Abstract
Although health-related quality of life (HRQoL) has been increasingly valued in healthcare and in clinical trials, there is scarce information about it in spinocerebellar ataxia type 3/Machado–Joseph disease (SCA3/MJD). This study describes the HRQoL results obtained from ataxic SCA3/MJD subjects, and their non-ataxic offspring included in the BIGPRO (Biomarkers and genetic modifiers in a study of presymptomatic and symptomatic SCA3/MJD carriers) study. Demographic data, clinical scales, and HRQoL instruments EQ-5D-3L and SF-36 were collected. Subjects at 50% risk were genotyped in a double-blind manner. The time left until the onset of the disease was estimated for mutation carriers with a SARA < 3 and combined with disease duration of ataxic subjects (TimeToAfterOnset). Analyses were performed using PASW Statistics version 18.0, R version 4.0.0, and G*Power 3.1, and p < 0.05 was considered statistically significant. Twenty-three ataxic carriers, 33 pre-ataxic carriers, and 21 controls were enrolled. Significant differences between ataxic carriers and controls were seen in EQ-VAS, EQ-5D Index, and in some domains of EQ-5D-3L and SF-36. EQ-5D Index showed the best effect size between ataxic and controls (Cohen’s d = 2.423). Stepwise changes were seen in pre-ataxic subjects, although not statistically significant. TimeToAfterOnset correlated with EQ-5D Index, EQ-VAS, and SF-36 Physical functioning, Role Physical, Pain, and General Health. EQ-5D Index and EQ-VAS correlated with clinical scales in the ataxic group. These results suggest that HRQoL worsens among carriers since pre-ataxic stages and that they might encompass the underlying disease process. In this cohort, SF-36 Physical Functioning, SF-36 General health, and especially EQ-5D Index and EQ-VAS were the best HRQoL instruments to be used as ancillary evidence to support biological and social meanings for future interventions.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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We thank all the subjects and families who contributed to this study.
Funding
This study was supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) (CAPES-Probral grant number 99999.008137/2015–03), Fundação do Amparo à Pesquisa do Rio Grande do Sul (FAPERGS) (grant numbers 17/2551–0001 035–3 and 17/2551–0001 1463–4), and Fundo de Incentivo à Pesquisa do Hospital de Clínicas de Porto Alegre (FIPE-HCPA) (grant numbers 17–0014, 17–0015, and 17–0201). G.B. and C.M.O. were supported by CAPES. A.G.R., G.E., and J.A.S. were supported by FAPERGS. A.H.C., L.S.S., A.C.M., M.L.S.P., and L.B.J. were supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Brazil.
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G.B., V.B.L., and L.B.J. contributed to the conception and design of the study; G.B., V.B.L., C.M.O., A.H.C., A.G.R., G.E., J.A.S., N.K., M.R., A.C.M., L.S.S., M.L.S.P., and L.B.J. contributed to the acquisition and analysis of data; G.B., V.B.L., M.L.S.P., and L.B.J. contributed to drafting the text and preparing the figures. All authors reviewed the manuscript.
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This study was approved by the Institutional Ethics Committee (Comissão de Ética em Pesquisa do Hospital de Clínicas de Porto Alegre) and by the Brazilian Board (Comissão Nacional de Pesquisa, CONEP) by the number CAAE 60751916.3.0000.5327. The present protocol was registered at the Clinical Trials under the number NCT04419974.
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Bolzan, G., Leotti, V.B., de Oliveira, C.M. et al. Quality of Life since Pre-Ataxic Phases of Spinocerebellar Ataxia Type 3/Machado–Joseph Disease. Cerebellum 21, 297–305 (2022). https://doi.org/10.1007/s12311-021-01299-8
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DOI: https://doi.org/10.1007/s12311-021-01299-8