consistently comprised the immune cell repertoire across patients. In paired cancer tissues, decrease in macrophage but increase in B cell proportions were evident indicating the activation of humoral immunity. In addition, diverse effector T cell populations mark the cancer tissues both at the primary and metastatic sites, corroborating the activation of cellular adaptive immunity. These data provide valuable insight of tumor-driven immune changes in lung cancer. Citation Format: Bo Mi KU, Nayoung Kim, Kyung Young Lee, Jong-Mu Sun, Se-hoon Lee, Jin Seok Ahn, Keunchil Park, Hong Kwan Kim, Hae-Ock Lee, Myung-Ju Ahn. Immune landscape in lung adenocarcinoma drawn by single-cell RNA sequencing [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2019; 2019 Mar 29-Apr 3; Atlanta, GA. Philadelphia (PA): AACR; Cancer Res 2019;79(13 Suppl):Abstract nr 143.