A Study of CAR-GPRC5D in Patients With Relapsed/Refractory Multiple Myeloma or Plasma Cell Leukemia

NCT ID: NCT05219721

Last Updated: 2025-06-11

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: PHASE1
• Total Enrollment: 18 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2022-03-17
• Study Completion Date: 2025-10-01

Brief Summary

This study is a single-center, open-label, dose-exploration study to observe the safety and efficacy of different doses of CAR-GPRC5D in patients with R/R MM or plasma cell leukemia.

Detailed Description

Apheresis will be performed to manufacture CAR-GPRC5D chimeric antigen receptor (CAR) modified T cells. Bridging therapy is allowed between apheresis and lymphodepletion. Lymphodepletion with fludarabine and cyclophosphamide was performed for three consecutive days. Then, subjects will receive a single dose infusion of CAR-GPRC5D at 1.0, 2.0, or 3.0 x 10^6 CAR+ T cells/Kg. Subjects will be followed in the study for a minimum of 2 years after infusion. Long-term follow-up for lentiviral vector safety will be followed for up to 15 years after infusion.

Conditions

Relapsed/Refractory Multiple Myeloma; Plasma Cell Leukemia

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

CAR-GPRC5D cells

After lymphodepletion, CAR-GPRC5D will be administered as a single infusion.

Group Type: EXPERIMENTAL

CAR-T (CAR-GPRC5D)

Intervention Type: DRUG

CAR-GPRC5D (RD118) is an individualized, gene-modified autologous T-cell immunotherapy product targeting GPRC5D that identifies and eliminates malignant and normal cells expressing GPRC5D. The CAR structure comprises a fully human single-domain antibody fragment (VHH) targeting GPRC5D, fused with intracellular co-stimulatory (4-1BB) and activation (CD3ζ) signaling domains.

Interventions

CAR-T (CAR-GPRC5D)

CAR-GPRC5D (RD118) is an individualized, gene-modified autologous T-cell immunotherapy product targeting GPRC5D that identifies and eliminates malignant and normal cells expressing GPRC5D. The CAR structure comprises a fully human single-domain antibody fragment (VHH) targeting GPRC5D, fused with intracellular co-stimulatory (4-1BB) and activation (CD3ζ) signaling domains.

Intervention Type: DRUG

Eligibility Criteria

Inclusion Criteria

• Subjects must satisfy all the following criteria to be enrolled in the study:

1. age 18 to 75 years old, male or female.

2. Subjects have had at least 3 prior lines of therapy including chemotherapy based on proteasome inhibitors (PIs) and immunomodulatory agents (IMiDs).

According to the International Myeloma Working Group (IMWG) consensus (2016) standard on multiple myeloma, the disease has recurred, progressed or is refractory, or according to the IMWG consensus (2013) standard on plasma cell leukemia (Appendix 4), the disease appears relapse, progress or refractory;

3. Evidence of cell membrane GPRC5D expression, as determined by a validated immunohistochemistry (IHC) or flow cytometry of tumor tissue (e.g., bone marrow biopsies, or plasmacytoma).

4. The subjects should have measurable disease based on at least one of the following parameters:

The proportion of primitive immature or monoclonal plasma cells detected by bone marrow cytology, bone marrow biopsy, or flow cytometry is ≥ 10%.

Serum M-protein ≥ 0.5 g/dL. Urine M-protein ≥ 200 mg/24 hrs. For those whose Serum or Urine M-protein does not meet the measurable criteria but the light chain type, serum free light chain (sFLC) : involved sFLC level ≥ 10mg/dL (100 mg/L) provided serum FLC ratio is abnormal.

In subjects with extramedullary myeloma, if there are no other evaluable lesions, require extramedullary lesions with a maximum diameter of ≥2cm

5. ECOG performance score 0-2.

6. Estimated life expectancy ≥ 12 weeks.

7. Subjects should have adequate organ function:

• Hematology: Absolute neutrophil count (ANC) ≥1×10^9 /L (prior use of growth factor support is permitted, but subjects must not have received supportive treatment within 7 days prior to laboratory examination); absolute lymphocyte count (ALC) ≥0.3×10^9 /L; platelets ≥40×10^9 /L (subjects must not have received blood transfusion support within 7 days prior to laboratory examination); hemoglobin ≥60 g/L (subjects must not have received transfusion of red blood cells [RBC] within 7 days prior to laboratory examination; the use of recombinant human erythropoietin is permitted).
• Liver function: Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤ 2.5×upper limit of normal (ULN); total serum bilirubin ≤ 1.5×ULN.
• Renal function: Creatinine clearance rate (CrCl) calculated according to Cockcroft-Gault formula ≥ 40 ml/min.
• Coagulation function: Fibrinogen ≥ 1.0 g/L; activated partial thromboplastin time (APTT) ≤ 1.5×ULN, prothrombin time (PT) ≤1.5×ULN.
• SpO2 > 91%.
• Left ventricular ejection fraction (LVEF) ≥ 50%.

8. The subject and his/her spouse agree to use an effective contraceptive tool or medication (excluding safety period contraception) for one year from the date of the subject's informed consent to the date of CAR T cell infusion.

9. Subject must sign the informed consent form approved by ethics board in person before starting any screening procedure.

Exclusion Criteria

• The presence of any of the following will exclude a subject from enrollment:

1. Subjects who are known to have GVHD or need long-term immunosuppressive therapy.

2. Subjects have received any anti-cancer treatment as follows:

monoclonal antibody for treating multiple myeloma within 21 days before leukapheresis, or cytotoxic therapy or proteasome inhibitors within 14 days before leukapheresis, or immunomodulatory agents within 7 days before leukapheresis. or anti-tumor treatments other than those listed above within 30 days before leukapheresis.

3. Subjects who were receiving a used therapeutic dose of corticosteroid treatment (defined as prednisone or equivalent > 20mg) within 7 days prior to screening, except for physiological alternatives, inhalation, or topical use.

4. Subjects with hypertension that cannot be controlled by medication.

5. Subjects with serious heart disease: including but not limited to unstable angina, myocardial infarction (within 6 months prior to screening), congestive heart failure (NYHA classification ≥III), and severe arrhythmias.

6. Subjects with systemic diseases that the investigator determined to be unstable include, but are not limited to, severe liver and kidney or metabolic diseases requiring medical treatment.

7. Subjects with second malignancies in addition to MM within the past 5 years before the screening, exceptions to this criterion: successfully treated cervical carcinoma in situ and non-metastatic basal or squamous cell skin carcinoma, local prostate cancer after radical surgery, and ductal carcinoma in situ of the breast after radical surgery.

8. Subjects with a history of organ transplantation.

9. Subjects have received major surgery within 2 weeks prior to leukapheresis or plan to receive surgery during the study or within 2 weeks after the study treatment (excluding local anesthesia).

10. Subjects participated in another interventional clinical study 1 months before signing the informed consent (ICF);

11. Subjects with any uncontrolled active infection needed to receive systemic therapy within 7 days before leukapheresis collection (excluding # CTCAE grade 2 urogenital infection and upper respiratory infection).

12. Positive for any of the following tests:

• Hepatitis B virus (HBV) surface antigen (HBsAg) or hepatitis B core antibody-positive and detectable HBV DNA in peripheral blood
• Hepatitis C virus (HCV) antibody and hepatitis C virus RNA in peripheral blood
• Human immunodeficiency virus (HIV) antibody
• Cytomegalovirus (CMV) DNA
• Treponema Pallidum antibody

13. Pregnant or lactating women.

14. Subjects with mental illness or consciousness disorder or disease of the central nervous system

15. Other conditions that researchers consider inappropriate for inclusion.

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 75 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Nanjing IASO Biotechnology Co., Ltd.

INDUSTRY

Sponsor Role: collaborator

Chunrui Li

OTHER

Sponsor Role: lead

Responsible Party

Chunrui Li

Professor

Responsibility Role: SPONSOR_INVESTIGATOR

Principal Investigators

Chunrui Li

Role: PRINCIPAL_INVESTIGATOR

Tongji Hospital

Locations

Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology

Wuhan, Hubei, China

Site Status: RECRUITING

Countries

China

Central Contacts

Chunrui Li

Role: CONTACT

cunrui5650@126.com

86-13647233185

Facility Contacts

Chunrui Li

Role: primary

cunrui5650@126.com

+86 13647233185

References

Pan M, Wang D, Xu J, Jin S, Wang Y, Tao Y, Liu Y, Ouyang W, Weng X, Yi H, Huang Y, Cao X, Li S, Zhang F, Zhang W, Li C, Mi JQ. Fully Human anti-GPRC5D CAR T-Cell Therapy RD118 Induces Durable Remissions in Relapsed/Refractory Multiple Myeloma. Blood. 2025 Oct 21:blood.2025030559. doi: 10.1182/blood.2025030559. Online ahead of print.

Reference Type: DERIVED

PMID: 41118600 (View on PubMed)

Other Identifiers

RD138CI001

Identifier Type: -

Identifier Source: org_study_id