On January 22, 2025 Zai Lab Limited (NASDAQ: ZLAB; HKEX: 9688) reported the U.S. Food and Drug Administration (FDA) has granted Orphan Drug Designation (ODD) to ZL-1310, a potential highly active first-in-class DLL3 antibody-drug conjugate (ADC), for the treatment of small cell lung cancer (SCLC) (Press release, Zai Laboratory, JAN 22, 2025, View Source [SID1234649838]).
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"Receiving an Orphan Drug Designation for ZL-1310 recognizes its potential to treat patients with SCLC. These patients have an urgent need for innovative treatment options with improved efficacy, safety and ready access in tertiary care and community settings," said Rafael G. Amado, M.D., President, Head of Global Research and Development, Zai Lab. "ZL-1310 has demonstrated promising objective response rates and a favorable safety profile from the ongoing Phase 1 trial in patients with recurrent SCLC recently disclosed. We look forward to continuing to advance the clinical development of this promising asset across lines of therapy in SCLC and other DLL3-expressing tumors."
ZL-1310 will be eligible for certain development incentives, including a waiver of the Prescription Drug User Fee Act registration application fee, tax credits for certain clinical trials and the potential to receive a seven-year U.S. market exclusivity period granted upon product approval.
This important regulatory designation follows promising data from the ongoing global Phase 1a/1b study in patients with previously treated extensive-stage SCLC (ES-SCLC) after at least one prior platinum-based chemotherapy regimen, which was presented at the EORTC-NCI-AACR (Free EORTC-NCI-AACR Whitepaper) (ENA) Symposium 2024 in October 2024.
About ZL-1310
ZL-1310 is a novel ADC in Zai Lab’s growing, global oncology pipeline that targets Delta-like ligand 3 (DLL3), an antigen that is overexpressed in many neuroendocrine tumors, is typically associated with poor clinical outcomes, and is a validated therapeutic target for SCLC. ZL-1310 comprises a humanized anti-DLL3 monoclonal antibody linked to a novel camptothecin derivative (a topoisomerase 1 inhibitor) as its payload. The compound was designed with a novel ADC technology platform called TMALIN, which leverages the tumor microenvironment to overcome challenges associated with first-generation ADC therapies, including off-target payload toxicity.
The ongoing Phase 1a/1b clinical trial is evaluating ZL-1310 as monotherapy and in combination with atezolizumab, an immune checkpoint inhibitor, for the treatment of ES-SCLC.
About Small Cell Lung Cancer (SCLC)
SCLC is one of the most aggressive and lethal solid tumors, accounting for ~15% of approximately 2.5 million patients diagnosed with lung cancer worldwide each year1,2. Two-thirds of all SCLC patients are diagnosed at extensive stage3, which is associated with high rates of relapse and poor prognosis. The outcomes of the patients with ES-SCLC are dismal, with median survival of approximately 12 months following initial therapy4 and a 5~10% overall five-year survival rate5. Treatment options are limited when patients progress, with the current standard of care resulting in limited clinical benefit. Despite recent advancements, new readily available treatment options with improved efficacy and manageable safety are needed.