Abstract Details

Title Longitudinal Characterization of the Clinical and DAT Characteristics of Participants with Scans without Evidence of Dopaminergic Deficit (SWEDDs): PPMI Cohort

Topic Movement Disorders

Presentation(s) S10 - Biomarkers in Movement Disorders (4:14 PM-4:25 PM)

Poster/Presentation
Number 005

Background SWEDD subjects may differ clinically and biologically from typical PD. Inclusion of these subjects may reduce the efficiency of clinical trials.

Objective To examine the evolution of the clinical and biological characteristics of participants with scans without evidence of dopaminergic deficit (SWEDDs).

Design/Methods The Parkinson’s Progression Markers Initiative (PPMI) is a longitudinal study of early PD. De novo PD participants were required to have abnormal DAT scan (visual read) for enrollment. Participants with the investigator diagnosis of PD and SWEDD were followed prospectively for 2 years. All participants were assessed with motor and non-motor scales, DAT imaging and biologic variables. DAT scan was assessed both visually and quantitatively using mean putamen specific binding ratio (SBR) < 65%, >=65 to <80 and >=80 as cut offs.

Results

16% of PD subjects were SWEDDs (80/503). 64/80 SWEDDs were enrolled in follow up. At baseline there was no age/ gender, disease duration difference between SWEDDs and PD subjects. SWEDDs had lower MDS-UPDRS Part III score and higher part I score. 8/64 SWEDDs had <65% SBR at baseline. 48/ 64 SWEDDs had 2 year DAT scan (Table 1). Data on the evolution of the clinical characteristics of SWEDDs will be presented.


SBR	PD (N = 347)	SWEDD (N = 48)
>= 80% to >= 65%; < 80%	2	5
>= 80% to < 65%	0	0
>= 65%; < 80% to >= 80%	1	2
>= 65%; < 80% to < 65%	5	2
< 65% to >= 80%	0	0
< 65% to >= 65%; < 80%	0	1
< 65% at Both Scans	338	5
>= 65%; < 80% at Both Scans	0	3
>= 80% at Both Scans	1	30

Conclusions

There is 10% variance between visual and quatitative definition of SWEDDs. Quatitative interpretation provides more accurate assesment of the degree of presynaptic terminal loss.

Authors/Disclosures
Kenneth L. Marek, MD (IND) PRESENTER	Dr. Marek has received personal compensation for serving as an employee of IND. Dr. Marek has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for invicro. Dr. Marek has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Roche. Dr. Marek has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Sanofi. Dr. Marek has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Biohaven. Dr. Marek has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for takeda. Dr. Marek has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Denali. Dr. Marek has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Koneksa. Dr. Marek has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Xingimaging. Dr. Marek has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Neuron23. Dr. Marek has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Lilly. Dr. Marek has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Biohaven. Dr. Marek has received research support from Michael J Fox Foundation.
Tanya Simuni, MD, FAAN (Northwestern University Feinberg School of Medicien)	Dr. Simuni has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for cadia, AcureX, Adamas, AskBio, Amneal, Blue Rock Therapeutics, Caraway Therapeutics, Critical Path for Parkinson's Consortium (CPP), Denali, Michael J Fox Foundation, Neuroderm, Sanofi, Sinopia, Roche, Takeda and Vanqua Bio. Dr. Simuni has received personal compensation in the range of $5,000-$9,999 for serving on a Scientific Advisory or Data Safety Monitoring board for of Koneksa, Neuroderm, Sanofi, UCB, AcureX, Adamas, AskBio, Biohaven, Denali, GAIN, Neuron23 and Roche. Dr. Simuni has received research support from Amneal, Biogen, Neuroderm, Prevail, Roche, and UCB and an investigator for NINDS, MJFF, Parkinson's Foundation.
Andrew D. Siderowf, MD	Dr. Siderowf has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Biogen. Dr. Siderowf has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Mitsubishi. Dr. Siderowf has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Boehringer-Ingelheim. Dr. Siderowf has received personal compensation in the range of $500-$4,999 for serving as a Consultant for askbio. Dr. Siderowf has received personal compensation in the range of $500-$4,999 for serving as a Consultant for capsida. Dr. Siderowf has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Parkinson Study Group. Dr. Siderowf has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Theravance. Dr. Siderowf has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Neurocrine. Dr. Siderowf has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Prilenia. Dr. Siderowf has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Wave. Dr. Siderowf has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Neurogastrix. Dr. Siderowf has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Prevail. Dr. Siderowf has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Alerity. Dr. Siderowf has received personal compensation in the range of $10,000-$49,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Clintrex. Dr. Siderowf has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Inhibikase. Dr. Siderowf has a non-compensated relationship as a Scientific Advisory Board with NeuroPacs that is relevant to AAN interests or activities.
	No disclosure on file
	No disclosure on file
Christopher Coffey, PhD, FAAN (University of Iowa)	Dr. Coffey has received personal compensation in the range of $5,000-$9,999 for serving as an Editor, Associate Editor, or Editorial Advisory Board Member for American Heart Association. The institution of Dr. Coffey has received research support from NIH. The institution of Dr. Coffey has received research support from Michael J Fox Foundation.
Brit Mollenhauer	No disclosure on file
Caroline M. Tanner, MD, PhD, FAAN (University of California San Francisco, Weill Institute for Neurosciences)	Dr. Tanner has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Evidera. Dr. Tanner has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Neurocrine. Dr. Tanner has received personal compensation in the range of $5,000-$9,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Jazz Pharmaceuticals/Cavion. Dr. Tanner has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Bial . Dr. Tanner has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Supernus. Dr. Tanner has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Roche Genentech. The institution of Dr. Tanner has received research support from Gateway LLC. The institution of Dr. Tanner has received research support from Roche\Genentech. The institution of Dr. Tanner has received research support from Michael J Fox Foundation . The institution of Dr. Tanner has received research support from National Institute of Health . The institution of Dr. Tanner has received research support from Department of Defense. Dr. Tanner has received personal compensation in the range of $500-$4,999 for serving as a Faculty, CME presentation with Medscape /WebND.
Karl D. Kieburtz, MD (University of Rochester Medical Center)	Dr. Kieburtz has received personal compensation for serving as an employee of Clintrex Research Corporation. Dr. Kieburtz has received personal compensation in the range of $5,000-$9,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Roche. Dr. Kieburtz has received personal compensation in the range of $5,000-$9,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Lilly. Dr. Kieburtz has received personal compensation in the range of $5,000-$9,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Janssen. Dr. Kieburtz has stock in Clintrex Research Corp. Dr. Kieburtz has stock in Hoover Brown. An immediate family member of Dr. Kieburtz has stock in Hoover Brown. Dr. Kieburtz has stock in Safe Therapeutics. The institution of Dr. Kieburtz has received research support from NIH. The institution of Dr. Kieburtz has received research support from Michae J Fox Foundation.
Lana Chahine, MD, FAAN	Dr. Chahine has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Gray Matters Technology. The institution of Dr. Chahine has received research support from UPMC. The institution of Dr. Chahine has received research support from MJFF. The institution of Dr. Chahine has received research support from Denali/Biogen. Dr. Chahine has received publishing royalties from a publication relating to health care.
John P. Seibyl, MD	Dr. Seibyl has received personal compensation in the range of $50,000-$99,999 for serving as a Consultant for Invicro. Dr. Seibyl has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Biogen. Dr. Seibyl has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Life Molecular Imaging. Dr. Seibyl has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Roche. Dr. Seibyl has received stock or an ownership interest from Invicro.

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