NK521 in the Treatment of Advanced Solid Tumors

NCT07657416 | Not Yet Recruiting Early Phase 1

• 1 other identifier: NK521-02
• Study Type: interventional
• Target: 18
• Locations: 1 country
• Sites: 1

Brief Summary

Eligible subjects with advanced hepatocellular carcinoma and ovarian cancer will be divided into two treatment groups based on the volume of ascites. Group A consists of patients with mild ascites, who will receive NK521 via intravenous infusion. Group B includes patients with moderate to severe ascites, who will be treated with investigator-selected systemic regimens combined with intraperitoneal perfusion of NK521. Systemic and local medications will be administered in accordance with the treatment regimens of respective groups, and the safety of the study drug will be monitored. Preliminary anti-tumor efficacy will be assessed using the RECIST 1.1 criteria at Week 6 after the first infusion of NK521. Catheter placement and ascites drainage will be performed 3 days prior to the first intraperitoneal perfusion of NK521. After the initial intraperitoneal perfusion treatment, the therapeutic effect on ascites will be evaluated per the WHO criteria for ascites assessment.

Conditions

Hepatocellular Carcinoma (HCC); Ovarian Cancer; Malignant Ascites

Outcome Measures

Primary Outcomes (1)

• Incidence of Treatment-Emergent Adverse Events and dose-limiting toxicities [Safety and Tolerability]

  The incidence and severity of treatment-emergent adverse events, the occurrence of dose-limiting toxicities, and clinically significant laboratory abnormalities, to evaluate the safety and tolerability of the study treatment.

  Treatment-emergent adverse events are recorded from the first administration until the final follow-up visit, up to 24 months, and dose-limiting toxicities are monitored within the 28-day period after the last administration.

Secondary Outcomes (4)

• Objective Response Rate (ORR)

  From the first administration, assessed every 6 weeks until disease progression or death, whichever comes first, up to 24 months.

• Progression-Free Survival (PFS)

  From the first administration, assessed every 6 weeks until progression or death, up to 24 months.

• Overall Survival (OS)

  From the first administration, followed up every 3-6 months until death or study closure, up to 24 months.

• Malignant Ascites Control Rate

  From the first intraperitoneal administration, assessed every 3 weeks until the end of treatment, up to 24 months.

Study Arms (2)

Intravenous NK521

EXPERIMENTAL

NK521 Cell Injection Route: Intravenous infusion Dose level: 1×10⁹, 3×10⁹, 6×10⁹ cells

Biological: NK521 Cell Injection

Intraperitoneal NK521

EXPERIMENTAL

NK521 Cell Injection Route: Intraperitoneal perfusion Dose: 1×10⁹, 3×10⁹, 6×10⁹ NK cells per administration Regimen: Once weekly, 3 weeks per cycle, for 2 consecutive cycles, plus investigator-selected systemic therapy

Biological: NK521 Cell Injection

Interventions

NK521 Cell Injection BIOLOGICAL

Gene-edited natural killer (NK) cell product with knockout of TIGIT, NKG2A, and TGF-β, administered via intravenous infusion or intraperitoneal perfusion for the treatment of malignant ascites associated with advanced solid tumors.

Intravenous NK521

Eligibility Criteria

• Age: 18 Years - 65 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Patients with pathologically confirmed relapsed/refractory advanced solid tumors, including hepatocellular carcinoma and ovarian cancer. Patients enrolled in the intraperitoneal perfusion group (Group B) must have malignant ascites with tumor cells identified in the ascitic fluid.
• Patients with advanced solid tumors who have received ≥ 1 line of standard therapy.
• At least one measurable lesion on CT or MRI per RECIST v1.1.
• ECOG performance status 0-2.
• Life expectancy ≥3 months.
• Women of childbearing potential must be non-lactating with a negative serum pregnancy test within 1 week before enrollment; all subjects must agree to use contraception from signing informed consent until 6 months after the last NK521 infusion.
• Able to comply with the study protocol and follow-up procedures.
• Voluntarily signed and provided written informed consent.

You may not qualify if:

• Symptomatic central nervous system (CNS) metastasis and/or carcinomatous meningitis.
• History of immunodeficiency, including positive HIV test, other acquired or congenital immunodeficiency diseases, or organ transplantation.
• History of severe cardiovascular and cerebrovascular diseases, including but not limited to: severe cardiac arrhythmia or conduction abnormality requiring clinical intervention (e.g., ventricular arrhythmia, third-degree atrioventricular block); QTc interval \>480 ms on 12-lead ECG at rest; acute coronary syndrome, congestive heart failure, aortic dissection, stroke, or other Grade ≥3 cardiovascular/cerebrovascular events within 6 months before enrollment; NYHA Class ≥II heart failure or left ventricular ejection fraction (LVEF) \<50%; uncontrolled hypertension.
• Received radical radiotherapy within 4 weeks before enrollment; received local palliative radiotherapy within 2 weeks before enrollment.
• Received cellular antineoplastic therapy within 1 year before dosing; received other antineoplastic therapy outside this protocol within 4 weeks before dosing, including but not limited to chemotherapy, molecular targeted therapy, hormonal therapy, immunotherapy, biotherapy, or Chinese herbal patent medicine with antineoplastic indications.
• Received blood transfusion, erythropoietin, granulocyte colony-stimulating factor (G-CSF), or granulocyte-macrophage colony-stimulating factor therapy within 2 weeks before enrollment.
• Received systemic therapy with corticosteroids (prednisone \>10 mg/day or equivalent) or other immunomodulatory agents (e.g., thymosin, interleukin-2, interferon) within 2 weeks before enrollment. Inhaled or topical corticosteroids are allowed in subjects without active autoimmune disease.
• Positive virology test for hepatitis B or hepatitis C at screening, meeting any of the following:
• a. HBsAg positive with positive HBV-DNA titer or above upper limit of normal (ULN); b. HCV antibody positive.
• Meeting any of the following laboratory criteria:a. Hematology: Absolute neutrophil count \<1.5×10⁹/L; platelet count \<75×10⁹/L; hemoglobin \<90 g/L.b. Hepatic function: ALT \>3×ULN (≥5×ULN for liver metastasis); AST \>3×ULN (≥5×ULN for liver metastasis); TBIL \>1.5×ULN, or TBIL \>2.5×ULN (3.0 mg/dL) for subjects with Gilbert syndrome.c. Renal function: Serum creatinine \>1.5×ULN or creatinine clearance \<50 mL/min.
• Any other severe or uncontrolled medical disease, active infection, abnormal physical examination, abnormal laboratory test, altered mental status, or psychiatric disease that, in the investigator's opinion, increases subject risk or affects study results.

Sponsors & Collaborators

• Base Therapeutics (Shanghai) Co., Ltd.: lead

Study Sites (1)

1st affiliated hospital of Anhui Medical University

Hefei, Anhui, China

Location

MeSH Terms

Conditions

Carcinoma, Hepatocellular; Ovarian Neoplasms

Condition Hierarchy (Ancestors)

Adenocarcinoma; Carcinoma; Neoplasms, Glandular and Epithelial; Neoplasms by Histologic Type; Neoplasms; Liver Neoplasms; Digestive System Neoplasms; Neoplasms by Site; Digestive System Diseases; Liver Diseases; Endocrine Gland Neoplasms; Ovarian Diseases; Adnexal Diseases; Genital Diseases, Female; Female Urogenital Diseases; Female Urogenital Diseases and Pregnancy Complications; Urogenital Diseases; Genital Neoplasms, Female; Urogenital Neoplasms; Genital Diseases; Endocrine System Diseases; Gonadal Disorders

Central Study Contacts

Sun Beicheng

CONTACT

0551-62923004; ayfykyll@163.com

Study Design

• Study Type: interventional
• Phase: early phase 1
• Allocation: NON RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: INDUSTRY
• Responsible Party: SPONSOR

Model Details: Arm 1: Intravenous NK521 Intervention: NK521 Cell Injection Route: Intravenous infusion Dose level: 1×10⁹, 3×10⁹, 6×10⁹ cells Arm 2: Intraperitoneal NK521Intervention: NK521 Cell Injection Route: Intraperitoneal perfusion Dose level: 1×10⁹, 3×10⁹, 6×10⁹ cells

Study Record Dates

• First Submitted: June 15, 2026
• First Posted: June 18, 2026
• Study Start: June 1, 2026
• Primary Completion (Estimated): October 1, 2027
• Study Completion (Estimated): July 1, 2028
• Last Updated: June 18, 2026

Record last verified: 2026-05

Locations

CN (1)