Adherence to cysteamine in nephropathic cystinosis: A unique electronic monitoring experience for a better understanding. A prospective cohort study: CrYSTobs.

INTRODUCTION: In nephropathic cystinosis (NC), adherence to cysteamine remains challenging; poor adherence is worsening the disease progression with a decline of kidney function and increase of extrarenal morbidities. Our objective was to describe adherence to cysteamine in NC patients, using electronic monitoring systems. METHODS: Patients with confirmed NC, aged > 4 years and receiving oral cysteamine (short acting or delayed release formulation as standard of care) from 3 French reference centers, were included. Adherence to treatment was primarily assessed as the percentage of days with a good adherence score, adherence score rating from 0 (poor) to 2 (good). A descriptive analysis was performed after 1-year follow-up. RESULTS: Seventeen patients (10 girls, median age: 13.9 (5.4-33.0) years) were included. Median age at diagnosis was 17.0 (3.0-76.9) months and age at start of cysteamine was 21.0 (15.5-116.3) months. Median daily dose of cysteamine was 1.05 (0.55-1.63) g/m2/day. Over the year, the median percentage of days with a good adherence score was 80 (1-99)% decreasing to 68 (1-99)% in patients > 11 years old. The median of average number of hours covered by treatment in a day was 22.5 (6.1-23.9) versus 14.9 (9.2-20.5) hours for delayed release versus short acting cysteamine. CONCLUSION: Our data are the first describing a rather good adherence to cysteamine, decreasing in adolescents and adults. We described a potential interest of the delayed release formulation. Our data highlight the need for a multidisciplinary approach including therapeutic education and individualized approaches in NC patients transitioning to adulthood. Graphical abstract.

[A complete clinical trial register is already a reality in the paediatric field]. / Le registre européen des essais cliniques pédiatriques est une réalité.

Clinical trials have a fundamental role in promoting an evidence based use of drugs in adults and in children. However, it is often difficult to identify the few paediatric studies carried out and to thus implement knowledge derived from them. Furthermore, studies that are stopped prematurely or that have insignificant or negative results often remain unpublished, leading to duplication of effort by researchers, waste of resources and concealment of potentially toxic risks. The European Community decided to support the development of a European register of clinical trials in children as part of the Fifth Framework Thematic Programme "Quality of Life" in 2002. The project DEC-net is coordinated by the Laboratory of Mother and Child Health of the Mario Negri Institute for Pharmaceutical Research in Milan and currently involves members of four countries; France, Italy, Spain and the United Kingdom. It is unique in that it is the first population oriented clinical trial register. Such a register represents a useful source for planning new studies, promoting communications and collaborations between researchers, facilitating patient access and recruitment into trials, preventing trial duplication and inappropriate funding and identifying the therapeutic needs of children that remain neglected. It will also allow for active monitoring of new or evolved knowledge of drug therapies.

The DEC-net European register of paediatric drug therapy trials: contents and context.

OBJECTIVE: To describe the results and conclusions of DEC-net, an international, publicly available register of paediatric drug therapy clinical trials, and to assess which paediatric health areas are covered by research and by which trial types. METHODS: The contents of the register, which was set up by four groups (Italy, UK, France, Spain) who searched for paediatric trials and collected data between 2004-2006, were analysed. The disease areas reflected were compared with those covered by published trials and Burden of Disease (BD) data. RESULTS: In all, 257 trial records were analysed, 86 of which were entered by the Italian partner, 84 by the UK partner, 56 by the French partner and 31 by the Spanish partner. Spain entered the majority of multinational trials, while the UK had the majority of single-centre national trials. Most trials were experimental (79%), and the most commonly represented diseases were neoplasms (14% trials). In all, 28% were double-blind randomised controlled trials (RCTs). The most common disease areas addressed in the 257 trials were similar to the published trials' areas. In contrast, the primary research area was low on the BD list. CONCLUSIONS: DEC-net has demonstrated that international research efforts exist, even for paediatrics, although there may be an imbalance between national and multinational studies and a limited approach to double-blind RCTs. Recent initiatives will increase the number of children participating in research, and European legislation will require prospective registration. Paediatric research priorities must be better defined, however, and this can be done by registering research and making the information available to all relevant actors.