Innovative study design for paediatric clinical trials.

Purpose Despite representing a fundamental step towards the efficacious and safe utilisation of drugs in the paediatric population, the conduct of clinical trials in children poses several problems. Methodological issues and ethical concerns represent the major obstacles that have traditionally limited paediatric research. The randomised clinical trial, mainstay of clinical studies to assess the effects of any therapeutic intervention, shows some weaknesses that make it scarcely applicable to the paediatric population. Alternative and innovative approaches to clinical trial design in small populations have been developed in the last few decades with the aim of overcoming the limits related to small samples and to the acceptability of the trial.