Identification Of Mutations Related To Cisplatin-Resistance And Prognosis Of Patients With Lung Adenocarcinoma

BackgroundLung adenocarcinoma(LUAD)is the most common histologic type of nonsmall cell lung cancer(NSCLC;approximately 60%),and platinum-based chemotherapy is the cornerstone of the treatment for patients with LUAD.However,a considerable number of patients experience tumor recurrence after developing cisplatin(cis-diamminedichloroplatinum(Ⅱ)or CDDP)resistance.Therefore,it is particularly important to screen primary CDDP-resistant LUAD patient populations,which can maximize the clinical benefits for these patients.ObjectivesThis study aimed to identify biomarkers for cisplatin resistance in lung adenocarcinoma and to explore potential mechanisms by bioinformatics analysis.MethodsData for 61 LUAD cell lines were downloaded from the Genomics of Drug Sensitivity in Cancer(GDSC)database to screen for mutations related to CDDP susceptibility,and whole-exome sequencing(WES)data of tumors from 45 LUAD patients from Zhujiang Hospital of Southern Medical University was retrospectively analyzed.Subsequently,the clinical prognostic value of these mutations was verified by using The Cancer Genome Atlas(TCGA)-LUAD cohort and our cohort(n=45).ResultsBased on drug sensitivity data for the GDSC-LUAD cell lines and survival analysis of the cohorts TCGA-LUAD and Local-LUAD,we found only one gene(GREB1)with mutations related to decreased CDDP sensitivity as well as worse overall survival(OS)and progression-free survival(PFS)[OS:log-rank P=0.038,hazard ratio(HR;95%confidence interval(95%CI)):2.19(0.73-6.55);PFS:log-rank P=0.001;HR:4.65,95%Cl:1.18-18.37].The GREB1-mutant(GREB1-MT)group had a higher frequency of gene mutations.Additionally,gene set enrichment analysis(GSEA)and single-sample GSEA(ssGSEA)suggested reduced accumulation of intracellular drugs in the GREB1-MT group,in addition to increased drug efflux and enhanced DNA damage repair and intracellular detoxification.ConclusionThis study found that GREB1 mutations may mediate the primary resistance and clinical prognosis of LUAD patients undergoing treatment with CDDP.Further functional analysis showed that GREB1 mutations are related to the known mechanism of CDDP resistance.These results suggest that GREB1 mutations are potential biomarkers for screening of CDDP resistance among LUAD patients.