Five new cases of syndromic intellectual disability due to KAT6A mutations: widening the molecular and clinical spectrum

BACKGROUND

Pathogenic variants of the lysine acetyltransferase 6A or KAT6A gene are associated with a newly identified neurodevelopmental disorder characterized mainly by intellectual disability of variable severity and speech delay, hypotonia, and heart and eye malformations. Although loss of function (LoF) mutations were initially reported as causing this disorder, missense mutations, to date always involving serine residues, have recently been associated with a form of the disorder without cardiac involvement.

RESULTS

In this study we present five new patients, four with truncating mutations and one with a missense change and the only one not presenting with cardiac anomalies. The missense change [p.(Gly359Ser)], also predicted to affect splicing by in silico tools, was functionally tested in the patient's lymphocyte RNA revealing a splicing effect for this allele that would lead to a frameshift and premature truncation.

CONCLUSIONS

An extensive revision of the clinical features of these five patients revealed high concordance with the 80 cases previously reported, including developmental delay with speech delay, feeding difficulties, hypotonia, a high bulbous nose, and recurrent infections. Other features present in some of these five patients, such as cryptorchidism in males, syndactyly, and trigonocephaly, expand the clinical spectrum of this syndrome.

Recommendations for Improving the Quality of Rare Disease Registries

Rare diseases (RD) patient registries are powerful instruments that help develop clinical research, facilitate the planning of appropriate clinical trials, improve patient care, and support healthcare management. They constitute a key information system that supports the activities of European Reference Networks (ERNs) on rare diseases. A rapid proliferation of RD registries has occurred during the last years and there is a need to develop guidance for the minimum requirements, recommendations and standards necessary to maintain a high-quality registry. In response to these heterogeneities, in the framework of RD-Connect, a European platform connecting databases, registries, biobanks and clinical bioinformatics for rare disease research, we report on a list of recommendations, developed by a group of experts, including members of patient organizations, to be used as a framework for improving the quality of RD registries. This list includes aspects of governance, Findable, Accessible, Interoperable and Reusable (FAIR) data and information, infrastructure, documentation, training, and quality audit. The list is intended to be used by established as well as new RD registries. Further work includes the development of a toolkit to enable continuous assessment and improvement of their organizational and data quality.

Social/economic costs and health-related quality of life in patients with juvenile idiopathic arthritis in Europe

OBJECTIVE

The aim of this study was to determine the economic burden from a societal perspective and the health-related quality of life (HRQOL) of patients with juvenile idiopathic arthritis (JIA) in Europe.

METHODS

We conducted a cross-sectional study of patients with JIA from Germany, Italy, Spain, France, the United Kingdom, Bulgaria, and Sweden. Data on demographic characteristics, healthcare resource utilization, informal care, labor productivity losses, and HRQOL were collected from the questionnaires completed by patients or their caregivers. HRQOL was measured with the EuroQol 5-domain (EQ-5D-5L) questionnaire.

RESULTS

A total of 162 patients (67 Germany, 34 Sweden, 33 Italy, 23 United Kingdom, 4 France, and 1 Bulgaria) completed the questionnaire. Excluding Bulgarian results, due to small sample size, country-specific annual health care costs ranged from €18,913 to €36,396 (reference year: 2012). Estimated direct healthcare costs ranged from €11,068 to €22,138; direct non-healthcare costs ranged from €7837 to €14,155 and labor productivity losses ranged from €0 to €8715. Costs are also shown to differ between children and adults. The mean EQ-5D index score for JIA patients was estimated at between 0.44 and 0.88, and the mean EQ-5D visual analogue scale score was estimated at between 62 and 79.

CONCLUSIONS

JIA patients incur considerable societal costs and experience substantial deterioration in HRQOL in some countries. Compared with previous studies, our results show a remarkable increase in annual healthcare costs for JIA patients. Reasons for the increase are the inclusion of non-professional caregiver costs, a wider use of biologics, and longer hospital stays.

Social/economic costs and quality of life in patients with haemophilia in Europe

OBJECTIVE

The aim of this study was to determine the economic burden from a societal perspective and the health-related quality of life (HRQOL) of patients with haemophilia in Europe.

METHODS

We conducted a cross-sectional study of patients with haemophilia from Bulgaria, France, Germany, Hungary, Italy, Spain Sweden and the UK. Data on demographic characteristics, health resource utilisation, informal care, loss of labour productivity and HRQOL were collected from the questionnaires completed by patients or their caregivers. HRQOL was measured with the EuroQol 5-domain (EQ-5D) questionnaire. The costs have been estimated from a societal perspective adopting a bottom-up approach.

RESULTS

A total of 401 questionnaires were included in the study, of which 339 were collected from patients with haemophilia and 62 from caregivers. The lowest average annual cost per person was reported in Bulgaria (€6,660) and the highest in Germany (€194,490). Our results demonstrate both a large difference from country to country in the average annual cost per patient in 2012 and the driving role of drugs in costs. Drugs represent nearly 90 % of direct healthcare costs in a majority of the countries analysed (Hungary, Italy, Spain and Germany). In Bulgaria, France and Sweden, however, healthcare services (visits, tests and hospitalisations) prevail. Costs are also shown to differ between children and adults. The mean EQ-5D index score for adult patients was 0.69 and mean EQ-5D VAS was 66.6. The mean EQ-5D index score for carers was 0.87 and mean EQ-5D VAS was 75.5. In the disability score, 60 % showed no disability and measuring caregiver burden with the Zarit Index produced an overall mean score of 25.3.

CONCLUSION

We have shown that haemophilia is associated with a substantial economic burden and impaired HRQOL. Studies on cost of illness and HRQOL are important for haemophilia as the future of this disease is likely to change with the development of new innovative treatments. The introduction of these treatments will most likely impact future costs related to haemophilia.

Social/economic costs and health-related quality of life in patients with Prader-Willi syndrome in Europe

OBJECTIVE

The aim of this study was to determine the economic burden from a societal perspective and health-related quality of life (HRQOL) of patients with Prader-Willi syndrome (PWS) in Europe.

METHODS

We conducted a cross-sectional study of patients with PWS from Spain, Bulgaria, Hungary, Germany, Italy, the UK, Sweden and France. Data on demographic characteristics, healthcare resource utilisation, informal care, labour productivity losses and HRQOL were collected from questionnaires completed by patients or their caregivers. HRQOL was measured with the EuroQol 5-domain (EQ-5D) questionnaire.

RESULTS

A total of 261 patients completed the questionnaire. The average annual costs ranged from € 3937 to € 67,484 between countries; the reference year for unit prices was 2012. Direct healthcare costs ranged from € 311 to € 18,760, direct non-healthcare costs ranged from € 1269 to € 44,035, and loss of labour productivity ranged from € 0 to € 2255. Costs were also shown to differ between children and adults. The mean EQ-5D index score for adult PWS patients ranged between 0.40 and 0.81 and the mean EQ-5D visual analogue scale score ranged between 51.25 and 90.00.

CONCLUSION

The main strengths of this study lie in our bottom-up approach to costing and in the evaluation of PWS patients from a broad societal perspective. This type of analysis is very scarce in the international literature on rare diseases in comparison with other illnesses. We conclude that PWS patients incur considerable societal costs and experience substantial deterioration in HRQOL.

Social/economic costs and health-related quality of life of mucopolysaccharidosis patients and their caregivers in Europe

OBJECTIVES

To assess the health-related quality of life (HRQOL) of patients with mucopolysaccharidosis (MPS) and their caregivers and to quantify the disease-related costs from a societal perspective.

METHODS

In the context of a multi-country study of rare diseases (BURQOL-RD project), a cross-sectional survey was performed among MPS patients in seven European countries. Data on demographic characteristics, health resource utilization, informal care, and loss of labor productivity were collected. The EQ-5D, Barthel index (BI), and Zarit burden interview (ZBI) questionnaires were used to assess patients' and their informal caregivers' quality of life, patients' functional ability, and caregivers' burden, respectively.

RESULTS

Altogether, 120 patients (children 62 %, females 40 %) and 66 caregivers completed the questionnaire. Patients' mean age was 16.5 years and median age at diagnosis was 3 years. Adult patients' average EQ-5D and EQ VAS scores varied across countries from 0.13 to 0.43 and 30.0 to 62.2, respectively, mean BI was 46.7, and ZBI was 32.7. Mean informal care time was 51.3 h/week. The mean total annual cost per patient (reference year 2012) was €24,520 in Hungary, €25,993 in France, €84,921 in Italy, €94,384 in Spain, and €209,420 in Germany. Costs are also shown to differ between children and adults. Direct costs accounted for most of the costs in all five countries (80, 100, 99, 98, and 93 %, respectively).

CONCLUSIONS

MPS patients experience substantial loss of HRQOL and their families take a remarkable part in their care. Although utilization of health and social care resources varies significantly across countries, MPS incurs considerable societal costs in all the countries studied.

Social/economic costs and health-related quality of life in patients with histiocytosis in Europe

OBJECTIVE

The aim of this study was to determine the economic burden from a societal perspective and the health-related quality of life (HRQOL) of patients with histiocytosis in Europe.

METHODS

We conducted a cross-sectional study of patients with histiocytosis from France, Germany, Italy, Spain, Bulgaria, the UK, and Sweden. Data on demographic characteristics, health resource utilisation, informal care, loss of labour productivity and HRQOL were collected from the questionnaires completed by patients or their caregivers. HRQOL was measured with the EuroQol 5-domain (EQ-5D) questionnaire.

RESULTS

A total of 134 patients (35 France, 32 Germany, 30 Italy, 24 Spain, 7 Bulgaria, 4 UK and 2 Sweden) completed the questionnaire. The average annual costs ranged from € 6832 to € 33,283 between countries, the year of reference being 2012. Estimated direct healthcare costs ranged from € 1698 to € 18,213; direct nonhealthcare costs ranged from € 2936 to € 17,622 and labour productivity losses ranged from € 1 to € 8855. The mean EQ-5D score for adult histiocytosis patients was estimated at between 0.32 and 0.85, and the mean EQ-5D visual analogue scale score was estimated at between 50.00 and 66.50.

CONCLUSION

The main strengths of this study lie in our bottom-up approach to costing and in the evaluation of histiocytosis patients from a broad perspective (societal costs). This type of analysis is very scarce in international literature for rare diseases in comparison with other illnesses. We conclude that histiocytosis patients incur considerable societal costs and experience substantial deterioration in HRQOL.

Social/economic costs and health-related quality of life in patients with fragile X syndrome in Europe

OBJECTIVE

To estimate the social/economic costs of fragile X syndrome (FXS) in Europe and to assess the health-related quality of life (HRQOL) of patients and caregivers.

METHODS

A cross-sectional study was conducted in a sample of European countries. Patients were recruited through patients' associations. Data on their resource use and absence from the labour market were retrospectively obtained from an online questionnaire. Costs were estimated by a bottom-up approach and the EuroQol-5 Domain (EQ-5D) questionnaire was used to measure patients' and caregivers' HRQOL.

RESULTS

Five countries were included in the analysis. The mean annual cost of FXS per patient varied from €4951 in Hungary to €58,862 in Sweden. Direct non-healthcare costs represented the majority of costs in all countries but there were differences in the share incurred by formal and informal care among those costs. Costs were also shown to differ between children and adults. Mean EQ-5D utility score for adult patients varied from 0.52 in France (n = 42) to 0.73 in Hungary (n = 2), while for caregivers this score was consistently inferior to 0.87.

CONCLUSION

Our findings underline that, although its prevalence is low, FXS is costly from a societal perspective. They support the development of tailored policies to reduce the consequences of FXS on both patients and their relatives.

Social/economic costs and health-related quality of life in patients with scleroderma in Europe

OBJECTIVE

The aim of this study was to determine the economic burden from a societal perspective and the health-related quality of life (HRQOL) of patients with systemic sclerosis (SSc; scleroderma) in Europe.

METHODS

We conducted a cross-sectional study of patients with SSc (involving both localised and systemic sclerosis) from Germany, Italy, Spain, France, the UK, Hungary and Sweden. Data on demographic characteristics, healthcare resource utilisation, informal care, labour productivity losses and HRQOL were collected from the questionnaires completed by patients or their caregivers. HRQOL was measured with the EuroQol 5-domain (EQ-5D) questionnaire.

RESULTS

A total of 589 patients completed the questionnaire. The rate of patients with localised scleroderma, limited cutan and diffuse cutan SSc were 28, 68 and 4 %, respectively. Average annual costs varied from country to country and ranged from € 4607 to € 30,797 (reference year: 2012). Estimated direct healthcare costs ranged from € 1413 to € 17,300; direct non-healthcare costs ranged from € 1875 to € 4684 and labour productivity losses ranged from € 1701 to € 14,444. The mean EQ-5D index score for adult SSc patients varied from 0.49 to 0.75 and the mean EQ-5D visual analogue scale score was between 58.72 and 65.86.

CONCLUSION

The main strengths of this study lie in our bottom-up approach to costing and our evaluation of SSs patients from a broad societal perspective. This type of analysis is very unusual in the international literature on rare diseases in comparison with other illnesses. We concluded that SSc patients incur considerable societal costs and experience substantial deterioration in HRQOL.

Social/economic costs and health-related quality of life in patients with cystic fibrosis in Europe

OBJECTIVES

Our goal was to provide data on the economic burden and health-related quality of life (HRQOL) of patients with cystic fibrosis (CF) and their caregivers in Europe.

METHODS

A cross-sectional study was carried out on adults and children with CF in eight European countries. Patients completed an anonymous questionnaire regarding their socio-demographic characteristics, use of healthcare services and presence of a caregiver. Costs were calculated with a bottom-up approach using unit costs from each participating country, and HRQOL was assessed using EQ-5D. The principal caregiver also answered a questionnaire on their characteristics, HRQOL and burden.

RESULTS

A total of 905 patients with CF was included (399 adults and 506 children). The total average annual cost per patient varied from €21,144 in Bulgaria to €53,256 in Germany. Adults had higher direct healthcare costs than children, but children had much higher informal care costs (P < 0.0001). Total costs increased with patients' level of dependence. In adults, mean utility fell between 0.640 and 0.870, and the visual analogue scale ranged from 46.0 to 69.7. There was no difference in caregiver HRQOL regardless of whether they cared for an adult or a child. However, caregivers who looked after a child had a significantly higher burden (P = 0.0013).

CONCLUSIONS

Our study highlights the burden of CF in terms of costs and decreased HRQOL for both patients and their caregivers throughout Europe.

Social/economic costs and health-related quality of life in patients with epidermolysis bullosa in Europe

BACKGROUND

The aim of this study was to determine the social/economic costs and health-related quality of life (HRQOL) of patients with epidermolysis bullosa (EB) in eight EU member states.

METHODS

We conducted a cross-sectional study of patients with EB from Bulgaria, France, Germany, Hungary, Italy, Spain, Sweden and the United Kingdom. Data on demographic characteristics, health resource utilisation, informal care, labour productivity losses, and HRQOL were collected from the questionnaires completed by patients or their caregivers. HRQOL was measured with the EuroQol 5-domain (EQ-5D) questionnaire.

RESULTS

A total of 204 patients completed the questionnaire. Average annual costs varied from country to country, and ranged from €9509 to €49,233 (reference year 2012). Estimated direct healthcare costs ranged from €419 to €10,688; direct non-healthcare costs ranged from €7449 to €37,451 and labour productivity losses ranged from €0 to €7259. The average annual cost per patient across all countries was estimated at €31,390, out of which €5646 accounted for direct health costs (18.0 %), €23,483 accounted for direct non-healthcare costs (74.8 %), and €2261 accounted for indirect costs (7.2 %). Costs were shown to vary across patients with different disability but also between children and adults. The mean EQ-5D score for adult EB patients was estimated at between 0.49 and 0.71 and the mean EQ-5D visual analogue scale score was estimated at between 62 and 77.

CONCLUSION

In addition to its negative impact on patient HRQOL, our study indicates the substantial social/economic burden of EB in Europe, attributable mostly to high direct non-healthcare costs.

Social/economic costs and health-related quality of life in patients with Duchenne muscular dystrophy in Europe

OBJECTIVE

The aim of this study was to determine the economic burden from a societal perspective and the health-related quality of life (HRQOL) of patients with Duchenne muscular dystrophy (DMD) in Europe.

METHODS

We conducted a cross-sectional study of patients with DMD from Bulgaria, France, Germany, Hungary, Italy, Spain, Sweden, and the UK. Data on demographic characteristics, healthcare resource utilization, informal care, labor productivity losses, and HRQOL were collected from the questionnaires completed by patients or their caregivers. HRQOL was measured with the EuroQol 5-domain (EQ-5D) questionnaire. Costs have been estimated from a societal perspective adopting a bottom-up approach.

RESULTS

A total of 422 questionnaires were included in the study; 268 of which were collected from patients with DMD and 154 from caregivers. The average annual cost per person in 2012 ranged from €7657 in Hungary to €58,704 in France. Direct non-healthcare costs are the main component of whole costs and informal care is the main driver of non-healthcare costs. Costs are also shown to differ between children and adults. With regard to HRQOL of adult patients, the EQ-5D VAS score and EQ-5D index scores were 50.5 and 0.24, respectively. The corresponding EQ-5D VAS and EQ-5D index scores for caregivers were 74.7 and 0.71, respectively.

CONCLUSIONS

We have estimated the average annual cost per patient with DMD in eight European countries adopting a social perspective, and to our knowledge this is the first study with such a wide perspective. The results on costs show a considerable gap between Eastern and Western European countries. Non-healthcare costs range from 64 to 89 % of overall costs and informal care is to a great extent the main driver of this cost category. The HRQOL of people with DMD is much lower than that of the general population.

Childhood vasculitis hospitalizations in Spain, 1997-2011

The aim of this study is to describe the childhood vasculitis hospital burden in Spain (1997-2011), considering type of disease, hospitalization rates and time trends. Data were obtained from the National Discharges Basic Minimum Data Set (National Patient Data Base). Inpatient events of children younger than 15 years of age were analyzed. Principal diagnosis of vasculitis were selected according Ninth Revision of the International Classification of Diseases: Takayasu arteritis, Polyarteritis nodosa, Kawasaki disease, Wegener`s granulomatosis, Churg-Strauss syndrome, and Henoch-Schönlein purpura. A total of 14518 children hospitalizations related to vasculitis were identified in Spain from 1997 to 2011. The average hospitalization rate for children was 13.33±1.71 per 100,000. Henoch-Schönlein purpura and Kawasaki disease were the most common type of vasculitis, hospitalization rates were 11.00 and 3.97 per 100,000 children, respectively. Other vasculitis hospitalizations are much rare in childhood. Average length of stay was 6.04 days and estimated cost per inpatient hospital care was 2,847€. Hospital case fatality rate was 0.05% for overall vasculitis. In conclusion, epidemiological data of childhood vasculitis are useful both to health decision-making and to identify research priorities.

Delphi approach to select rare diseases for a European representative survey. The BURQOL-RD study

OBJECTIVES

The BURQOL-RD project is intended to develop a disease based model capable of quantifying the socio-economic burden and health-related quality of life for patients with rare diseases (RDs) and their caregivers in Europe. We described the methodology used to select a set of 10 RDs to be approached in a pilot study.

METHODS

BURQOL-RD project includes 23 partners from 8 European countries: Spain, UK, France, Germany, Sweden, Italy, Hungary and Bulgaria. A two-round Delphi panels in combination with Carroll diagram was used to generate consensus in the selection of the 10 RDs among the project participants.

RESULTS

The two Delphi rounds yielded a prioritised list, to which the Carroll diagram was applied, taking into account three determinants: prevalence, availability of effective treatment and need for carer. The final set of RD to be studied was obtained: cystic fibrosis, Prader-Willi syndrome, haemophilia, duchenne muscular dystrophy, epidermolysis bullosa, fragile X syndrome, scleroderma, mucopolysaccharidosis, juvenile idiopathic arthritis and histiocytosis.

CONCLUSIONS

This methodology permitted the generation of an equilibrated set of RDs for the pilot study of BURQOL-RD project. The model will be suitable for application in a wide range of RDs.