LCE4A (late cornified envelope 4A) is a structural protein that serves as a precursor of the cornified envelope in the stratum corneum, contributing to skin barrier formation 1. The gene functions through protein-protein interactions, with demonstrated binding capabilities that are essential for normal epidermal structure [UniProt annotation]. Beyond its primary structural role, LCE4A has emerged as a significant immunological factor. Genetic variants in the LCE4A-C1orf68 locus are strongly associated with susceptibility to candidemia, a serious bloodstream infection caused by Candida species 2. Individuals carrying two or more risk alleles at this locus demonstrate a 19.4-fold increased risk for candidemia compared to those without risk alleles 2. The LCE4A-C1orf68 variant also showed the strongest association with bladder cancer in an arsenic-exposed population from the Atacama Desert, suggesting involvement in epithelial immune barrier function during malignant transformation 1. However, in a clinical cohort of home parenteral nutrition patients, the LCE4A-C1orf68 SNP was not independently associated with candidemia development, suggesting that genetic predisposition may require additional clinical cofactors 3. These findings indicate that LCE4A functions at the intersection of structural barrier integrity and innate immune defense.