Efficacy and Safety Study of Jaktinib in Subjects With Active Ankylosing Spondylitis(AS)

December 30, 2025 updated by: Suzhou Zelgen Biopharmaceuticals Co.,Ltd

A Phase 3, Multicenter, Randomized, Double-Blind, Placebo-Controlled Study Evaluating the Efficacy and Safety of Jaktinib in Subjects With Active Ankylosing Spondylitis(AS)

This is a Phase 3, multicenter, randomized, double-blind, placebo-controlled, efficacy and safety study of Jaktinib in subjects with active Ankylosing Spondylitis(AS).

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Active, not recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Approximately 258 eligible subjects (129 per arm) will be randomized in a 1:1 ratio to Jaktinib 100mg BID (twice daily) or matching placebo BID for a total of 16 weeks of blinded treatment. During the 16-week treatment period subjects will visit the clinic every two weeks until the Week 4 visit and then every 4 weeks until the completion of Week 16.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
265

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • China
    • Shanghai Municipality
      • Shanghai, Shanghai Municipality, China, 200001
        • Renji Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Participants must be able to understand the study and signed the informed consent.
  • 18-65 years, male or female.
  • Participants with a clinical diagnosis of ankylosing spondylitis (AS), and radiologic evidence (x-ray) fulfilling the Modified New York criteria for AS(1984).
  • Participants must have baseline disease activity as defined by having a Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) score ≥ 4 and a Patient's Assessment of Total Back Pain score ≥ 4 based on a 0 - 10 Numeric Rating Scale (NRS) at the Screening and Baseline Visits.
  • Participants may be receiving the following Disease-Modifying Anti-Rheumatic Drugs(DMARDs) at the time of the screening visit. These medications should be continued throughout the entire study and doses should remain unchanged.
  • Participants has had an inadequate response to at least two Nonsteroidal Anti-inflammatory Drugs (NSAIDs) over an at least 4-week period in total at maximum recommended or tolerated doses, or participant has an intolerance to or contraindication for NSAIDs.
  • Participants who are regularly taking NSAIDs (including COX-1 or COX-2 inhibitors) as part of their AS therapy are required to be on a stable dose for at least 2 weeks before randomisation.
  • Participants receiving non-prohibited concomitant medications for any reason must be willing to stay on a stable regimen as defined in the protocol.

Exclusion Criteria:

  • History of known or suspected complete ankylosis of the spine.
  • Any subject with condition affecting oral drug absorption.
  • Participants taking high potency opioid analgesics (e.g. methadone, hydromorphone, morphine) within 4 weeks before randomization.
  • Participants on any other DMARDs within 4 weeks or five half-lives (whichever is longer) of the drug prior to the Baseline visit.
  • Participants has a history of inflammatory arthritis of different etiology other than axial SpA (including but not limited to rheumatoid arthritis, mixed connective tissue disease, systemic lupus erythematosus, reactive arthritis, scleroderma, polymyositis, dermatomyositis, fibromyalgia), or any arthritis with onset prior to 17 years of age.
  • Significant trauma or surgery procedure within 8 weeks prior to randomization, or any planned elective surgery during the study period.
  • Participants with a known immunodeficiency disorder or a first degree relative with a hereditary immunodeficiency.
  • Participants with any condition possibly affecting oral drug absorption, eg, gastrectomy, clinically significant diabetic gastroenteropathy, or certain types of bariatric surgery.
  • Use of any investigational drug and/or devices within 4 weeks of randomization or a period of 5 half-lives of the investigational drug, whichever is longer.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Placebo Comparator: Placebo
Drug: Placebo
Participants will receive matching placebo orally twice daily for 16 weeks
Experimental: Jaktinib 100mg BID (twice daily)
Drug: Jaktinib
Participants will receive 100 mg Jaktinib orally twice daily for 16 weeks

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Percentage of Participants with Assessment in Ankylosing Spondylitis (ASAS) 40 response at Week 16
Time Frame: Week 16
ASAS40 is defined as a >= 40% improvement and an absolute improvement of ≥ 2 units (on a scale of 0 to 10) from Baseline in at least 3 of the 4 domains (patient's global assessment, back pain, function and inflammation) with no worsening at all in the remaining domain.
Week 16

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Percentage of Participants with Assessment in Ankylosing Spondylitis (ASAS) 20 response at Week 16.
Time Frame: Week 16
ASAS20 is defined as a >= 20% improvement and an absolute improvement of >= 1 units (on a scale of 0 to 10) from Baseline in at least 3 of the 4 domains (patient's global assessment, back pain, function and inflammation) with no deterioration in the remaining domain (where deterioration is defined as a worsening of >= 20% and a net worsening of >= 1 unit [on a scale of 0 to 10])
Week 16
Percentage of Participants with Assessment in Ankylosing Spondylitis (ASAS) 40 response at Week 2、4、8 and 12.
Time Frame: Week 2、4、8 and 12
ASAS40 is defined as a >= 40% improvement and an absolute improvement of ≥ 2 units (on a scale of 0 to 10) from Baseline in at least 3 of the 4 domains (patient's global assessment, back pain, function and inflammation) with no worsening at all in the remaining domain.
Week 2、4、8 and 12
Percentage of Participants with Assessment in Ankylosing Spondylitis (ASAS) 20 response at Week 2、4、8 and 12.
Time Frame: Week 2、4、8 and 12
ASAS20 is defined as a >= 20% improvement and an absolute improvement of >= 1 units (on a scale of 0 to 10) from Baseline in at least 3 of the 4 domains (patient's global assessment, back pain, function and inflammation) with no deterioration in the remaining domain (where deterioration is defined as a worsening of >= 20% and a net worsening of >= 1 unit [on a scale of 0 to 10])
Week 2、4、8 and 12

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Suzhou Zelgen Biopharmaceuticals Co.,Ltd

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Chunde Bao, Renji Hospital

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
July 20, 2023

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
May 1, 2026

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
July 1, 2026

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
May 6, 2023

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 6, 2023

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 16, 2023

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
January 5, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
December 30, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
December 1, 2025

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • ZGJAK029

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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