Evidence map›Paper›PMID 32501582›Full record

ArticleMovement disorders : official journal of the Movement Disorder Society2020

A Pooled Analysis From Phase 2b and 3 Studies in Japan of Istradefylline in Parkinson's Disease.

Nobutaka Hattori, Hiroki Kitabayashi, Tomoyuki Kanda, Takanobu Nomura, Keizo Toyama, Akihisa Mori

Open access · hybridAbstract read
In one paragraph

Article in Movement disorders : official journal of the Movement Disorder Society, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.

0numbers the graph read from it
0cells of the map it votes in
10citing papers in PubMed
1.0field-weighted citation impact, top 20% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

10 citing papers in PubMed, 16 citations in OpenAlex.

  1. From danger to resolution: targeting purinergic signaling in CNS diseases.Medicinal chemistry research : an international journal for rapid communications on design and mechanisms of action of biologically active agents · 2026
    Review
  2. Article
  3. Novel and experimental therapeutics for the management of motor and non-motor Parkinsonian symptoms.Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology · 2024
    Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors at 3 institutions in 2 countries.

Nobutaka HattoriDepartment of Neurology, Juntendo University School of Medicine, Tokyo, Japan.
Hiroki KitabayashiMedical Affairs Department, Kyowa Kirin Co., Ltd., Tokyo, Japan.
Tomoyuki KandaMedical Affairs Department, Kyowa Kirin Co., Ltd., Tokyo, Japan.
Takanobu NomuraMedical Affairs Department, Kyowa Kirin Co., Ltd., Tokyo, Japan.
Keizo ToyamaR&D Division, Kyowa Kirin Co., Ltd., Tokyo, Japan.
Akihisa MoriMedical Affairs Department, Kyowa Kirin Co., Ltd., Tokyo, Japan.
Kyowa Kirin (Japan) · JPJuntendo University · JPKyowa Kirin (France) · FR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundCharacterization of patient factors associated with istradefylline efficacy may facilitate personally optimized treatment.

objectivesWe aimed to examine which patient factors are associated with favorable istradefylline treatment outcomes in PD patients with motor complications.

methodsWe performed a pooled analysis of data from two identical phase 2b and 3 Japanese studies of istradefylline. Logistic regression models were used to assess the association of 12 patient characteristics with favorable outcomes.

resultsOff time reduction and increased good on time with istradefylline provided a significantly favorable response in patients aged ≥65 years. Off time reduction was more favorable in patients with ≥8-hour daily off time at baseline. Improvement in UPDRS Part III was favorable in patients with UPDRS Part III baseline score ≥ 20.

conclusionsSeveral patient factors influenced the effect of istradefylline on motor fluctuations, motor function, activities of daily living, and clinical impression. © 2020 The Authors. Movement Disorders published by Wiley Periodicals, Inc. on behalf of International Parkinson and Movement Disorder Society.

Indexed as

Parkinson DiseaseActivities of Daily LivingAdenosine A2 Receptor AntagonistsAgedHumansJapanPurinesTreatment OutcomeAdenosine A2 Receptor AntagonistsistradefyllinePurinesefficacyistradefyllineJapanParkinson's diseasetreatment outcome

Identifiers

PMID32501582
PMCPMC7496465
OpenAlexW3033371162

What OpenQuestion holds

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LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.