Study of INBRX-109 in Conventional Chondrosarcoma

This is a randomized, blinded, placebo-controlled, Phase 2 study of INBRX-109 in unresectable or metastatic conventional chondrosarcoma patients. INBRX-109 is a recombinant humanized tetravalent antibody targeting the human death receptor 5 (DR5).

Inclusion criteria

• Conventional chondrosarcoma, unresectable (=inoperable) or metastatic.
• Measurable disease by RECISTv1.1. Note: Tumor lesions located in a previously irradiated (or other locally treated) area will be considered measurable, provided there has been clear imaging-based progression of the lesions since the time of treatment.
• Radiologic progression of disease per RECISTv1.1 criteria within 6 months prior to screening for this study.
• Adequate hematologic, coagulation, hepatic and renal function as defined per protocol.
• Eastern Cooperative Oncology Group performance status (ECOG PS) of 0 or 1.
• Estimated life expectancy of at least 12 weeks.
• Availability of archival tissue or fresh cancer biopsy are mandatory.

Exclusion criteria

• Any prior exposure to DR5 agonists.
• Allergy or sensitivity to INBRX-109 or known allergies to CHO-produced antibodies.
• Non-conventional chondrosarcoma, e.g., clear-cell, mesenchymal, extraskeletal myxoid, myxoid, and dedifferentiated chondrosarcoma.
• Prior or concurrent malignancies. Exception: Patients with a prior or concurrent malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessments.
• Chronic liver diseases. Exception: Patients with fatty liver disease are acceptable as long as adequate hepatic function as defined in the inclusion/exclusion criteria is confirmed.
• Evidence or history of multiple sclerosis (MS) or other demyelinating disorders.
• Other exclusion criteria per protocol.