Study of Urate Elevation in Parkinson's Disease, Phase 3

Summary

A multicenter, randomized, double-blind, placebo-controlled, phase 3 trial to determine whether oral inosine dosed to moderately elevate serum urate (from ≤5.7 mg/dL to 7.1-8.0 mg/dL) over 2 years slows clinical decline in early PD. Clinical decline will be assessed as change in the primary outcome variable of the Movement Disorders Society-Unified Parkinson's Disease Rating Scale (MDS-UPDRS), a composite scale comprising patient- and clinician-reported outcomes.

Timeline

Start

2016-06

Primary completion

2019-06

Completion

2019-06

Outcome

Missed primary endpoint

registry analysis (other test); Inosine vs Placebo; p = 0.183; Slope 1.256 (95% CI -0.594 to 3.106); Mixed Models Analysis NCT02642393 ↗

paper did not result in a significant difference in the rate of clinical disease progression. PMID 34519802 ↗

Publications

• Background Parkinson Study Group SURE-PD Investigators; Schwarzschild MA, Ascherio A, Beal MF, Cudkowicz ME, Curhan GC, Hare JM, Hooper DC, Kieburtz KD, Macklin EA, Oakes D, Rudolph A, Shoulson I, Tennis MK, Espay AJ, Gartner M, Hung A, Bwala G, Lenehan R, Encarnacion E, Ainslie M, Castillo R, Togasaki D, Barles G, Friedman JH, Niles L, Carter JH, Murray M, Goetz CG, Jaglin J, Ahmed A, Russell DS, Cotto C, Goudreau JL, Russell D, Parashos SA, Ede P, Saint-Hilaire MH, Thomas CA, James R, Stacy MA, Johnson J, Gauger L, Antonelle de Marcaida J, Thurlow S, Isaacson SH, Carvajal L, Rao J, Cook M, Hope-Porche C, McClurg L, Grasso DL, Logan R, Orme C, Ross T, Brocht AF, Constantinescu R, Sharma S, Venuto C, Weber J, Eaton K. Inosine to increase serum and cerebrospinal fluid urate in Parkinson disease: a randomized clinical trial. JAMA Neurol. 2014 Feb;71(2):141-50. doi: 10.1001/jamaneurol.2013.5528.
• Di Luca DG, Macklin EA, Hodgeman K, Lopez G, Pothier L, Callahan KF, Lowell J, Chan J, Videnovic A, Lungu C, Lang AE, Litvan I, Schwarzschild MA, Simuni T. Enrollment of Participants From Marginalized Racial and Ethnic Groups: A Comparative Assessment of the STEADY-PD III and SURE-PD3 Trials. Neurol Clin Pract. 2023 Feb;13(1):e200113. doi: 10.1212/CPJ.0000000000200113. Epub 2023 Jan 18.
• Parkinson Study Group SURE-PD3 Investigators; Schwarzschild MA, Ascherio A, Casaceli C, Curhan GC, Fitzgerald R, Kamp C, Lungu C, Macklin EA, Marek K, Mozaffarian D, Oakes D, Rudolph A, Shoulson I, Videnovic A, Scott B, Gauger L, Aldred J, Bixby M, Ciccarello J, Gunzler SA, Henchcliffe C, Brodsky M, Keith K, Hauser RA, Goetz C, LeDoux MS, Hinson V, Kumar R, Espay AJ, Jimenez-Shahed J, Hunter C, Christine C, Daley A, Leehey M, de Marcaida JA, Friedman JH, Hung A, Bwala G, Litvan I, Simon DK, Simuni T, Poon C, Schiess MC, Chou K, Park A, Bhatti D, Peterson C, Criswell SR, Rosenthal L, Durphy J, Shill HA, Mehta SH, Ahmed A, Deik AF, Fang JY, Stover N, Zhang L, Dewey RB Jr, Gerald A, Boyd JT, Houston E, Suski V, Mosovsky S, Cloud L, Shah BB, Saint-Hilaire M, James R, Zauber SE, Reich S, Shprecher D, Pahwa R, Langhammer A, LaFaver K, LeWitt PA, Kaminski P, Goudreau J, Russell D, Houghton DJ, Laroche A, Thomas K, McGraw M, Mari Z, Serrano C, Blindauer K, Rabin M, Kurlan R, Morgan JC, Soileau M, Ainslie M, Bodis-Wollner I, Schneider RB, Waters C, Ratel AS, Beck CA, Bolger P, Callahan KF, Crotty GF, Klements D, Kostrzebski M, McMahon GM, Pothier L, Waikar SS, Lang A, Mestre T. Effect of Urate-Elevating Inosine on Early Parkinson Disease Progression: The SURE-PD3 Randomized Clinical Trial. JAMA. 2021 Sep 14;326(10):926-939. doi: 10.1001/jama.2021.10207.
• Mestre TA, Macklin EA, Ascherio A, Ferreira JJ, Lang AE, Schwarzschild MA; Parkinson Study Group SURE-PD3 Investigators. Expectations of Benefit in a Trial of a Candidate Disease-Modifying Treatment for Parkinson Disease. Mov Disord. 2021 Aug;36(8):1964-1967. doi: 10.1002/mds.28630. Epub 2021 May 4.

Drugs

Evaluation	Drug	Modality	Dose	Route
Subject	Inosine	Unknown	500 mg	Oral

Indications