Rare childhood diseases: how should we respond?

Paradoxically, rare diseases are common, collectively affecting 6–10% of the population and have a huge impact on patients and families, health services, clinicians and the wider community. Accurate data are required to inform clinical practice, government policy and health service planning. We recommend a national approach, similar to that adopted in the USA and Europe, to support research and promote advocacy and equitable access to services for children with rare diseases.