A Phase I Trial of T Cells Expressing an Anti-GD2 Chimeric Antigen Receptor in Children and Young Adults With GD2+ Solid Tumors

Study Summary

Background GD2 is a well-characterized tumor antigen in neuroblastoma, which is also expressed on osteosarcomas and some other sarcomas. T cells expressing 1st generation anti-GD2 chimeric antigen receptors (CARs) were safe and mediated modest antitumor activity in some patients with refractory neuroblastoma. A 3rd generation anti-GD2-CAR (GD2-CAR.OX40.28.z.ICD9) has been produced and holds promise for increased activity compared to the 1st generation GD2-CAR already studied in clinical trials. As an added safety measure, the vector includes a suicide switch comprising a caspase dimerization domain (ICD9) that can be activated by a small molecule to induce death of the genetically engineered cells if they were induce untoward toxicity. Objectives Primary:Determine the feasibility of producing anti GD2-CAR cells meeting the established release criteria and to assess the safety of administering escalating doses of anti-GD2-CAR engineered T cells in children and young adults with GD2+ solid tumors, including neuroblastoma, following cyclophosphamide-based lymphodepletion. Secondary: 1. Determine if administration anti-GD2-CAR engineered T cells mediate antitumor effects in children and young adults with GD2+ solid tumors; 2. Measure persistence of adoptively transferred anti-GD2-CAR T cells and correlate this with antitumor effects; 3. Extend information regarding the prevalence and intensity of GD2 expression in non-neuroblastoma, non-osteosarcoma solid tumors in children and young adults; 4. If unacceptable toxicity occurs that is possibly, probably or likely related to anti-GD2-CAR T cells, assess the capacity for AP1903, a dimerizing agent, to mediate clearance of the genetically engineered cells and resolve toxicity; and 5. Assess toxicity of AP1903 if administered to mediate clearance of anti-GD2-CAR T cells. Eligibility Patients 1-35 years of age, at least 15 kg, with osteosarcoma or a GD2+ solid tumor (including neuroblastoma) that has recurred after or

Primary Outcome

Determine the feasibility of producing anti-GD2-CAR cells meeting the established release criteria and to assess the safety of administering escalating doses of autologous anti-GD2-CAR (anti-GD2.28.z.OX40.ICD9) engineered T cells in children and young adults with osteosarcoma and GD2+ solid tumors (excluding neuroblastoma) following cyclophosphamide based lymphodepletion.

Conditions Studied

Interventions

• DRUG Cyclophosphamide
• DRUG AP1903
• BIOLOGICAL Anti-GD2-CAR engineered T cells

Study Locations (1)