This study aims to investigate the expression of FAT1 in lung adenocarcinoma and its relationship with immune infiltration.<h4>Methods</h4>Gene expression levels and relevant clinical information of 513 lung adenocarcinoma samples and 397 adjacent lung samples were obtained through The Cancer Genome Atlas (TCGA) and Genotype-Tissue Expression (GTEx) data. Here, FAT1 is linked to lung adenocarcinoma.