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Abstract Details

Development of Validated Clinical Outcome Assessments in Limb Girdle Muscular Dystrophy R1/2A
Neuromuscular and Clinical Neurophysiology (EMG)
P14 - Poster Session 14 (11:45 AM-12:45 PM)
11-004
To determine the test-retest reliability of functional motor clinical outcome assessments (COAs) in limb girdle muscular dystrophy R1 (LGMDR1).
LGMDR1 is an autosomal recessive form of LGMD due to mutations in calpain-3 (CAPN3),  resulting in progressive muscle weakness.  Advances in gene replacement technologies raise the possibility of disease altering treatments requiring future clinical trials. A barrier to clinical trials is an incomplete understanding of the natural history of LGMDR1 as measured by functional motor COAs.
Prospective observational study of clinically affected, genetically defined LGMDR1 participants seen at 7 academic centers and followed for up to 24 months.  COAs include the 100-meter timed test, the North Star Assessment for Limb Girdle-type Muscular Dystrophies (NSAD), 4-stair climb, Timed Up and Go,  the Performance of Upper Limb 2.0 (PUL), and handheld dynamometry (HHD, 6 bilateral upper extremity muscles).  The baseline visit was split over 2 days for reliability testing. Participants were classified as ambulators (A) or  difficulty with ambulation (DA) based on baseline 10-meter walk/run < or ≥ 12 seconds. Cross sectional associations were evaluated using Pearson correlation coefficients; Test – retest reliability was evaluated using the intraclass-correlation coefficient (ICC).
Twenty-two (75 target) participants have enrolled. Most are women (68%).  The mean age 37.1 years, mean symptom onset at 12.5 years, and mean diagnostic delay of 6.8 years. Both the NSAD and the PUL had excellent test-retest reliability, with ICCs 0.998 (95% confidence limit [CL] 0.994, 0.999) and 0.972 (95% CL 0.933, 0.988) respectively.  HHD had good to excellent test-retest reliability with ICC range (0.89-0.99). DA performance was lower/weaker on all COAs.
We obtained excellent test-retest reliability for all COAs in this multisite trial for LGMDR1.  Our understanding of stability and potential sources of variability in COA performance across baseline visits will inform future clinical trial design in LGMDR1.
Authors/Disclosures
Nicholas E. Johnson, MD, FAAN (Virginia Commonwealth University)
PRESENTER 		Dr. Johnson has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Sarepta Therapuetics. Dr. Johnson has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Dyne Therapeutics. Dr. Johnson has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Vertex Pharma. Dr. Johnson has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Avidity. Dr. Johnson has received personal compensation in the range of $100,000-$499,999 for serving as a Consultant for Arthex. Dr. Johnson has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Juvena. Dr. Johnson has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Rgenta. Dr. Johnson has received personal compensation in the range of $500-$4,999 for serving as a Consultant for AskBio. Dr. Johnson has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Argenx. Dr. Johnson has received personal compensation in the range of $10,000-$49,999 for serving as an officer or member of the Board of Directors for Evolyra Therapeutics . Dr. Johnson has stock in Angle Therapeutics. Dr. Johnson has stock in Juvena Therapeutics. Dr. Johnson has stock in Evolyra Therapeutics. The institution of Dr. Johnson has received research support from Novartis. The institution of Dr. Johnson has received research support from Takeda . The institution of Dr. Johnson has received research support from AMO Pharma. The institution of Dr. Johnson has received research support from Sarepta. The institution of Dr. Johnson has received research support from Dyne Therapeutics. The institution of Dr. Johnson has received research support from AskBio. The institution of Dr. Johnson has received research support from Pepgen. The institution of Dr. Johnson has received research support from ML Bio. The institution of Dr. Johnson has received research support from Vertex. The institution of Dr. Johnson has received research support from Arthex. The institution of Dr. Johnson has received research support from Avidity Biosciences. The institution of Dr. Johnson has received research support from Edgewise. Dr. Johnson has received intellectual property interests from a discovery or technology relating to health care.
No disclosure on file
No disclosure on file
Lindsay N. Alfano, PT (Nationwide Children'S Hospital) Ms. Alfano has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for ATOM International, Ltd (Amicus Therapeutics, Catabasis, Genethon, Italfarmaco, NS Pharma, Pfizer, PTC Therapeutics). Ms. Alfano has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Sarepta Therapeutics. The institution of Ms. Alfano has received research support from Novartis Gene Therapies. The institution of Ms. Alfano has received research support from Sarepta Therapeutics. The institution of Ms. Alfano has received research support from Audentes Therapeutics/Astellas Gene Therapies. Ms. Alfano has received intellectual property interests from a discovery or technology relating to health care.
Conrad Weihl, MD, PhD (Washington University in St. Louis) Dr. Weihl has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Sarepta. Dr. Weihl has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Casma therapeutics. Dr. Weihl has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Abata. Dr. Weihl has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Sarepta. Dr. Weihl has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Sarepta. Dr. Weihl has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Acceleron. Dr. Weihl has received personal compensation in the range of $5,000-$9,999 for serving as an Expert Witness for Wilson Elser Moskowitz Edelman & Dicker LLP.
Linda P. Lowes, PT PhD The institution of Ms. Lowes has received research support from Sarepta Therapeutics.
Matthew P. Wicklund, MD, FAAN (UT Health San Antonio) Dr. Wicklund has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Amicus Therapeutics. Dr. Wicklund has received personal compensation in the range of $10,000-$49,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Sanofi-Genzyme. Dr. Wicklund has received personal compensation in the range of $5,000-$9,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Sarepta Therapeutics. Dr. Wicklund has received personal compensation in the range of $5,000-$9,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Spark Therapeutics. Dr. Wicklund has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Ultragenyx. Dr. Wicklund has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Vertex Pharmaceuticals. The institution of Dr. Wicklund has received research support from Orphazyme. The institution of Dr. Wicklund has received research support from Muscular Dystrophy Association. The institution of Dr. Wicklund has received research support from Coalition to Cure Calpain 3. The institution of Dr. Wicklund has received research support from Sarepta Therapeutics. The institution of Dr. Wicklund has received research support from ML Bio. The institution of Dr. Wicklund has received research support from Alexion. The institution of Dr. Wicklund has received research support from Acceleron. The institution of Dr. Wicklund has received research support from Edgewise. The institution of Dr. Wicklund has received research support from Fulcrum. The institution of Dr. Wicklund has received research support from Roche-Genentech. The institution of Dr. Wicklund has received research support from Avidity. Dr. Wicklund has received research support from Harmony Bioscience.
Katherine D. Mathews, MD, FAAN (University of Iowa - Dept of Pediatrics) Dr. Mathews has received personal compensation for serving as an employee of Avidity Bioscience. The institution of Dr. Mathews has received research support from NIH. The institution of Dr. Mathews has received research support from Centers for Disease Control and Prevention. The institution of Dr. Mathews has received research support from Muscular Dystrophy Association . The institution of Dr. Mathews has received research support from Friedreich's Ataxia Research Alliance . The institution of Dr. Mathews has received research support from Sarepta . The institution of Dr. Mathews has received research support from Pfizer. The institution of Dr. Mathews has received research support from Reata . The institution of Dr. Mathews has received research support from PTC Therapeutics, Inc. The institution of Dr. Mathews has received research support from Italfarmaco . The institution of Dr. Mathews has received research support from AMO. The institution of Dr. Mathews has received research support from FibroGen. The institution of Dr. Mathews has received research support from Capricor. The institution of Dr. Mathews has received research support from edgewise. The institution of Dr. Mathews has received research support from biogen.
Tahseen Mozaffar, MD, FAAN (University of California Irvine) Dr. Mozaffar has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Alexion Pharmaceuticals. Dr. Mozaffar has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Argenx. Dr. Mozaffar has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Sanofi-Genzyme. Dr. Mozaffar has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Amicus. Dr. Mozaffar has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Grifols. Dr. Mozaffar has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Astellas Gene Therapy. Dr. Mozaffar has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Bayer. Dr. Mozaffar has received personal compensation in the range of $10,000-$49,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Sarepta. Dr. Mozaffar has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Applied Therapeutics. The institution of Dr. Mozaffar has received research support from NIH. The institution of Dr. Mozaffar has received research support from Muscular Dystrophy Association. The institution of Dr. Mozaffar has received research support from Sanofi. The institution of Dr. Mozaffar has received research support from Argenx. The institution of Dr. Mozaffar has received research support from Amicus Therapeutics. The institution of Dr. Mozaffar has received research support from Astellas Gene Therpay. The institution of Dr. Mozaffar has received research support from Cartesian. The institution of Dr. Mozaffar has received research support from Cabaletta. Dr. Mozaffar has received personal compensation in the range of $500-$4,999 for serving as a Study Section Member with NIH.
No disclosure on file
No disclosure on file
Katy Eichinger, PhD, PT, DPT, NCS (University of Rochester) Dr. Eichinger has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Fulcrum. Dr. Eichinger has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Avidity. Dr. Eichinger has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for DyneTherapeutic. Dr. Eichinger has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Roche. Dr. Eichinger has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for TRiNDS. The institution of Dr. Eichinger has received research support from Charcot Marie Tooth Association. The institution of Dr. Eichinger has received research support from Muscular Dystrophy Association. Dr. Eichinger has received intellectual property interests from a discovery or technology relating to health care.
No disclosure on file