LALBA encodes α-lactalbumin, a regulatory subunit of lactose synthase that modulates galactosyltransferase substrate specificity in mammary tissue, enabling lactose synthesis as the primary milk carbohydrate 1. Beyond its classical lactation role, LALBA is aberrantly expressed in breast cancer tissues, with higher levels detected in aggressive subtypes and a slight trend toward poorer overall survival 2. LALBA expression correlates with tumor immune features including increased tumor-infiltrating lymphocytes and PD-L1 expression 2. The gene exhibits tissue-specific proteoform variations across lactation phases, with distinct isoforms present in colostrum, transition, and mature milk 3. In non-mammary contexts, LALBA protein accumulates in storage tissues when expressed transgenically, demonstrating nutritional application potential—transgenic maize expressing human LALBA showed 47.26% increased lysine content 4. Promoter polymorphisms influence LALBA expression levels and milk production traits in cattle; the TT genotype associates with high milk yield, lactose production, and improved udder health status 5. JAK/STAT signaling pathway alterations affect LALBA transcription, as demonstrated by decreased expression during hypothyroidism-induced mammary dysfunction 1. Genetically modified cows expressing human LALBA display altered serum metabolomes affecting amino acid and lipid metabolism 6. While primarily characterized for lactose biosynthesis, LALBA increasingly demonstrates relevance to breast cancer pathology and immune modulation.