Chimeric Receptor T Cells With Trastuzumab in HER2+ Advanced Breast Cancer and Other Solid Tumors

Phase 1

Not yet recruiting

• Conditions: HER2+ Advanced Breast Cancer; Other Solid Tumors
• Interventions: Drug: Chimeric receptor T-cells + Trastuzumab; Drug: Fludarabine and Cyclophosphosphamide

• Registration Number: NCT06027983
• Lead Sponsor: National University Hospital, Singapore

Brief Summary

This phase Ib study aims to assess the safety and feasibility of combination of chimeric receptor T cells with trastuzumab in patients with HER2+ solid tumors, with further expansion of study population in HER2+ metastatic breast cancer once safety has been established.

Detailed Description

Hypothesis

Investigators hypothesize that trastuzumab-mediated cytotoxicity will be augmented by the infusion of autologous chimeric receptor T-cells.

Primary Objectives

1. To determine the safety of autologous chimeric receptor T-cells in patients with HER2+ advanced solid tumors

2. To determine the clinical benefit rate (CBR) of autologous chimeric receptor T-cells in patients with HER2+ advanced breast cancer

Secondary Objectives

1. To determine the expansion and persistence of autologous chimeric receptor T-cells after a single infusion in patients with advanced solid tumors

2. To determine anti-tumor efficacy in terms of objective response rate (ORR) and progression-free survival (PFS) of autologous chimeric receptor T-cells in patients with HER2+ advanced breast cancer

Study Timeline

• Status Verified: 2023-06
• Study First Submitted: 2023-08-31
• Study First Submitted QC: 2023-08-31
• Study First Posted: 2023-09-07
• Last Update Submitted: 2023-10-26
• Last Update Posted: 2023-10-30
• Study Start: 2023-11-01
• Primary Completion: 2025-12-31
• Study Completion: 2027-12-31

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 36

Inclusion Criteria

Patients may be included in the study only if they meet all of the following criteria:

• Age ≥ 21 years.

• Histologically confirmed diagnosis of HER2-positive cancer defined by immunohistochemistry (IHC) to be HER2 IHC3+ or HER2 IHC2+ and FISH positive. If immunohistochemistry is not available, FISH method is acceptable. The HER2 positivities by FISH is determined as FISH amplification ratio positive by institutional guidelines. Tumor subtype for each phase include :

• Phase I: HER2-positive breast or gastric cancer or other treatment-refractory HER2-positive solid tumors

• Phase II : HER2-positive breast carcinoma

• Eastern Cooperative Oncology Group (ECOG) performance status 0-1.

• Has measurable or evaluable disease based on RECIST 1.1 criteria

• Estimated life expectancy of at least 12 weeks.

• Prior lines of therapy:

• HER2-positive breast cancer - patient must have failed at least two lines of anti-HER2 based therapy for advanced/metastatic cancer. Patients with documented relapse while receiving or within 6 months of completion of adjuvant or neoadjuvant trastuzumab for HER2-positive breast cancer will be considered as 1 prior line of therapy.

• HER2-positive gastric cancer - patient must have failed at least one line of anti-HER2 based therapy.

• Other refractory HER2-positive solid tumors (non-breast, non-gastric) - have no standard therapies or have failed or unable to tolerate standard therapies

• Has recovered from acute toxicities from prior anti-cancer therapies

• Left ventricular ejection fraction ≥50%

• Adequate organ function including the following:

  o Bone marrow: Absolute neutrophil (segmented and bands) count (ANC) ≥ 1.5 x 109/L Platelets ≥ 100 x 109/L Haemoglobin ≥ 8 x 109/L

  o Hepatic: Bilirubin ≤ 1.5 x upper limit of normal (ULN), ALT or AST≤ 2.5x ULN, (or ≤5 X with liver metastases)

  o Renal: Creatinine ≤ 1.5x ULN

• Signed informed consent from patient or legal representative.

• Able to comply with study-related procedures.

• Specific to cohorts 3, 4 and 5 : Patients who have a history of VTE are eligible if as long as they are receiving therapeutic/prophylactic doses of anticoagulation.

Exclusion Criteria

Patients will be excluded from the study for any of the following reasons:

• Treatment within the last 30 days with any investigational drug.
• Concurrent administration of any other tumour therapy, including cytotoxic chemotherapy, hormonal therapy, and immunotherapy.
• Major surgery within 28 days of study drug administration.
• Active infection that in the opinion of the investigator would compromise the patient's ability to tolerate therapy.
• Pregnancy.
• Breast feeding.
• Serious concomitant disorders that would compromise the safety of the patient or compromise the patient's ability to complete the study, at the discretion of the investigator.
• Active bleeding disorder or bleeding site.
• Non-healing wound.
• Poorly controlled diabetes mellitus.
• Second primary malignancy that is clinically detectable at the time of consideration for study enrolment.
• Symptomatic brain metastasis.
• History of significant neurological or mental disorder, including seizures or dementia,
• History of autoimmune disease or use of gamma immunoglobulin
• Unable to comply with study procedures

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SEQUENTIAL

Arm && Interventions

Group	Intervention	Description
Chimeric Receptor T-cells	Fludarabine and Cyclophosphosphamide	Eligible patients will undergo apheresis prior to cycle 1 therapy. Treatment comprises of trastuzumab followed by chimeric receptor T-cells in cycle 1. During Cycle 2 onwards till disease progression, patients will receive IV or SC trastuzumab only, every 3 weeks.
Chimeric Receptor T-cells	Chimeric receptor T-cells + Trastuzumab	Eligible patients will undergo apheresis prior to cycle 1 therapy. Treatment comprises of trastuzumab followed by chimeric receptor T-cells in cycle 1. During Cycle 2 onwards till disease progression, patients will receive IV or SC trastuzumab only, every 3 weeks.

Primary Outcome Measures

Name	Time	Method
Duration of tumour response	3 Years	Among tumor responders, the duration of tumor response is measured from the date of enrolment until the first date of documented disease progression or death due to any cause, whichever occurs first. Duration of tumor response will be censored at the date of the last follow-up visit for tumor responders who are still alive and who have not progressed.
Time to treatment failure	3 years	defined as the time from the date of study enrolment to the date of the first of the following events: early discontinuation of study therapy, progressive disease, or death due to any cause. Time to treatment failure will be censored at the date of the last follow-up visit for patients who did not discontinue early, who are still alive, and who have not progressed.
Progression-free survival	3 Years	is defined as the time from the date of study enrolment to the first date of documented disease progression. Progression-free survival will be censored at the date of death for patients who have not had documented disease progression. For patients who are still alive at the time of analysis and who have not had documented disease progression, progression-free survival will be censored at the date of the last follow-up visit.