Figure 1. Workflow of this study. The analysis process of HRD-related RNA is shown on the left. HRD scores were obtained by calculating LOH, LST, and TAI for each sample of TCGA-LUAD. Patients were classified as HRD and non-HRD according to cut-off values. The screening and identification of markers are shown to the right. MS4A6A was identified as a potential immunotherapeutic marker by survival analysis, immune microenvironment, and immune checkpoint analysis.