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Cyclin D1 (CCND1)  amplification relevant to malignant biological behavior exists in solid tumors. The prevalence and utility of  CCND1  amplification as a biomarker for the clinical response to treatment with immune checkpoint inhibitors (ICIs) are unknown. Our study is a preliminary investigation mainly focused on the predictive function of  CCND1  amplification in the tumor microenvironment (TME) in the aspect of genome and transcriptome. We examined the prevalence of  CCND1  amplification and its potential as a biomarker for the efficacy of ICI therapy for solid tumors using a local database ( n  = 6,536), The Cancer Genome Atlas (TCGA) database ( n  = 10,606), and the Memorial Sloan Kettering Cancer Center (MSKCC) database ( n  = 10,109). Comprehensive profiling was performed to determine the prevalence of  CCND1  amplification and the correlation with the prognosis and the response to ICIs. A  CCND1  amplification occurs in many cancer types and correlates with shorter overall survival and inferior outcomes with ICI therapy. Transcriptomic analysis showed various degrees of immune cell exclusion, including cytotoxic cells, T cells, CD8 +  T cells, dendritic cells (DCs), and B cells in the TME in a TCGA  CCND1  amplification population. The gene set enrichment analysis suggested that  CCND1  amplification correlates with multiple aggressive, immunosuppressive hallmarks including epithelial–mesenchymal transition, transforming growth factor (TGF)-β signaling, KRAS signaling, phosphoinositide 3-kinase (PI3K)/AKT/mammalian target of rapamycin (mTOR) signaling, p53 pathway, and hypoxia signaling in solid tumors. These findings indicate that  CCND1  amplification may be a key point related to immunosuppression in TME and multiple malignancy hallmarks, and it hinders not only the natural host immune responses but also the efficacy of ICIs.

CCND1 Amplification Contributes to Immunosuppression and Is Associated With a Poor Prognosis to Immune Checkpoint Inhibitors in Solid Tumors