Preterm infants were randomly allocated to receive preterm formula or banked human milk, alone or as supplements to the mother's own milk. The use of human milk was associated with a significantly-reduced incidence of allergic disease, particularly eczema at 18 months in those with a family history of atopic disease. In those without a family history there was no effect.
Lucas A et al. (1990). Early diet of preterm infants and development of allergic or atopic disease: Randomised prospective study. BMJ 300: 837-840. [Abstract]