Immune Infiltration in Renal Cell Carcinoma.

Immune infiltration of tumours is closely associated with clinical outcome in renal cell carcinoma (RCC). Tumour-infiltrating immune cells (TIICs) regulate cancer progression and are appealing therapeutic targets. The purpose of this study was to determine the composition of TIICs in RCC and further reveal the independent prognostic values of TIICs. CIBERSORT, an established algorithm, was applied to estimate the proportions of 22 immune cell types based on gene expression profiles of 891 tumours. Cox regression was used to evaluate the association of TIICs and immune checkpoint modulators with overall survival (OS). We found that CD8+ T cells were associated with prolonged OS (hazard ratio [HR] = 0.09, 95% confidence interval [CI] 0.01-0.53; p = 0.03) in chromophobe carcinoma (KICH). A higher proportion of regulatory T cells was associated with a worse outcome (HR = 1.59, 95% CI 1.23-0.06; p < 0.01) in renal clear cell carcinoma (KIRC). In renal papillary cell carcinoma (KIRP), M1 macrophages was associated with a favorable outcome (HR = 0.43, 95% CI 0.25-0.72; p < 0.01), while M2 macrophages indicated a worse outcome (HR = 2.55, 95% CI 1.45-4.47; p < 0.01). Moreover, the immunomodulator molecules CTLA4 and LAG3 were associated with a poor prognosis in KIRC, and IDO1 and PD-L2 were associated with a poor prognosis in KIRP. This study indicates TIICs are important determinants of prognosis in RCC meanwhile reveals potential targets and biomarkers for immunotherapy development. This article is protected by copyright. All rights reserved.

Cancer science. 2019 Mar 12 [Epub ahead of print]

Shichao Zhang, Erdong Zhang, Jinhua Long, Zuquan Hu, Jian Peng, Lina Liu, Fuzhou Tang, Long Li, Yan Ouyang, Zhu Zeng

Immune Cells and Antibody Engineering Research Center of Guizhou Province/Key Laboratory of Biology and Medical Engineering, Guizhou Medical University, Guiyang, 550004, China., School of Life Sciences, Lanzhou University, Lanzhou, 730000, China., Affiliated Tumour Hospital, Guizhou Medical University, Guiyang, 550004, China., Department of Nephrology, The Third Affiliated Hospital of Guizhou Medical University Duyun, 558000, Guizhou Province, China.

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