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Acute Large Hemispheric Infarction StrokePhase 2NCT07203521

RK-4 Intracalvariosseous Injection in Treatment of Acute Large Hemispheric Infarction

A Phase 2 study testing RK-4 injection and conventional treatment in people with Acute Large Hemispheric Infarction Stroke and Transcranial Bone Marrow Injection, run by Fuzhou Neurodawn Rongkang Pharmaceutical Co., Ltd.

Not yet recruiting

Opening soon. The study is approved but enrolment has not started yet. Sites may already take enquiries.

Sites and contacts
Official record
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Trial summary

An open-label, blinded phase II study investigating the treatment of acute large hemispheric infarction by transcranial bone marrow injection of RK-4 injection For subjects with acute large hemispheric infarction who are contraindicated to vascular recanalization or have poor response to vascular recanalization… Read more about this study

Who is it for?
Ages 18 to 80 years
What is being tested?
RK-4 injection and conventional treatment
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
194 participants
Where
No sites listed yet
Study dates
1 Nov 2025to 7 Oct 2026
Phase
Phase 2
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 80 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • 1. 18≤ age < 81 years old, gender is not limited; 2. The modified Rankin score (mRS) score ≤ 1 point before the onset of stroke; 3. Administration can be completed within 24 hours after the onset of symptoms and signs of neurological deficit (for subjects with stroke after waking up or stroke without witnesses, the last normal time of symptom onset is the time of symptom onset); 4. Clinical symptoms, signs and imaging diagnosed as cerebral infarction in the middle cerebral artery blood supply area, and the following characteristics are met:
  • 16≤NIHSS score ≤32 points, sum of the fifth upper limb and sixth lower limb scores≥6;
  • Imaging suggests the core area of infarction: cerebral blood flow (CBF) in electronic computed scan perfusion imaging (CTP) < 30% volume or apparent diffusion coefficient (ADC) value in magnetic resonance imaging (MRI) diffusion-weighted imaging (DWI) sequence < 70-300ml of 620×10-6mm2/s lesion volume or ASPECTS score of 0-6 points. Priority is given to CTP test results. If both CTP and DWI are completed during the screening period and the examination results are inconsistent, the investigator needs to take all information (scanning time, imaging method for optimal response infarct size, etc.) into account and then make a reasonable judgment and record that; ASPECTS scores can be based on CTP or MRI, but CTP is preferred. 5. If vascular reperfusion therapy is performed, the treatment is not effective and the following conditions are met:
  • <!-- -->
  • Extended thrombolytic grading (eTICI) = 2a;
  • NIHSS score did not improve or progressed after vascular reperfusion treatment and the total score was still ≤ 32 points. Note: A decrease of 1 point or more is an improvement, and an increase of 1 point or more is progress. 6. Subjects or their legal representatives voluntarily sign the informed consent form.

Who cannot join

  • Those who meet one of the following items at screening cannot be enrolled:
  • Concurrent cerebrovascular disease meets one of the following conditions:
  • Combined with acute cerebral hemorrhage and subarachnoid hemorrhage;
  • Combined with acute posterior circulation cerebral infarction, or severe posterior circulation vascular stenosis (>70%);
  • Imaging suggests bilateral involvement of the cerebral infarction area;
  • The cause has been diagnosed by TOAST typing before screening, and other etiologies such as intracranial artery dissection, vasculitis, and moyamoya disease have been identified
Show all 25Show fewer
  • Hemorrhage transformation in the infarct area, the hematoma area ≥ 30% of the infarcted area, and has an obvious mass occupancy effect;
  • Presence of clinical signs of cerebral herniation, e.g., unilateral or bilateral pupil dilation, fixation; Cerebral edema-related loss of consciousness (NIHSS 1a>2 points), or other brainstem reflex loss judged by the investigator caused by cerebral edema or cerebral herniation formation; or other unstable signs of vital signs that are difficult to control;
  • Planned cranial decompression flap decompression at screening;
  • Refractory hypertension (systolic blood pressure >200mmHg or diastolic blood >110mmHg) or hypotension (systolic blood pressure <70mmHg or diastolic blood pressure <50mmHg) that is difficult to control with medication;
  • Abnormal blood glucose (random venous blood glucose < 2.8mmol/L or >23mmol/L);
  • Obvious abnormal liver function indicators or obvious abnormal renal function indicators; Note: Obvious abnormalities in liver function indicators refer to serum alanine aminotransferase (ALT) or aspartate aminotransferase (AST) > 3 times the upper limit of normal (ULN); Significant abnormal renal function measures are defined as eGFR less than 60 mL/min/1.73 m² (eGFR is calculated using the CKD-EPI formula).
  • Acute ST-segment elevation myocardial infarction (MI), and/or acute decompensated heart failure (according to New York College of Cardiology (NYHA) cardiac function class III and IV) within the past 3 months];
  • Contraindications to transcranial bone marrow administration, such as skull fracture, skull infection, subdural/external hematoma, subscalp hematoma, scalp skin or subcutaneous infection, cranial plate obstruction in the past 3 months, etc.;
  • Bleeding tendency that is not conducive to operation in the opinion of the investigator, including but not limited to: platelet count <100×109/L, presence of coagulation dysfunction diseases such as hemophilia, etc.;
  • Presence of severe or very severe anemia (hemoglobin < 60 g/L);
  • Combined with severe respiratory diseases (severe chronic obstructive pulmonary disease, respiratory failure, etc.) that need to be corrected by endotracheal intubation, tracheostomy or ventilator;
  • Subjects have severe local or systemic infections within 3 days before screening, including but not limited to severe local symptoms due to infection, such as suppuration, severe pain, tissue necrosis, or clear systemic infection-related symptoms, such as rapid onset of high fever (>38.5°C), rapid heart rate, chills, impaired consciousness, dyspnea, shock, etc. caused by infection;
  • Diagnosed serious CNS degenerative diseases, such as Alzheimer's disease (AD), Parkinson's disease (PD) and severe dementia caused by various reasons or mental system diseases (such as schizophrenia, depression, etc.);
  • Previously diagnosed with severe systemic disease, with an expected survival of < 90 days;
  • Known allergy to any component of the treatment drug and contrast agent during the study process;
  • Subjects who are pregnant, lactating, or have possible pregnancy and plan to become pregnant;
  • Subjects are unable to comply with the study protocol or follow-up requirements;
  • Those who have participated in any other interventional clinical trial within 3 months before screening, or are currently participating in any other clinical trial;
  • The investigator believes that he is not suitable to participate in this clinical study. After enrollment, if the subject is found to have violated the enrollment criteria or met the exclusion criteria; such as the age is found to be greater than or equal to 81 years old or malignant tumors or other aspects that do not meet the inclusion criteria, the investigator can judge whether it is suitable to continue to participate in the study based on the risks and benefits.

Trial locations and contacts

No sites are listed yet. Contact the study team or a site near you to ask about taking part.

yilong wang contact

13911666571

yilong528@aliyun.com

About this study

Official title: An Open-label, Blinded Phase II Study Investigating the Treatment of Acute Large Hemispheric Infarction by Transcranial Bone Marrow Injection of RK-4 Injection

An open-label, blinded phase II study investigating the treatment of acute large hemispheric infarction by transcranial bone marrow injection of RK-4 injection For subjects with acute large hemispheric infarction who are contraindicated to vascular recanalization or have poor response to vascular recanalization therapy, the safety, tolerability, and PK characteristics of RK-4 injection injected into the brain cell marrow through the cranial bone marrow will be preliminarily evaluated, and the efficacy will be preliminarily explored. The main questions it aims to answer are:

  • The efficacy of RK-4 injection injected into the brain cell marrow through the cranial bone marrow.
  • If drug RK-4 is safe and tolerate in the patients with LHI? Researchers will analyze data from different groups, includes cranial administration group and conventional treatment group , to see efficacy of RK-4 injection injected into the brain cell marrow through the cranial bone marrow and If drug RK-4 is safe and tolerate in the patients with LHI .
Read more

Participants will:

  • Take drug RK-4 (2mg/mL, 1mL) by transcranial bone marrow injection once daily for consecutive 3 days or just receive conventional treatments.
  • Truthfully provide medical history and "previous participation in clinical trials" and a statement of no history of mental disorders.
  • Take the drug at the specified time every day according to the dosage prescribed by the doctor
  • Receive the investigational drug as instructed by the doctor and visiting as required
  • Tell the investigators about any medications (including chemicals, biological drugs, proprietary Chinese medicines, etc.) and related treatments you take during the study
  • unpermitted stop the investigational drug yourself at the end of the study or when you decide to withdraw from the study, you need to stop the investigational drug as directed by your doctor to ensure your safety
  • take reasonable contraception actions
  • unallowed to use unmarketed drugs or other clinical trial drugs during the study
Being tested
RK-4 injection, conventional treatment
Medical subject headings
Ischemic Stroke

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • RK-4 injectionDrug

    take drug RK-4 (2mg/mL, 1mL) by transcranial bone marrow injection once daily for consecutive 3 days.

  • conventional treatmentOther

    conventional treatment of LHI other than RK-4

Study groups in NCT07203521
Study groupRoleWhat they receive
cranial administration groupExperimentalTake drug RK-4 (2mg/mL, 1mL) by transcranial bone marrow injection once daily for consecutive 3 days.
Receives: Drug: RK-4 injection
conventional treatment groupOthertake conventional treatment of LHI
Receives: Other: conventional treatment

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. The proportion of patients achieving mRS scores of 0-3 on day 90±7 of treatment.

    The modified Rankin scale is used to measure the outcomes of patients' functional recovery after the stroke. It constitute of 0-6 scale, the higher the score is, the worse the motor function of the patient.

    Measured: day 90

Secondary outcomes (17)

  1. Evaluate the efficacy of RK-4 in patients with LHI by the change of NIHSS score on day 8±1 from baseline

    NIHSS is a scale used to assess neurological function

    Measured: day 8

  2. Evaluate the efficacy of RK-4 in patients with LHI by the change of NIHSS score on day 14±1 from baseline

    NIHSS is a scale used to assess neurological function

    Measured: day 14

  3. Evaluate the efficacy of RK-4 in patients with LHI by the proportion of NIHSS score improvement of ≥4 points on day 14±1 from baseline

    NIHSS is a scale used to assess neurological function

    Measured: day 14

  4. Evaluate the efficacy of RK-4 in patients with LHI by the comparison of mRS score distribution on day 90±7

    The modified Rankin scale is used to measure the outcomes of patients' functional recovery after the stroke. It constitute of 0-6 scale, the higher the score is, the worse the motor function of the patient.

    Measured: day 90

  5. Evaluate the efficacy of RK-4 in patients with LHI by the proportion of patients undergoing Decompressive Craniectomy（DC）within 90±7 days of treatment.

    Decompressive craniectomy (DC) is a surgical procedure used to treat severely elevated intracranial pressure due to various causes (such as trauma, bleeding, or intraoperative complications from tumors) by removing a portion of the skull to relieve intracranial pressure and improve cerebral blood flow.

    Measured: Day 1 ~ Day 90

  6. Evaluate the efficacy of RK-4 in patients with LHI by the proportion of adverse events at 90±7 days post-treatment (mRS scores 4-5, craniotomy decompression, vascular death).

    1. The modified Rankin scale is used to measure the outcomes of patients' functional recovery after the stroke. It constitute of 0-6 scale, the higher the score is, the worse the motor function of the patient.
    2. Decompressive craniectomy (DC) is a surgical procedure used to treat severely elevated intracranial pressure due to various causes (such
    3. Vascular death includes deaths due to stroke, cardiac arrest, deaths from acute myocardial infarction, deaths from heart failure, pulmonary embolism, deaths due to cardiovascular interventions or surgeries (not related to acute myocardial infarction), and other cardiovascular-related deaths (eg. arrhythmias not related to cardiac arrest, aortic rupture, or peripheral artery disease). Any death of unknown/unclear cause occurring within 30 days after a stroke, myocardial infarction, or cardiovascular intervention/surgery will be considered as death caused by stroke, myocardial infarction, or cardiovascular intervention/surgery, respectively.

    Measured: Day 1 ~ Day 90

  7. Evaluate the safety of RK-4 in patients with LHI by incidence of subject getting abnormal results of physical examinations after treatment.

    Record changes from baseline to post-treatment, listing deviations from normal ranges post-treatment. Physical examinations will be conduct by the investigator through observation

    Measured: Day1 ~ Day 90

  8. Evaluate the safety of RK-4 in patients with LHI by incidence of subject getting abnormal results of vital signs after treatment.

    Record changes from baseline to post-treatment, listing deviations from normal ranges post-treatment. Vital signs(blood pressure, respiration, pulse, body temperature will be assessed by according equipments.(electronic sphygmomanometer thermometer).

    Measured: Day 1 ~Day 90

  9. Evaluate the safety of RK-4 in patients with LHI by incidence of subject getting abnormal results of 12-lead ECG after treatment.

    Record changes from baseline to post-treatment, listing deviations from normal ranges post-treatment. 12-lead ECG will be analyzed by single RR Heart Rate, aggregate PR Interval, aggregate QRS Duration, aggregate RR Interval, aggregate QT Interval, aggregate QTC Interval. Normal range is provided by the site.

    Measured: Day 1 ~Day 90

  10. Evaluate the safety of RK-4 in patients with LHI by incidence of subject getting abnormal results of laboratory tests after treatment.

    Record changes from baseline to post-treatment, listing deviations from normal ranges post-treatment. Laboratory tests are composed of hematology, urinalysis, serum chemistry, coagulation test. Normal range is provided by the site.

    Measured: Day 1 ~Day 90

  11. Evaluate the safety of RK-4 in patients with LHI by rates of adverse events after treatment.

    An AE is defined as any untoward medical event that occurs after receiving a drug or treatment or any deterioration of a disease or symptom that existed before receiving the investigational product or treatment (excluding the disease studied in this trial) in a subject or a clinical investigation subject, whether or not considered related to the investigational product or treatment. Therefore, an AE can be a discomfort sign (including an abnormal laboratory finding), symptom, or transient disease beyond any indication, whether or not related to the investigational product or treatment.

    The investigator will name each AE reported during the study by MedDRA PT and evaluate their severity using the criteria of CTCAE 5.0.

    The relevance evaluation is divided into 5 grades: 1-certainly related; 2-probably/likely related; 3-possibly related; 4-unlikely related; 5 not related.

    Measured: Day 1 ~Day 90

  12. Evaluate the safety of RK-4 in patients with LHI by rates of Treatment Emergent Adverse Events (TEAE) after treatment.

    Treatment Emergent Adverse Events (TEAE) refer to any unfavorable medical events that occur after the administration

    Measured: Day 1 ~Day 90

  13. Evaluate the safety of RK-4 in patients with LHI by rates of Significant Adverse Events after treatment.

    Significant Adverse Events refers to any adverse event, other than a serious adverse event, that leads to the implementation of targeted medical measures (such as drug withdrawal, dose reduction, and symptomatic treatment) and is significant in blood or other laboratory tests.

    Measured: Day 1 ~Day 90

  14. Evaluate the safety of RK-4 in patients with LHI by rates of Serious Adverse Events (SAE) after treatment.

    Serious Adverse Events (SAE) refers to adverse medical events that occur after a subject receives the investigational products, including death, life-threatening conditions, permanent or severe disability or functional loss, the subject requiring hospitalization or an extension of hospital stay, as well as congenital anomalies or birth defects.

    Measured: Day 1 ~ Day 90

  15. Evaluate the safety of RK-4 in patients with LHI by rates of Suspected Unexpected Serious Adverse Event (SUSAR) after treatment.

    Suspected Unexpected Serious Adverse Event (SUSAR) refers to serious adverse reactions that are suspected and unexpected, which exceed the nature and severity of clinical manifestations described in the trial drug investigator's brochure, the instructions for marketed drugs, or the product characteristics summary.

    Measured: Day 1 ~ Day 90

  16. Evaluate the safety of RK-4 in patients with LHI by drug withdrawal due to Adverse Events.

    An AE is defined as any untoward medical event that occurs after receiving a drug or treatment or any deterioration of a disease or symptom that existed before receiving the investigational product or treatment (excluding the disease studied in this trial) in a subject or a clinical investigation subject, whether or not considered related to the investigational product or treatment.

    Measured: Day 1 ~ Day 90

  17. Evaluate the safety of RK-4 in patients with LHI by drug withdrawal due to other reasons other than Adverse Events.

    Drug withdrawal due to other reasons other than Adverse Events may be patients refuse to or investigators decision considering the patients' situation.

    Measured: Day 1 ~ Day 90

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted2 Oct 2025
  2. Study start1 Nov 2025 (estimated)
  3. Primary completion30 Apr 2026 (estimated)
  4. Study completion7 Oct 2026 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Model description
The clinical trials contains two groups: One group take drug RK-4 (2mg/mL, 1mL) by transcranial bone marrow injection once daily for consecutive 3 days. The other group just receive conventional treatments.
Masking
Single blind
Who is masked
Outcomes assessor
Enrolment
194 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07203521
Sponsor's protocol ID
RK-4-LC-02
Status last verified
Sep 2025
First submitted
23 Sep 2025
Last updated
2 Oct 2025
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing RK-4 injection and conventional treatment in people with Acute Large Hemispheric Infarction Stroke and Transcranial Bone Marrow Injection, run by Fuzhou Neurodawn Rongkang Pharmaceutical Co., Ltd.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 6 inclusion and 25 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: opening soon, as of the sponsor's last update on 2 Oct 2025. Status can change between updates, so confirm with the study contact before making plans.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact yilong wang (13911666571, yilong528@aliyun.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

The proportion of patients achieving mRS scores of 0-3 on day 90±7 of treatment. (time frame: day 90). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT07203521.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 2 Oct 2025.

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