Objective To investigate the role of lysyl oxidase-like 2(LOXL2)in the diagnosis and prognosis of lung adenocarcinoma by analyzing the expression,genomic changes,prognosis and immune infiltration of LOXL2 in multiple databases.Methods LOXL2 expression was analyzed by TIMER,UALCAN,GEPIA and Kaplan-Meier databases and survival analysis was performed.Genomic changes of LOXL2 in lung adenocarcinoma patients were analyzed using cBioPortal database.The correlation between LOXL2 and immune cell infiltration and immune checkpoint was analyzed by TIMER.The protein expression of LOXL2 in normal lung tissue and lung adenocarcinoma tissue was described using HPA database.Results The mRNA and protein levels of LOXL2 in lung adenocarcinoma were higher than those in normal tissues.High expression of LOXL2 was associated with a later stage and poorer prognosis of lung adenocarcinoma.The rate of genetic change in LOXL2 was 6%.LOXL2 was strongly associated with partial immune cell infiltration and immune checkpoints (programmed cell death protein-1 [PD-1]and cytotoxic T lymphocyte-associated antigen 4 [CTLA-4])in lung adenoma.Immunohistochemistry showed that the protein expression of LOXL2 in lung adenocarcinoma was higher than that in normal lung tissue.Conclusion Through multi-omics data mining,LOXL2 is highly expressed in lung adenocarcinoma tissues,and is associated with immune cell infiltration and poor prognosis of patients.LOXL2 can be used as a novel biomarker for diagnosis and prognosis of lung adenocarcinoma.