At a glance
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A Phase I/II Study of Intratumoral Injection of rhuFlt3L/CDX-301 and Poly-ICLC in Combination With Low-Dose Radiotherapy in Low-Grade B-cell Lymphomas
In Brief
A Phase 2 clinical trial evaluating rhuFlt3L/CDX-301 and Poly-ICLC for Low-Grade B-cell Lymphoma. Completed, enrolled 21 participants across 1 site.
Detailed Summary
Our recent trials combining local radiotherapy with intratumoral administration of TLR agonists - referred to as 'in situ vaccination' - for patients with low-grade lymphoma demonstrated safety, induction of anti-tumor CD8 T cell responses and partial and complete remissions of patients' non-irradiated sites of disease with complete remissions lasting from months to more than three years. This iteration of the in situ vaccine approach builds on our prior work in ways that should improve its efficacy, by adding Flt3L and changing the toll-like receptors (TLR) agonist to poly-ICLC -an optimal TLR agonist for the type of dendritic cells (DC) recruited by Flt3L. The vaccine is thus in 3 phases: 1. intratumoral Flt3L administration recruits DC to the tumor 2. low-dose radiotherapy to release tumor antigens 3. intratumoral poly-ICLC administration activates tumor-antigen loaded DC
Study Details
Timeline
Interventions
rhuFlt3L/CDX-301 is a truncated, soluble, recombinant human fms-like tyrosine kinase-3 ligand (Flt3L), expressed in a Chinese hamster ovary cell. RhuFlt3L/CDX-301 is formulated as a sterile solution intended for single-use parenteral administration. Each vial contains 2.5 mg/mL rhuFlt3L/CDX-301 in a 1 mL of buffered solution composed of Sodium Phosphate and Sodium Chloride, with a pH of 7.
Poly-ICLC is supplied by Oncovir in single-dose vials containing 1 mL of 2 mg/mL opalescent white suspension. Each milliliter of Poly-ICLC for injection contains 2 mg/mL poly-IC, 1.5 mg/mL poly-L-lysine, and 5 mg/mL sodium carboxymethylcellulose in 0.9% sodium chloride solution and adjusted to pH 7.6-7.8 with sodium hydroxide.