On February 16, 2025 Innovent Biologics, Inc. ("Innovent") (HKEX: 01801), a world-class biopharmaceutical company that develops, manufactures, and commercializes high-quality medicines for the treatment of oncology, autoimmune, cardiovascular and metabolic, ophthalmology, and other major diseases, reported that its first-in-class PD-1/IL-2α-bias bispecific antibody fusion protein, IBI363, has received its second Fast Track Designation (FTD) from the U.S. Food and Drug Administration (FDA) (Press release, Innovent Biologics, FEB 16, 2025, View Source [SID1234650312]). This designation applies to the treatment of unresectable, locally advanced, or metastatic squamous non-small cell lung cancer (sqNSCLC) that has progressed following anti-PD-(L)1 immune checkpoint inhibitor therapy and platinum-based chemotherapy. IBI363 has demonstrated encouraging efficacy and safety across multiple solid tumor types. Currently, Innovent is conducting Phase 1/2 clinical trials of IBI363 mainly in China and the U.S.
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At the World Conference on Lung Cancer (WCLC) in September 2024, IBI363 presented promising efficacy signals in patients with sqNSCLC who had previously received immunotherapy:
In the 3 mg/kg dose group, among patients with at least 12 weeks of follow-up or study completion (n=18), the objective response rate (ORR) was 50.0%, and the disease control rate (DCR) was 88.9%. The median progression-free survival (PFS) has not yet been reached and remains under follow-up.
In the 1/1.5 mg/kg dose group, the median PFS was 5.5 months (95% CI: 1.5, 8.3), with a 12-month PFS rate of 30.7%, highlighting the potential long-term benefits of immunotherapy.
Across the 1/1.5/3 mg/kg dose groups, patients with PD-L1 TPS<1% (n=22) and those with PD-L1 TPS≥1% (n=22) achieved encouraging ORRs of 36.4% and 31.8%, respectively, suggesting IBI363’s potential advantage in PD-L1 low-expression populations.
Dr. Hui Zhou, Senior Vice President of Innovent, stated, "We are pleased that IBI363 has been granted Fast Track Designation by the FDA for sqNSCLC, following its previous designation for melanoma. Earlier, we reported that in an expanded cohort of sqNSCLC patients, IBI363 showed a trend toward improved ORR and DCR at higher doses, along with a manageable safety profile. The latest PFS data from the 3 mg/kg dose group after longer follow-up further strengthens our confidence in IBI363’s potential as an immunotherapy offering long-term benefits to patients. We will present the relevant data at upcoming academic conferences this year. More encouragingly, IBI363 has demonstrated potent anti-tumor activity regardless of PD-L1 expression levels. This suggests that IBI363 may not only advance treatment for immunotherapy-resistant populations but also for cold tumors with low or no PD-L1 expression. In addition to lung cancer, we have observed encouraging efficacy signals in cold tumors, including colorectal cancer and mucosal melanoma, with melanoma already advancing to pivotal clinical stages. Moving forward, we will continue to explore IBI363 in early-line treatment and in combination therapies."
Fast Track Designation (FTD) is a regulatory process designed to expedite the clinical development and review of drugs intended to treat serious conditions and address unmet medical needs. Drug candidates granted FTD benefit from increased communication with the FDA throughout subsequent drug development, potentially accelerating their clinical development and approval process.
About IBI363 (First-in-class PD-1/IL-2α-bias bispecific antibody fusion protein))
IBI363 is a first-in-class drug candidate independently developed by Innovent Biologics. It is a PD-1/IL-2 bispecific antibody fusion protein designed to enhance efficiency while minimizing toxicity. The IL-2 arm of IBI363 has been engineered to optimize therapeutic effects with reduced side effects, while the PD-1 binding arm enables PD-1 blockade and selective IL-2 delivery. By simultaneously inhibiting the PD-1/PD-L1 pathway and activating the IL-2 pathway, IBI363 facilitates more precise and efficient targeting and activation of tumor specific T cells. Preclinical studies have shown that IBI363 exhibits strong anti-tumor activity across multiple tumor-bearing pharmacological models, including those resistant to PD-1 inhibitors and metastatic models. Additionally, it has demonstrated a favorable safety profile in preclinical models. Clinical trials are currently underway in China, the United States, and Australia to evaluate its safety, tolerability and preliminary efficacy in subjects with advanced malignancies.
About Squamous Non-Small Cell Lung Cancer (sqNSCLC)
Lung cancer is the most common and deadliest malignancy worldwide, including in China[1], posing a significant public health challenge. Non-small cell lung cancer (NSCLC) accounts for more than 80% of all lung cancer cases[2], with squamous cell carcinoma being one of its two major subtypes[2]. In recent years, immune checkpoint inhibitors have transformed the treatment landscape for NSCLC. However, for patients with NSCLC who have failed immunotherapy and lack driver gene mutations, there remains a significant and urgent unmet need for effective treatment options. The standard second- or third-line treatment, docetaxel, offers limited efficacy, with a median progression-free survival (PFS) of less than four months[3],[4]. While antibody-drug conjugates (ADCs) have shown promise, two large Phase 3 studies in squamous NSCLC have yet to demonstrate satisfactory efficacy.