Renal Cell Carcinoma Clinical Trial
Official title:
Cohort Study of Increasing Doses of Yttrium-90 Conjugated to Chimeric Monoclonal Antibody cG250 (^90Y-DOTA-cG250) in Patients With Advanced Renal Cancer
This was a Phase 1, open-label, dose-escalation study of yttrium-90 conjugated chimeric G250 (^90Y-DOTA-cG250) in patients with advanced, measurable clear cell renal cell carcinoma (RCC). Study objectives were to determine the safety, targeting, and dosimetry of ^90Y-DOTA-cG250, using indium-111 conjugated chimeric G250 (^111In-DOTA-cG250) as a surrogate, as well as to evaluate the immunogenicity of cG250.
Patients were enrolled sequentially into cohorts of 3 to 6 patients until determination of the maximum tolerated dose (MTD) of ^90Y-DOTA-cG250, defined as the dose level below the dose at which ≥ 2 patients experienced dose-limiting toxicity (DLT). In an attempt to mitigate liver uptake and toxicity, patients initially received a nontherapeutic injection with ^111In-DOTA-cG250 at an imaging dose of 5 mCi of ^111In + 10 mg of cG250 on Day 1. Whole body and blood measurements of radioactivity were obtained on at least 3 occasions for 1 week to determine targeting and dosimetry. Provided that protocol-specified criteria were met, including targeting to lesions > 2 cm detected on computed tomography (CT) scan, a single dose of therapeutic ^90Y-DOTA-cG250 was administered on Day 8, 9, or 10. The starting dose of ^90Y-DOTA-cG250 was 0.2 mCi/kg of ^90Y + 10 mg of cG250 administered as an intravenous (IV) infusion, with escalation of the ^90Y dose in subsequent cohorts in 0.05 to 0.1 mCi/kg increments. Patients were treated in an outpatient setting and were observed for at least 2 hours following each infusion, at which point vital signs and blood samples were obtained. Patients were followed for 6 to 8 weeks post-treatment (or after recovery from toxicity) with imaging, biochemical, serological, and hematologic tests to determine the safety of ^90Y-DOTA-cG250 and to inform dose-escalation decisions. Extent of disease evaluations, preferably by positron emission tomography (PET)/CT or standard CT, were performed at baseline and 6 to 8 weeks post-treatment (or after recovery from toxicity). Long-term follow-up was performed, when possible, every 12 weeks thereafter for up to 2 years. ;
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