FAIM (Fas apoptotic inhibitory molecule) is an evolutionarily conserved anti-apoptotic protein that primarily functions to inhibit Fas-mediated cell death 1. The protein exists in multiple alternatively spliced isoforms, with FAIM-S ubiquitously expressed across tissues and FAIM-L predominantly found in nervous tissues 12. FAIM's mechanism involves conferring resistance to death receptor signaling, particularly in B cells activated through surface immunoglobulin engagement 1. Beyond apoptosis regulation, FAIM promotes neurite outgrowth through NF-κB and ERK signaling pathways and regulates autophagy by modulating glutaminolysis in cancer cells 13. In lung adenocarcinoma, FAIM enhances GAC tetramer formation through PKCε-mediated phosphorylation and stabilizes GAC protein, leading to increased α-ketoglutarate production and mTOR pathway activation 3. FAIM also promotes hepatocellular carcinoma progression by facilitating HMGA1-CDK7 interactions and enhancing HMGA1 phosphorylation and stability 4. Recent multi-omics studies have identified FAIM as a potential therapeutic target in glioblastoma and as a causal gene associated with lung function traits 56. These findings expand FAIM's functional repertoire beyond apoptosis inhibition to include roles in cell metabolism, cancer progression, and tissue-specific physiological processes.