(TNX-1500) in Kidney Transplant Recipients

Not Applicable

Not yet recruiting

• Conditions: Kidney Transplant; Kidney Transplant Failure and Rejection; Immunosuppression; Immunosuppression After Kidney Transplantation
• Interventions: Drug: TNX-1500; Procedure: Kidney Transplant

• Registration Number: NCT07204080
• Lead Sponsor: Ayman Al Jurdi, MD

Brief Summary

The primary objective is to investigate the safety and efficacy of TNX-1500, an FC-modified anti-CD154 mAb, in five kidney transplant recipients at 12 months.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2025-09-25
• Status Verified: 2025-10
• Study First Submitted QC: 2025-10-01
• Last Update Submitted: 2025-10-01
• Study First Posted: 2025-10-02
• Last Update Posted: 2025-10-02
• Study Start: 2026-01-01
• Primary Completion: 2028-03-01
• Study Completion: 2028-12-31

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 5

Inclusion Criteria

1. Male or female subjects ≥18 to 75 years of age.
2. Kidney transplant candidates with chronic kidney disease (stage IV or V) or end-stage kidney disease evaluated and listed for transplantation at Massachusetts General Hospital.
3. Recipient of an ABO-compatible, non-human leukocyte antigen (HLA) identical living or deceased donor kidney (de novo or second transplant)
4. Ability to understand the study requirements and provide written informed consent.
5. Epstein-Barr virus (EBV) seropositive

Exclusion Criteria

1. Recipient seropositive for human immunodeficiency virus (HIV-1), or hepatitis B surface antigen (HBsAg) or core antibody (Anti-HBc); subjects who are seropositive for hepatitis C virus (HCV) are excluded without proof of sustained viral response (SVR) after anti-HCV treatment or spontaneous clearance.

2. Recipient of a kidney from a donor who tests positive for HIV, HBsAg, Anti-HBc, or HCV NAT.

3. Subjects with a severe systemic infection, current or within the 2 weeks prior to screening.

4. Left ventricular ejection fraction < 40% as determined by TTE or clinical evidence of heart failure.

5. Pregnant or nursing (lactating) women confirmed by human chorionic gonadotropin (hCG) laboratory test.

6. Women of childbearing potential (women capable of becoming pregnant) unless using a highly effective method of contraception during dosing and for 24 weeks after study treatment. Highly effective contraception methods include:

   1. Female sterilization (surgical, bilateral oophorectomy with or without hysterectomy), or tubal ligation at least 6 weeks before taking study treatment.
   2. Male sterilization (at least 6 months prior to screening); for female subjects on the study, the vasectomized male partners should be the sole partners for that subject.
   3. Use of injected or implanted hormonal methods of contraception or other hormonal contraception that have comparable efficacy (<1% for example, hormone vaginal ring or placement of a long-acting reversible contraceptives, an intrauterine device, or intrauterine system.
   4. Total abstinence

7. Use of other investigational products or enrollment in another investigational drug study within 30 days prior to screening or 5 half-lives, whichever is longer.

8. Subjects with clinically significant lab abnormalities (>2.5 x the upper limit of normal (ULN) of the following liver function chemistries unless due to, as judged by the investigator, a benign underlying condition:

   1. Alanine aminotransferase (ALT)
   2. Aspartate aminotransferase (AST)
   3. Alkaline phosphatase (ALP)
   4. Bilirubin
   5. Coagulation studies (international normalization ratio (INR), prothrombin time (PT), and partial thromboplastin time (PTT))

9. Any other clinically significant medical condition, active infection, laboratory abnormality, or psychosocial condition (e.g. history of substance use disorder) that would, in the judgement of the investigator, impact the subject's ability to participate in the trial.

10. Subject receives an organ at high risk for delayed graft function, including from a deceased donor after cardiac death (DCD) or a high Kidney Donor Profile Index ≥85%.

11. Presence of pre-existing donor-specific antibodies (DSA) or calculated panel reactive antibodies (cPRA) >20% based upon results within 6 months prior to transplant.

12. Virtual crossmatch (VXM) positive transplant with an MFI >1000 as assessed by routine methodology (Luminex)

13. Cytomegalovirus (CMV) high risk combination: donor positive to recipient negative

14. Multi-organ transplant or tissue recipient.

15. History of malignancy of any organ system, except for localized excised non-melanomatous skin or carcinoma in situ of the cervix

16. Subjects with any of the following: hemoglobin <8 mg/dL, white blood cell ≤2,000/mm3, or platelet count ≤75,000/mm3.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Kidney Transplant Recipient	TNX-1500	-
Kidney Transplant Recipient	Kidney Transplant	-

Primary Outcome Measures

Name	Time	Method
Number of Adverse Events in each subject	12 Months	The primary endpoint is the cumulative incidence of all AEs and SAEs in subjects treated with TNX-1500 at 12-months (Day 364, Week 52).
Number of Serious Adverse Events in each subject	12 Months	The primary endpoint is the cumulative incidence of all AEs and SAEs in subjects treated with TNX-1500 at 12-months (Day 364, Week 52).

Secondary Outcome Measures

Name	Time	Method
Incidence of Biopsy Proven Acute Rejection	12 months	Acute rejection, treatment and outcome biopsy pathology grading (Banff Criteria)
Incidence of treatment for acute rejection	12 Months	Acute rejection, treatment and outcome biopsy pathology grading (Banff Criteria)
Incidence of de novo DSA development	Months 1, 3, 6, 9, 12
Incidence of serious opportunistic infections and malignancies	12 months	based upon AE/SAE data and available quantitative and qualitative EBV and CMV surveillance data
GFR measurement	12 months	Assessment of renal function through the estimated glomerular filtration rate and the slope of eGFR at 12 months post-transplant
Incidence of death	12 months
Incidence of graft loss	12 months
Degree of Proteinuria and albuminuria	12 Months	Proteinuria and albuminuria by urine protein-to-creatinine ratio and urine microalbumin-to-creatinine ratio

Trial Locations

Locations (1)

Massachusetts General Hospital; 🇺🇸 Boston, Massachusetts, United States