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Disease-modifying Efficacy of Sitagliptin Therapy in Early-stage Parkinson's Disease

NCT07804381 · Status: NOT_YET_RECRUITING · Phase: PHASE2 · Type: INTERVENTIONAL · Enrollment: 160

Last updated 2026-09-04

No results posted yet for this study

Summary

Parkinson's disease (PD) is a progressive neurodegenerative disorder pathologically characterized by the loss of dopaminergic neurons in the substantia nigra pars compacta and the accumulation of α-synuclein (α-syn) aggregates. To date, all approved treatments, including levodopa, are primarily limited to symptomatic relief, and no disease-modifying therapy (DMT) has been established to fundamentally slow or halt disease progression.

Large-scale epidemiological cohort studies conducted in Taiwan, Sweden, the United Kingdom, and other countries have consistently reported that, among patients with diabetes, DPP-4 inhibitor users had an approximately 30%-40% lower risk of developing Parkinson's disease compared with non-users.

This study aims to evaluate whether 72 weeks of treatment with sitagliptin (100 mg once daily), compared with placebo, delays the time to confirmed motor progression in patients with early-stage PD receiving stable levodopa monotherapy. Confirmed motor progression is defined as an increase of ≥5 points from baseline in the Movement Disorder Society-Unified Parkinson's Disease Rating Scale (MDS-UPDRS) Part III score assessed in the OFF state.

Conditions

  • Parkinson Disease

Interventions

DRUG

Sitagliptin

Sitagliptin 100 mg, one tablet orally once daily, with or without food, for 72 weeks.

DRUG

Sitagliptin placebo

One placebo tablet orally once daily, with or without food, for 72 weeks. (The placebo will be manufactured to be indistinguishable from the investigational product in terms of appearance, color, size, and weight in order to maintain blinding.)

Sponsors & Collaborators

  • Yonsei University

    lead OTHER

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
TRIPLE
Model
PARALLEL

Eligibility

Min Age
50 Years
Max Age
80 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2026-12-15
Primary Completion
2029-03-01
Completion
2029-04-01

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07804381 on ClinicalTrials.gov