Genetic Aberrations in the CDK4 Pathway Are Associated with Innate Resistance to PD-1 Blockade in Chinese Patients with Non-Cutaneous Melanoma

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
Jiayi YuYan Kong

Abstract

PD-1 checkpoint blockade immunotherapy induces long and durable response in patients with advanced melanoma. However, only a subset of patients with melanoma benefit from this approach. The mechanism triggering the innate resistance of anti-PD-1 therapy remains unclear. Whole-exome sequencing (WES) and RNA sequencing (RNA-Seq) analyses were performed in a training cohort (n = 31) using baseline tumor biopsies of patients with advanced melanoma treated with the anti-PD-1 antibody. Copy-number variations (CNVs) for the genes CDK4, CCND1, and CDKN2A were assayed using a TaqMan copy-number assay in a validation cohort (n = 85). The effect of CDK4/6 inhibitors combined with anti-PD-1 antibody monotherapy was evaluated in PD-1-humanized mouse (C57BL/6-hPD-1) and humanized immune system (HIS) patient-derived xenograft (PDX) models. WES revealed several significant gene copy-number gains in the patients of no clinical benefit cohort, such as 12q14.1 loci, which harbor CDK4. The association between CDK4 gain and innate resistance to anti-PD-1 therapy was validated in 85 patients with melanoma (P < 0.05). RNA-Seq analysis of CDK4-normal cell lines and CDK4-normal tumors showed altered transcriptional output in TNFα signaling via NF-κB, i...Continue Reading

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Citations

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