Study of 50561 in Patients With Mild or Moderate Alzheimer's Disease

Overview

This is a multi-center, Phase IIa, randomized, double-blind, placebo-controlled study designed to evaluate the efficacy, safety of two doses of 50561 compared to placebo in participants diagnosed with mild to moderate Alzheimer's disease.

Eligibility

Inclusion Criteria:

1. Agree to participate and sign the informed consent form (ICF) with a legal guardian;
2. Male or female subjects aged 50-85 years (inclusive), at the time of informed consent;
3. Subjects have received education in primary school and above and are able to complete protocol specified cognitive ability test and other tests;
4. Meets the National Institute on Aging -Alzheimer's Association (NIA-AA) core clinical criteria (2011) for probable Alzheimer's disease (AD) dementia;
5. Impaired memory for at least 12 months, with a tendency of progressive aggravation;
6. Treatment-naive subjects for Alzheimer's disease (AD);
7. Mild to moderate Alzheimer's disease (AD):

        (1) Mini-Mental State Examination (MMSE) score of ≥ 11 and < 26 (2) Clinical Dementia
        Rating-Global Score (CDR-GS) of 1 or 2;
        8. Hachinski Ischemic Scale (HIS) score of ≤ 4;
        9. Hamilton Depression Rating Scale (HAMD) (17-item version) score of ≤ 10;
        10. Cranial magnetic resonance imaging (MRI) plain scan and oblique coronal hippocampal
        scan:
          1. Age-adjusted medial temporal lobe atrophy scale [MTA scale] score: Score 2 or more for
             < 75 years, score 3 or more for ≥ 75 years;
          2. Infarction lesions larger than 2 cm in diameter ≤ 2
          3. Without infarction lesion in vital sites, such as the thalamus, hippocampus,
             entorhinal cortex, paraolfactory cortex, angular gyrus, cortex, and other subcortical
             gray matter nuclei;
          4. Fazekas Scale ≤ 2.
        11. If female with childbearing potential, tests negative for pregnancy at screening and
        baseline visits. Male and female patients with childbearing potentials agree to use
        contraceptives with an annual failure rate of < 1% throughout the trial and for 90 d after
        the last dose;
        12. Subject shall have a stable and reliable caregiver who provides care for at least 2 h
        per day for 4 d per week. The caregiver must accompany the subject in all visits and have
        sufficient interaction and communication with the subject in order to assist the
        investigator in completing the relevant assessments.
        Exclusion Criteria:
          1. Dementia caused by other reasons: Vascular dementia, central nervous system infection
             (e.g., AIDS, syphilis), Creutzfeldt-Jakob disease, Huntington's disease, Parkinson's
             disease, Lewy body dementia, brain trauma dementia, other physical and chemical
             factors (e.g., drug poisoning, alcohol poisoning, carbon monoxide poisoning),
             important corporeal diseases (e.g., hepatic encephalopathy, pulmonary encephalopathy),
             intracranial space-occupying lesions (e.g., subdural hematoma, brain tumors),
             endocrine system disorders (e.g., thyroid disease, parathyroid disease ) and dementia
             due to vitamin deficiency or any other known causes;
          2. Previously had/currently has nervous system disorder (including Neuromyelitis optica,
             Parkinson's disease, epilepsy);
          3. Mental disorders confirmed according to the Diagnostic and Statistical Manual of
             Mental Disorders, Fifth Edition (DSM-5), including schizophrenia or other mental
             illness, bipolar disorder, major depression, or delirium;
          4. Laboratory test abnormalities at screening visit and baseline: Liver function (alanine
             aminotransferase [ALT] and aspartate aminotransferase [AST]) > 2-fold the upper limit
             of normal (ULN); Kidney function (creatinine [Cr]) > 1.5-fold the ULN; Creatine kinase
             (CK) > 2-fold the ULN; Patients with values that slightly exceed these ranges but are
             not clinically significant may be included as assessed by the investigator;
          5. Presence of any one of the following infections at the screening visit:
        (1) Positive for hepatitis B surface antigen (HBsAg) and/or hepatitis B core antibody
        (HBcAb) and positive for hepatitis B virus deoxyribonucleic acid (HBV-DNA) (exceeding the
        upper limit of the normal range of the study site); (2) Positive for anti-hepatitis C virus
        (HCV) antibody (Ab); (3) Positive for human immunodeficiency virus (HIV) Ab; (4) Positive
        for Treponema pallidum (TP) Ab;
        6. Presence of other active and poorly managed systemic bacterial, viral, fungal, or
        parasitic infections (except for fungal nail infection) at the screening visit, or other
        clinically significant active infections that render the subject unsuitable for study
        participation as assessed by the investigator;
        7. Systolic blood pressure (SBP) ≥ 160 mmHg or < 90 mmHg or diastolic blood pressure (DBP)
        ≥ 100 mmHg or < 60 mmHg at the screening visit and baseline; Patients with SBP or DBP that
        slightly exceed this range but is not clinically significant may be included as assessed by
        the investigator;
        8. Prolonged corrected QTc interval (Fridericia formula, Appendix 14.1) in the 12-lead
        electrocardiography (ECG) at screening visit and baseline: Fridericia corrected QT interval
        (QTcF) > 450 ms for males and > 470 ms for females or other clinically significant ECG
        abnormalities that render the subject unsuitable for study participation (e.g., heart rate
        < 50 beats/min, sinus node dysfunction, Mobitz II or third-degree atrioventricular block);
        9. Patients with unstable or severe cardiovascular, respiratory, digestive, urinary,
        hematologic, or endocrine disorders within 6 months prior to the screening visit, including
        pancreatitis, severe/unstable angina, myocardial infarction, symptomatic congestive heart
        failure, life-threatening ventricular arrhythmia requiring maintenance therapy, pulmonary
        hypertension, respiratory failure, previous hypoglycemia coma, unstable blood glucose
        control in diabetic patients, and stroke (including transient ischemic attack), and are
        unsuitable for study participation as assessed by the investigator;
        10. Presence of gastrointestinal disorder that, as assessed by the investigator, can impact
        drug absorption or metabolism within 6 months prior to the screening visit;
        11. Underwent major surgery within 6 months prior to the screening visit that renders the
        patient unsuitable for enrollment or planning to undergo major surgery during the study;
        12. Suffered from a malignant tumor within 3 years prior to the screening visit (excluding
        resected basal cell carcinoma or cutaneous squamous cell carcinoma , and/or resected
        carcinoma in situ);
        13. Received other traditional Chinese or Western nootropic medications/treatments within 4
        weeks prior to baseline;
        14. Use of strong CYP3A4 inhibitor or strong CYP3A4 inducer within 4 weeks or 5 half-lives
        (whichever is longer) prior to baseline;
        15. Received other investigational drugs within 4 weeks prior to baseline;
        16. Received vaccines within 4 weeks prior to baseline;
        17. Alcohol abuse or drug abuse within 1 year prior to the screening visit;
        18. History of severe allergy, non-allergic drug reaction or multiple drug allergy, or
        known history of allergy to 50561 tablet and its excipients;
        19. Lacks adequate premorbid literacy, adequate vision, or adequate hearing to complete the
        required psychometric tests;
        20. Breastfeeding women;
        21. Other conditions that render the subject unsuitable for study participation as assessed
        by the investigator.