TMPRSS15 and necrotizing enterocolitis: Enteral feeding intolerance is very common in preterm infants [25,28] and can be a sign of reduced gastrointestinal motility due to the insufficiency of insufficient mature enzymatic system (lactase, lipase, enterokinase, etc.)or may be the initial manifestation of the necrotizing enterocolitis (NEC) [30,31,32,33,34,35,36].