Alligator Bioscience announces that data from the ongoing OPTIMIZE-1 Phase 2 study of the company's lead asset mitazalimab in 1st line metastatic pancreatic cancer will be presented at the 2023 American Society of Clinical Oncology (ASCO) Annual Meeting, being held in Chicago, June 2-6. The data presented at ASCO demonstrate that mitazalimab in combination with mFOLFIRINOX is a feasible treatment regimen for 1st line pancreatic cancer patients with encouraging interim efficacy and well-manageable safety profile, consistent with mFOLFIRINOX monotherapy. Combination with mFOLFIRINOX had no impact on mitazalimab pharmacokinetics and the pharmacodynamic biomarker profile in peripheral blood confirmed the immune activation profile typical of mitazalimab. When administered at 900 µg/kg in combination with mFOLFIRINOX, mitazalimab showed robust anti-tumor activity in 23 mPDAC patients, meriting continued development.

An objective response rate (ORR) of 52% was demonstrated with clinically meaningful tumor reduction in 12 of the 23 evaluable patients, which compares favorably to the 31.6%[1] reported with FOLFIRINOX in a similar patient population. The analysis also revealed: 8 patients achieved stable disease resulting in a 91% disease control rate (DCR), 6 of the 7 patients who began treatment at least 6 months prior to the interim analysis cutoff were still on treatment, and of these, 2 patients had been receiving treatment for over 11 months.