A Study to Assess the Efficacy, Safety, and Pharmacokinetics of TB006 in Participants With Acute Ischemic Stroke

A Study to Assess the Efficacy, Safety, and Pharmacokinetics of TB006 in Participants With Acute Ischemic Stroke

A Phase 2 Double-blind, Randomized, Multi-center, Parallel-group Study to Assess the Efficacy, Safety, and Pharmacokinetics of TB006 in Patients With Acute Ischemic Stroke

This multi-center, randomized, parallel-group, double-blind, placebo-controlled study will evaluate the efficacy and safety of TB006 in participants with an Acute Ischemic Stroke (AIS) event with 57 days of treatment.

Participants will receive intravenous (IV) 3 infusions of 4000 milligrams (mg) TB006, one every 28 days (Q28D).

Percentage of Participants with Recovery Success Measured by modified Rankin Scale (mRS) score of 0-1 on the final mRS assessment.

The Modified Rankin Scale (mRS) measures neurological disability or dependence of participants with stroke on a scale of 0 to 6 and scores indicate the following: 0 - No symptoms; 1 - No significant disability; 2 - Slight disability; 3 - Moderate disability; 4 - Moderately severe disability; 5 - Severe disability; 6 - Dead. Higher score indicates worse condition.

Percentage of Participants with Clinically Significant Improvement on the National Institutes of Health Stroke Scale (NIHSS)

The NIHSS is composed of 11 items, each of which rates a specific parameter of ability or function. Each item is rated on a scale of 0 to 4. A score of 0 indicates normal function, with higher scores indicating greater degree of impairment. The individual item scores are added to calculate the NIHSS total score. The minimum score being a 0 (no impairment) and maximum possible score is 42 (death). Higher scores indicate worse condition.

The MoCA is a brief screening instrument designed to assess mild cognitive impairment in a variety of participant conditions. The MoCA assesses eight cognitive domains: visuospatial ability, executive function, short-term memory recall, attention, concentration, working memory, language, and orientation to time and space. Scores on the MoCA range from 0 to 30, with lower scores indicating greater impairment.

The C-SSRS is a suicidal ideation and behavior rating scale with yes/no responses. For each of the 5 items of the C-SSRS related to suicidal ideation intensity, an individual's degree of suicidal ideation is rated on a 0-5 scale with 0: no suicidal behavior and 5: active suicidal ideation. The total score is the sum of the 5 intensity item scores (total score ranges from 0 to 25). Higher scores in the scale indicate greater disease severity.

Inclusion Criteria: Body Mass Index (BMI) between 18 and 40 kilograms per meters squared (kg/m^2), inclusive Clinical diagnosis of AIS in anterior circulation, supported by evidence of a new stroke on acute brain computed tomography (CT) or magnetic resonance imaging (MRI) consistent with the clinical diagnosis. Able to be randomized and dosed within 7 days of index stroke event. The last known awake time will be used for participants whose stoke occurred during sleep. National Institute of Health Stroke Scale total score of 7 to 21, inclusive Participants may have received standard of care therapy including recombinant tissue plasminogen activator (r-tPA), thrombectomy, mannitol, hypertonic saline, and other treatments per local guidelines as determined by the Investigator. Participants who have received r-tPA within the first day of their stroke event are eligible. However, study drug administration must begin more than 24 hours following r-tPA administration. Exclusion Criteria: Evidence of severe stroke on imaging (e.g., sulcal effacement or blurring of gray-white junction in greater than 1/3 of middle cerebral artery [MCA] territory, Alberta Stroke Program Early CT [ASPECT] score of 0 to 4 based on head CT, acute infarct volume on MRI diffusion weighed imaging ≥70 mL based on acute imaging studies performed under the standard of care Lacunar or isolated brainstem or cerebellar stroke based on clinical assessment and available acute imaging studies performed under the standard of care Evidence of seizure at the onset of index stroke Evidence of acute myocardial infarction (MI) at Baseline, including any of the following: Acute ST elevation MI; Acute decompensated heart failure, or New York Heart Association Class III/IV heart failure; Admission for an acute coronary syndrome, MI, cardiac arrest, or non-voluntary coronary intervention (percutaneous coronary intervention or coronary artery surgery) within the past 3 months. QT interval corrected using Bazett's formula (QTcB) >520 milliseconds (msec). Evidence of acute intracranial or subarachnoid hemorrhage or evidence of active bleeding based on acute brain CT or MRI performed under the standard of care. However, petechial hemorrhages of ≤ 1 centimeter (cm) are not exclusionary. Note: Other protocol defined Inclusion/Exclusion criteria may apply.