Endo-ERN covers an exceptionally large number of rare conditions across the age span. Whilst some conditions are covered in established international disease registries, there are several that are not. Collectively, the existing detailed disease registries display a number of qualities associated with good registry practice but the involvement of patients, participation by members of Endo-ERN and the research output of these registries is variable with a minimal capacity for interoperability. The central cause that has led to this variation is the lack of a core endocrine registry and the lack of core standards for registries. The overall objective of the European Registries for Rare Endocrine Conditions (EuRRECa) is to ensure that Endo-ERN acheives its mission of driving up standards of clinical care and patient-centred research through maximizing participation in disease registries. The project will do this by developing a new core endocrine registry that collects a core dataset that also includes objective markers of clinical outcome, runs an e-surveillance programme and signposts participants to high-quality, detailed, disease-specific and patient-centred registries that have been evaluated by EuRRECa. The project will achieve the above objective by building on the structure that has been created by Endo-ERN. EuRRECa will receive guidance from expert advisory groups that align with the thematic groups of Endo-ERN. Their guidance will flow through work packages that will review the needs of patients, parents and ethics, evaluate the quality and interoperability of datasets and combine them wth patient centred clinical outcomes. Clear policies that are acceptable to patients, researchers and industry for accessing data for research coupled with widespread dissemination and knowledge-exchange through closely affiliated professional endocrine societies, patient support groups and across all the ERNs will ensure that EuRRECa is sustained over the longer term.
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The European Registry for Rare Bone and Mineral Conditions (EuRR-Bone) aims to realise improved, harmonised healthcare for people living with rare bone and mineral conditions (RBMCs) across Europe. Our focus includes over 150 severe rare bone diseases that affect cartilage, bones and dentin and more than 40 severe rare diseases affecting phosphate and calcium metabolism. In this project, we will establish the first pan-European registry in RBMCs.

RBMCs constitute a complex group of diseases with evident need for better and more harmonised care. The lack of natural history data is significant, and the quality of care and expertise varies across regions and in many countries is still unclear. Depending on first symptoms and local healthcare processes, a wide variety of healthcare specialists can be involved in the process. Until recently, there was limited cross-disciplinary alignment: each discipline had its own network, conference, guidelines and even registries. The European Reference Network on Bone Disorders (ERN BOND) has taken the lead to better organise the field, to harmonise and improve RBMCs healthcare.
Specifically, in this project, a core group of ERN BOND healthcare providers, affiliated centres and experts will:

• Establish a centralised registry for RBMCs within the scope of ERN BOND in collaboration with the already established European Registry for Rare Endocrine Conditions, EuRRECa, covering a core longitudinal minimal data set to capture their natural history from both clinician and patient perspectives.
• Establish four disease specific modules on Fibrous Dysplasia/McCune Albright syndrome (FD/MAS), Osteogenesis Imperfecta (OI), Rare Hypophosphatemia and Achondroplasia (ACHO), that capture genetic, clinical and patient related outcome measures in a scalable manner to other RBMCs.
• Provide a platform that enables detailed local, disease-specific registries on rare bone and mineral disorders to connect to EuRR-Bone.


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