Safety and Efficacy of NK520 to Treat Relapsed/Refractory Acute Myeloid Leukemia

Early Phase 1

Recruiting

• Conditions: Relapsed/Refractory Acute Myeloid Leukemia
• Interventions: Drug: NK520

• Registration Number: NCT06541444
• Lead Sponsor: Base Therapeutics (Shanghai) Co., Ltd.

Brief Summary

This study will evaluate the safety and efficacy of NK520 in the treatment of relapsed/refractory acute myeloid leukemia. NK520 will be administered by intravenous injection. The safety and efficacy of this treatment will be evaluated.

Detailed Description

This open label, single-arm study aims to evaluate the efficacy and safety of allogenic NK cells in subjects with relapsed/refractory acute myeloid leukemia. Allogenic NK cells will be infused once a week. After infusion, the investigators will observe the characteristics of dose limited toxicity (DLT), and determine the maximum tolerable dose(MTD). To provide basis for the dosage and treatment plan of cell products in follow-up clinical trials.

Study Timeline

• Study First Submitted: 2024-06-07
• Study Start: 2024-07-01
• Status Verified: 2024-08
• Study First Submitted QC: 2024-08-05
• Last Update Submitted: 2024-08-05
• Study First Posted: 2024-08-07
• Last Update Posted: 2024-08-07
• Primary Completion: 2026-06-01
• Study Completion: 2026-06-01

Recruitment & Eligibility

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

Inclusion Criteria

1. Participants must be between 18 and 75 years;

2. Diagnostic Criteria:

   Meet the 2016 World Health Organization (WHO) diagnostic criteria for AML, unsuitable for current treatments or patients with relapsed/refractory AML after ≥2 lines of therapy. The definition of relapsed/refractory acute myeloid leukemia is based on the 2017 Chinese Guidelines for Diagnosis and Treatment:

   1. Relapsed AML: Diagnosis is confirmed when leukemia cells reappear in the peripheral blood or bone marrow blast cells exceed 5% after complete remission (CR) (excluding reasons such as bone marrow regeneration post-consolidation chemotherapy) or there is extramedullary infiltration by leukemia cells;
   2. Refractory AML: Initial cases unresponsive after two cycles of standard regimen treatment; recurrence within 12 months after CR and consolidation therapy; recurrence beyond 12 months with ineffectiveness of conventional chemotherapy; those who have relapsed twice or more; or persistent extramedullary leukemia;

3. Eastern Cooperative Oncology Group (ECOG) performance status score of 0 to 2;

4. Expected survival of at least 12 weeks;

5. Normal Organ Function.

Exclusion Criteria

1. Acute promyelocytic leukemia;

2. Severe bleeding tendency or coagulation disorders, or currently receiving thrombolytic therapy;

3. Active tuberculosis (TB), currently undergoing anti-TB treatment, or treated for TB within 1 year prior to the study;

4. HIV-infected individuals, or known active syphilis infection;

5. Use of immunosuppressive drugs within 1 week before the first dose, excluding topical, inhaled, or other locally administered glucocorticoids, or physiologic doses of systemic glucocorticoids (not exceeding 10 mg/day prednisone equivalent) for allergic reactions or for managing respiratory distress from asthma, COPD, etc;

6. Receipt of live attenuated vaccines within 2 weeks before the first dose or planned during the study;

7. Participation in another clinical trial and receipt of investigational drug within 4 weeks prior to the first dose;

8. Receipt of immune-modulating drugs (including thymosin, interferons, except for local use to control pleural or ascitic fluid) within 2 weeks prior to the first dose;

9. At screening, hepatitis B or C viral tests positive according to either:

   • HBsAg positive with serum HBV-DNA titer ≥1×10^3 copies/mL or above normal limits;
   • HCV antibody positive;

10. Any other condition or situation in which the investigator deems the patient unsuitable for participation in this study.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SEQUENTIAL

Arm && Interventions

Group	Intervention	Description
Group C(high-dose group)	NK520	NK520: 9×10\^7NK/kg
Group A(low-dose group)	NK520	NK520: 3×10\^7NK/kg
Group B(medium-dose group)	NK520	NK520: 6×10\^7NK/kg

Primary Outcome Measures

Name	Time	Method
Dose-Limiting Toxicity	From the first dose of NK520 to 4 weeks after last infusion of NK520	To evaluate the DLT during NK520 treatment
Complete Response Rate (CRR)	From the date of first infusion of NK520 up to 104 weeks.	Effectiveness Metrics

Secondary Outcome Measures

Name	Time	Method
Overall response rate (ORR)	From the date of first infusion of NK520 up to 104 weeks.	Effectiveness Metrics
Event-Free Survival (EFS)	From date of enrollment up to 104 weeks, or date of progression, or date of death, whichever came first.	Effectiveness Metrics
Overall Survival (OS)	From date of enrollment up to 104 weeks or date of death, whichever came first.	Effectiveness Metrics
Duration of Response (DOR)	From the date of enrollment up to 104 weeks	Effectiveness Metrics

Trial Locations

Locations (1)

Shanghai Pudong Hospital; 🇨🇳 Shanghai, Shanghai, China