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2. Importance of SPP1 genotype as a covariate in clinical trials in Duchenne muscular dystrophy

Author

P Boffi, Corrado Angelini, Luisa Politano, Guja Astrea, Eugenio Mercuri, Adele D'Amico, Tiziana Mongini, Marika Pane, Alessandra Ferlini, Giuseppe Vita, Sara Napolitano, Mario Ermani, Yvan Torrente, Francesca Gualandi, Antonella Taglia, Gaetano S. Grieco, Gian Luca Vita, Gianni Sorarù, Eric P. Hoffman, Angela Berardinelli, Andrea Barp, Esther Picillo, Gessica Vasco, Claudio Bruno, Roberta Battini, Stefano C. Previtali, Enrico Bertini, Giacomo P. Comi, Francesca Magri, Sonia Messina, Luca Bello, Luisa Piva, Maria Chiara Motta, Maria Sframeli, Carlo Minetti, Elisabetta Gazzerro, Elena Pegoraro, Bello, L, Piva, L, Barp, A, Taglia, A, Picillo, E, Vasco, G, Pane, M, Previtali, Sc, Torrente, Y, Gazzerro, E, Motta, Mc, Grieco, G, Napolitano, S, Magri, F, D'Amico, A, Astrea, G, Messina, S, Sframeli, M, Vita, Gl, Boffi, P, Mongini, T, Ferlini, A, Gualandi, F, Soraru', G, Ermani, M, Vita, G, Battini, R, Bertini, E, Comi, Gp, Berardinelli, A, Minetti, C, Bruno, C, Mercuri, E, Politano, Luisa, Angelini, C, Hoffman, Ep, and Pegoraro, E.

Subjects
Adult, medicine.medical_specialty, Adolescent, Duchenne muscular dystrophy, Single-nucleotide polymorphism, Polymorphism, Single Nucleotide, Settore MED/39 - NEUROPSICHIATRIA INFANTILE, Internal medicine, Genotype, medicine, Humans, Multicenter Studies as Topic, Longitudinal Studies, Muscular Dystrophy, Polymorphism, Child, Preschool, Retrospective Studies, Clinical Trials as Topic, business.industry, Genetic Variation, Retrospective cohort study, Articles, Single Nucleotide, Duchenne, medicine.disease, Muscular Dystrophy, Duchenne, Clinical trial, Child, Preschool, Ambulatory, Cohort, Physical therapy, Osteopontin, Neurology (clinical), business, Student's t-test
Abstract

Objective: To test the effect of the single nucleotide polymorphism −66 T>G (rs28357094) in the osteopontin gene ( SPP1 ) on functional measures over 12 months in Duchenne muscular dystrophy (DMD). Methods: This study was conducted on a cohort of ambulatory patients with DMD from a network of Italian neuromuscular centers, evaluated longitudinally with the North Star Ambulatory Assessment (NSAA) and the 6-Minute Walk Test (6MWT) at study entry and after 12 months. Genotype at rs28357094 was determined after completion of the clinical evaluations. Patients were stratified in 2 groups according to a dominant model (TT homozygotes vs TG heterozygotes and GG homozygotes) and clinical data were retrospectively compared between groups. Results: Eighty patients were selected (age 4.1–19.3 years; mean 8.3 ± 2.7 SD). There were no differences in age or steroid treatment between the 2 subgroups. Paired t test showed a significant difference in both NSAA ( p = 0.013) and 6MWT ( p = 0.03) between baseline and follow-up after 12 months in patients with DMD carrying the G allele. The difference was not significant in the T subgroup. The analysis of covariance using age and baseline values as covariate and SPP1 genotype as fixed effect showed that these parameters are significantly correlated with the 12-month values. Conclusions: These data provide evidence of the role of SPP1 genotype as a disease modifier in DMD and support its relevance in the selection of homogeneous groups of patients for future clinical trials.

Published
2012

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