NCT06072989

Repeat Intravenous Infusions of B4T2-001 CAR-T Without Lymphodepleting Chemotherapy for Solid Tumors

A Single Arm, Open Label Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Antitumor Activity of B4T2-001 CAR-T in Patients With Advanced Solid Tumors

• Status: Recruiting
• Phase: Phase 1
• Study type: Interventional
• Enrollment: 24 (estimated)
• Sponsor: Shanghai East Hospital · Academic / Other
• Sex: All
• Age: 18 Years – 70 Years
• Healthy volunteers: Not accepted

Summary

This is an open-label, dose escalation and expansion study to evaluate the safety, tolerability, pharmacokinetics, and antitumor activity of autologous B4T2-001 CAR-T in subjects with advanced solid tumors including but not limited to advanced gastric or gastroesophageal junction (GEJ) adenocarcinoma, advanced pancreatic cancer, advanced non-small cell lung cancer (NSCLC), colorectal cancers (CRC) and metastatic breast cancer that tests positive for BT-001 target antigen according to Immunohistochemistry (IHC). The trial builds off first-in-human results from pilot study per clinicaltrials.gov ID: NCT05621486 to administer multiple infusions of B4T2-001 CAR-T without the need to give preparative chemotherapy (lymphodepletion).

Detailed description

This is an open-label dose escalation and expansion study to evaluate the safety, tolerability, pharmacokinetics (PK), and antitumor activity of lentiviral transduced autologous B4T2-001 CAR-T at up to four Dose Levels. Each treatment Block is composed of three Cycles of B4T2-001 CAR-T administered every 21 days by intravenous route without preparative chemotherapy (lymphodepletion). Subjects with advanced solid tumors will be enrolled. One or more Cycle(s) will be delayed as part of routine dosing plan until (i) absolute neutrophil count (ANC) greater than lower limit of normal (LLN) and (ii) resolution of grade \>2 toxicity probably or definitely attributed to prior CAR-T and (iii) CAR-T available. Cycles will discontinue if (i) confirmatory imaging shows progressive disease (PD) and/or (ii) CAR-T cells are unavailable. Each additional Block(s) to begin at least 21 days after third Cycle of prior Block. The next patient(s) may be enrolled at least 21 days after completion of first Cycle of prior patient. The decision for dose escalation decision depends on the safety of first Cycle. Two subjects will be enrolled into each Dose Level. If none experiences a dose-limiting toxicity (DLT), the next cohort of two subjects will be enrolled into the next higher dose level. If a DLT is observed in one subject, four additional subjects will be added into the same dose level. If no additional DLT occur, DL will be escalated to the next higher dose level. If DLT occurs in two or more subjects among two to six subjects at a given dose level, dose escalation will be stopped, and the prior dose level will be expanded to six subjects to confirm maximum tolerated dose (MTD). If there is no more than one subject who experiences a DLT among those six subjects, that dose level is considered the MTD. Response to the treatment will be assessed before and after each Block. CT or MRI or PET for response assessment is anticipated every 60 days till day 180, then every 90 days till the end of the study. If complete response (CR), PD, or partial response (PR) on Day 60's assessment, another imaging study will be performed to confirm findings about 4 weeks later. The tumor marker(s) should be performed at the beginning and end of each Cycle All subjects will receive B4T2-001 CAR-T infusion at a healthcare facility, followed by frequently monitoring at a healthcare facility for at least 7 days to monitor for signs and symptoms of cytokine release syndrome (CRS) including immune effector cell-associated neurotoxicity syndrome (ICANS) and/or hemophagocytic lymphohistiocytosis (HLH) and macrophage activation syndrome (MAS). One dose of tocilizumab will be administrated on Day 7 of each Cycle as prophylaxis for CRS. The study follows sequential steps: patient screening, apheresis, bridging therapy (as needed), CAR-T infusions and follow up for up to two years. If the safety and tolerability are acceptable and recommended phase 2 dose (RP2D) is determined from the dose escalation stage, dose expansion will be considered.

Conditions

• Advanced Solid Tumor

Interventions

Type	Name	Description
BIOLOGICAL	B4T2-001 autologous CAR-T	Each subject will receive multiple intravenous infusions of B4T2-001 autologous CAR-T without preparative chemotherapy (lymphodepletion)

Timeline

• Start date: 2023-10-01
• Primary completion: 2025-03-01
• Completion: 2027-03-01
• First posted: 2023-10-10
• Last updated: 2023-10-10

Locations

2 sites across 1 country: China