Safety and Preliminary Efficacy of NXL-001 in Patients with Ischemic Stroke

Early Phase 1

Not yet recruiting

• Conditions: Ischemic Stroke

• Registration Number: NCT06761183
• Lead Sponsor: Beijing Tiantan Hospital

Brief Summary

This is a single-arm, open-label, single center, dose-escalation exploratory clinical study to evaluate the safety and tolerability of a single intracerebral injection of NXL-001, a NeuroD1 base gene therapy, in patients with chronic neuronal deficits from ischemic stroke.

Detailed Description

The death of neurons after stroke is the direct cause of brain function loss, and the difficulty of neurons to regenerate themselves in the adult brain is an important reason for the lack of effective treatment for stroke. Replacing the lost neurons and then reconstructing the functional connectivity between neurons is the key to improving stroke symptoms. NXL-001 is a gene therapy, using an AAV9 (adeno-associated virus 9) vector to deliver and express the neurodevelopmental transcription factor NeuroD1 to directly convert astrocytes into functional neurons. NXL-001 has been shown to regenerate neurons and improve motor function when administered in animal models of stroke. The primary objective of this single-arm, open-label, single center, dose-escalation study is to evaluate the safety and tolerability of intracerebral stereotactic injection of NXL-001. The secondary objective is to preliminarily evaluate the efficacy of NXL-001 in patients with chronic neuronal deficits from ischemic stroke and to determine its safe and effective dose range. This dose escalation study involves three cohorts, with 3 subjects in each group to receive a single stereo-tactically intracerebral injection of NXL-001 at escalating doses.

Study Timeline

• Status Verified: 2024-12
• Study First Submitted: 2024-12-27
• Study First Submitted QC: 2024-12-30
• Last Update Submitted: 2024-12-30
• Study First Posted: 2025-01-07
• Last Update Posted: 2025-01-07
• Study Start: 2025-01-31
• Primary Completion: 2026-12-31
• Study Completion: 2026-12-31

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 9

Inclusion Criteria

• Age 40-75 years, inclusive, gender is not limited.
• Clinical diagnosis of ischemic stroke confirmed by neuro-imaging（CT , MRI，et al）.
• 2-4 months after the onset of ischemic stroke.
• MRI scan shows that the stroke lesion is 20-80ml in size, with cerebral motor cortex injury, and DTI shows corticospinal tract injury.
• Persisting moderate to severe motor function impairment due to stroke after standardized and guide-recommended rehabilitation therapy, characterized by baseline NIHSS score of 6-20 points, and a motor score of 3-4 on the affected upper or lower limb.
• Expected survival ≥ 12 months.
• The patient or his/her legal representative clearly understands, voluntarily participates in the study and signs the informed consent form.
• The subject is willing and able to return for follow-up visits as required by the trial protocol.
• Able to undergo rehabilitation training and treatment;
• Male and female subjects participating in the clinical study must agree to use an adequate birth control method for at least 6 months after administration

Exclusion Criteria

• Motor deficit due to ischemic stroke of posterior circulation.
• Motor deficit due to any other causes.
• History of epilepsy.
• History of encephalitis, meningitis, multiple sclerosis or other central nervous system infections.
• History of intracranial hemorrhage and subarachnoid hemorrhage.
• History of severe head trauma within the past 5 years.
• Any contraindications to MRI scanning (such as implanted pacemaker, infusion pump etc.).
• Serum anti-AAV9 antibody titers ≥ 1:100
• History of malignant tumors within 5 years before screening (except for adequately treated cervical carcinoma in situ, papillary thyroid cancer, basal cell or squamous epithelial cell skin cancer, localized prostate cancer after radical surgery, and breast ductal carcinoma in situ).
• Active infections, including but not limited to human immunodeficiency virus (HIV), hepatitis A, B or C, syphilis, etc.
• Received any investigational drugs within 3 months (or 5 half-lives of the investigational drug, whichever is longer) of initial screening.
• Received any other cell and/or gene therapy for stroke.
• Requirement for anticoagulants.
• Intermittent use of oral anti-spasticity medications (stop/start date from 1-month prior-to and 3-month post- NXL-001 administration). Use of oral anti-spasticity medications are acceptable if they have been taken regularly for at least one month prior to NXL-001 administration).
• Pregnant or lactating female subjects.
• Insufficient reserved functions of liver, kidney and bone marrow: Neutrophil count <1,500/mm 3 ; platelets <100, 000/mm 3 ; hemoglobin <9.0 g/dL; serum creatinine >1.5 times the upper limit of normal range (ULN) ; renal function eGFR < 60mL/min/ 1.73m2 ; Bilirubin, aspartate aminotransferase (AST) and alanine aminotransferase (ALT) >2.5 times ULN; activated partial prothrombin time ( APTT ) or international normalized ratio ( INR ) >1.3 times ULN.
• Poorly controlled illness judged by the investigator at screening, including cardiovascular system (decompensated heart failure (NYHA classification III and IV), unstable angina, acute myocardial infarction), Respiratory system, digestive system, endocrine metabolic system, neuropsychiatric system, blood system and immune system diseases, etc.
• Based on medical history and investigator's judgment, the subject is at significant risk of suicide.
• In the investigator's judgment, the subject has any other factors deemed inappropriate for participation in this trial.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SEQUENTIAL

Primary Outcome Measures

Name	Time	Method
Safety and tolerability of NXL-001	baseline to month 3 after dose	Incidence of adverse events (AE) and serious adverse events (SAE) according to CTCAE 5.0

Secondary Outcome Measures

Name	Time	Method
Change in MRI images from baseline at month 12	Baseline (Screening), and on day 7, month 1,3,6 and 12 after dose	Changes in MRI images of cerebral infarction areas before and after treatment
Change in PET images from baseline at month 12	Baseline (Screening), and at month 3 and 12 after dose	Changes in PET images will be used to assess metabolic changes in the infarct and its surrounding area before and after treatment
Change in the National Institutes of Health Stroke Scale (NIHSS) Total Score from baseline to month 12	Baseline (Screening), and on day1, 7, and at month 1,3,6 and 12 after dose	The NIHSS is a standardized method used to measure the level of impairment caused by a stroke. The scale consists of 11 items that measure several aspects of brain function, including consciousness, vision, sensation, movement, speech, and language. A certain number of points are given for each impairment uncovered during a focused neurological examination. A maximal score of 42 represents the most severe and devastating stroke with 0=no stroke, 1-4=minor stroke, 5-15=moderate stroke, 15-20=moderate/severe stroke, and 21-42=severe stroke.
Change in the Modified Rankin Scale (mRS) Response from Baseline to Month 12	Baseline (Screening), and on day1, 7, and at month 1,3,6 and 12 after dose	The mRS is a commonly used scale for measuring the degree of disability in daily activities for patients who have suffered a stroke. The mRS is an ordinal scale from 0 (no symptoms at all) to 5 (severe disability; requiring constant nursing care and attention, bedridden, incontinent) with a sixth category of death.
Change in the Fugl-Meyer Assessment (FMA) from Baseline to Month 12	Baseline (Screening), and at month 1,3,6 and 12 after dose	The FMA is used as a clinical measure of body function impairment after stroke that assesses several dimensions of motor impairment, including range of motion in upper and lower limbs, reflex activity, volitional movement, and coordination.The Fugl-Meyer motor total score ranged from 0 (hemiplegia) to a maximum of 100 points (normal motor performance), and is comprised of a 33-item upper extremity subscale (UE-FMMS) and the 17-item lower extremity subscale (LE-FMMS). Items were scored on a 3-point ordinal scale: 0= cannot perform; 1= partial motion; 2= full motion Individual items are summed to determine scores for the 2 subscale scores, as well as a motor total score (total of the 2 subscales UE-FMMS and LE-FMMS). As a result, the UE-FMMS subscale score ranged from 0 to 66 and the LE-FMMS subscale score ranged from 0 to 34. A maximally affected person will have a score of 0 while a fully functional person will have the highest score (i.e., 34 for LE-FMMS, 66 for UE-FMMS, 100 for FMM)
Change in the modified Ashworth Scale from baseline to month 12	Baseline (Screening), and at month 1,3,6 and 12 after dose	The Modified Ashworth Scale (MAS) is the most commonly used clinical scale to measure hypertonic or spastic muscle. The scale ranges from 0 to 4, with the muscle acting across the joint rated based on what point during flexion or extension resistance or a catch is noted. A score of 0 indicates no resistance to passive movement, with a 4 indicating a rigid joint.
Change in the gait function scale from baseline to month 12	Baseline (Screening), and at month 1,3,6 and 12 after dose	The gait function scale consists of 4 items that measure several aspects of gait function quantitatively and semi-quantitatively, including balance, Six-meter Walk test, Tandem walking test, and Quick sit-up test.
Change in the Action Research Arm Test (ARAT) from baseline to month 12	Baseline (Screening), and at month 1,3,6 and 12 after dose	The Action Research Arm Test (ARAT) is a 19-item observational measure to assess upper extremity performance (coordination, dexterity and functioning) in stroke recovery, brain injury and multiple sclerosis populations. Items comprising the ARAT are categorized into four subscales (grasp, grip, pinch and gross movement) and arranged in order of decreasing difficulty, with the most difficult task examined first, followed by the least difficult task. Each item is rated 4 (0-3 points), 0 = no movement；1= movement task is partially performed；2 = movement task is completed but takes abnormally long；3 = movement is performed normally. Scores on the ARAT may range from 0-57 points, with a maximum score of 57 points indicating better performance.
Change in the EQ-5D-5L scale from baseline to month 12	Baseline (Screening), and at month 1,3,6 and 12 after dose	The EQ-5D, EuroQol Five Dimensions Questionnaire, is a set of standardized scales measuring health status. The EQ-5D-5L descriptive system consists of five dimensions (each describing a specific aspect of health): mobility, self-care, daily activities, pain or discomfort, anxiety or depression. Each dimension has five response levels: no problems, slight problems, moderate problems, severe problems, unable to/extreme problems. The respondent is asked to indicate his/her health state by checking the box next to the most appropriate response level for each of the five dimensions.
Change in the Electroencephalogram（EEG）from baseline to month 12	Baseline (Screening), and at month 1,3,6 and 12 after dose	EEG is a simple, low-cost, non-invasive tool that can provide information about the changes occurring in the cerebral cortex during the recovery process after stroke. EEG provides data on the evolution of cortical activation patterns.
Change in the Motor-evoked potential (MEP) from baseline to month 12	Baseline (Screening), and at month 1,3,6 and 12 after dose	Motor evoked potential (MEP) amplitude and threshold are predictors of functional outcome in the early stages after stroke, and improvement in these parameters usually accompanies motor recovery.

Trial Locations

Locations (1)

Beijing Tiantan Hospital; 🇨🇳 Beijing, Beijing, China