ImmunityBio BLA for Bladder Cancer Therapy
ImmunityBio has submitted a BLA for N-803, which it describes as a first-in-class IL-15 superagonist, plus Bacillus Calmette-Guérin (BCG) for treating BCG-unresponsive non-muscle invasive bladder cancer carcinoma in situ. The submission is based on data from the company’s pivotal QUILT 3032 study (NCT03022825), where 71% of patients who had failed on previous therapies showed an over 50% increase in both response and median duration compared to the FDA-approved alternatives valrubicin and pembrolizumab.
The company says the treatment can be delivered directly to the bladder (intravesically) to induce natural killer cells and T cells, thus “providing a new treatment option for patients with this form of bladder cancer.” It says the therapy, if approved, would give patients a greater chance to avoid removal of the bladder itself (radical cystectomy).
N-803 is believed to work by stimulating CD8+ T cells and NK cells through beta gamma T-cell receptor binding (not alpha) while avoiding T-reg stimulation, ImmunityBio says.