Tom Stiris

Human milk oligosaccharide (HMO) composition varies among lactating mothers and changes during the course of lactation period. Interindividual variation is largely driven by fucosyltransferase (FUT2 and FUT3) polymorphisms resulting in 4 distinct milk groups. Little is known regarding whether maternal physiological status contributes to HMO variability. We characterized the trajectories of 20 major HMOs and explored whether maternal pre-pregnancy body mass index (ppBMI), mode of delivery, or parity may affect milk HMO composition. Using longitudinal breastmilk samples from healthy mothers (n = 290) across 7 European countries, we characterized HMO composion and employed mixed linear models to explore associations of maternal characteristics with individual HMOs. We observed HMO-specific temporal trajectories and milk group dependencies. We observed relatively small but significant differences in HMO concentrations based on maternal ppBMI, mode of delivery and parity. Our findings suggest that HMO composition to be regulated time-dependently by an enzyme as well as substrate availability and that ppBMI, mode of delivery, and parity may influence maternal physiology to affect glycosylation marginally within the initital period of lactation. Our observational study is the largest European standardized and longitudinal (up to 4 months) milk collection study assessing HMO concentrations and basic maternal characteristics. Time of lactation and milk groups had the biggest impact on HMO variation. Future studies need to elucidate these observations and assess the physiological significance for the breastfed infant.

Health-care professionals who prescribe medicines have the professional duty to choose medicines that are in the best interest of their individual patient, irrespective if that patient is an adult or a child. However, the availability of medicines with an appropriate label for pediatric use is lagging behind those for adults, and even available pediatric drugs are sometimes not suitable to administer to children. Consequently, health-care professionals often have no other option than to prescribe off-label medicines to children. An important reason for use of off-label medicines is to improve access to (innovative) treatments or to address medical needs and preferences of patients, especially when no other options are available. However, off-label use of medicines is in general not supported by the same level of evidence as medicines licensed for pediatric use. This may result in increased uncertainty on efficacy as well as the risk for toxicity and other side effects. In addition, liability may also be of concern, counterbalanced by professional guidelines.Conclusion: The purpose of this joint EAP/ESDPPP policy statement is to offer guidance for HCPs on when and how to prescribe off-label medicines to children and to provide recommendations for future European policy.