Zai Lab Receives EMA Orphan Drug Designation for Zocilurtatug Pelitecan (Zoci) in Pulmonary Neuroendocrine Carcinomas

Key Terms

orphan drug designation regulatory

Orphan drug designation is a special status given to medicines developed to treat rare diseases affecting only a small number of people. This status often provides benefits like faster approval processes and financial incentives, making it more attractive for companies to develop these drugs. For investors, it signals potential for exclusive market rights and reduced competition, which can impact the drug’s profitability.

fast track designation regulatory

Fast track designation is a status the U.S. Food and Drug Administration grants to drugs intended to treat serious conditions and address an unmet medical need. It gives the developer more frequent communication with the FDA and can allow parts of the application to be reviewed on a rolling basis, and it may pave the way to priority review or accelerated approval. It can shorten development timelines, though it does not guarantee approval.

antibody-drug conjugate medical

An antibody-drug conjugate is a targeted medicine that combines an antibody, which can identify specific cells, with a powerful drug designed to destroy those cells. This approach allows for precise treatment, minimizing damage to healthy tissue. For investors, developments in this area can signal advances in cancer therapies and potential growth opportunities in the biotech sector.

neuroendocrine carcinomas medical

Neuroendocrine carcinomas are cancers that arise from neuroendocrine cells—briefly, hybrid cells that both sense signals like nerve cells and release hormones—forming malignant tumors in organs such as the lungs, pancreas and digestive tract. They matter to investors because they often need specialized tests and targeted therapies; clinical trial outcomes, regulatory approvals and pricing or reimbursement decisions for new diagnostics or drugs can materially affect the commercial prospects of companies working in this space.

small cell lung cancer medical

A fast-growing form of lung cancer that tends to spread early to other organs, making it harder to treat than many slower-moving tumors. Investors care because its aggressive nature creates urgent demand for effective drugs, diagnostics and treatments; clinical trial results, regulatory decisions, or new therapies for this disease can quickly reshape a company’s revenue prospects much like a breakthrough product can transform a business in any industry.

extrapulmonary neuroendocrine carcinomas medical

Extrapulmonary neuroendocrine carcinomas are rare, often aggressive cancers that start in hormone-producing cells located outside the lungs, such as in the digestive tract, pancreas, or skin. They matter to investors because their rarity and severity create high unmet medical need, shaping the size and risk of drug development programs, regulatory reviews, clinical-trial design, and potential market value for diagnostics and therapies — similar to how a small but urgent niche can drive strong demand for a specialized product.

delta-like ligand 3 medical

Delta-like ligand 3 (DLL3) is a protein on the surface of some cells that helps control how cells communicate and develop; in many cancers it is unusually abundant on tumor cells but scarce on healthy cells. Investors care because DLL3 can serve as a precise target for drugs, antibody therapies, or diagnostic tests—like a distinctive address that lets treatments find cancer cells—so trial results, approvals, or diagnostic adoption can materially affect a biotech company's value.

committee for orphan medicinal products regulatory

A Committee for Orphan Medicinal Products is a regulatory expert panel that assesses whether a drug or therapy qualifies for special status because it treats a rare disease. Earning that designation typically brings incentives such as reduced fees, protocol support and a period of market protection, so investors watch these decisions as a signal that a treatment may face less competition and have stronger commercial and regulatory advantages—like gaining a protected license.

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- European Medicines Agency’s Committee for Orphan Medicinal Products recognized zoci’s preliminary clinical data as suggestive of a clinically relevant advantage over currently authorized therapies in relapsed or refractory extensive-stage small cell lung cancer (SCLC)
- SCLC is the most significant pulmonary neuroendocrine carcinoma (NEC), affecting an estimated 375,000 patients annually worldwide, with limited treatment options
- EMA designation for zoci in pulmonary NECs closely follows receipt of Fast Track designation from the U.S. Food and Drug Administration for zoci in extrapulmonary neuroendocrine carcinomas (epNECs) and promising data presented at the AACR Annual Meeting in April 2026

SHANGHAI & CAMBRIDGE, Mass.--(BUSINESS WIRE)-- Zai Lab Limited (NASDAQ: ZLAB; HKEX: 9688) today announced the European Medicines Agency (EMA) has granted Orphan Drug Designation (ODD) to zocilurtatug pelitecan (zoci, formerly ZL-1310), the Company’s potential first-in-class Delta-like ligand 3 (DLL3)-targeting antibody-drug conjugate (ADC), for the treatment of pulmonary neuroendocrine carcinomas (NECs).

The designation follows a positive opinion from the EMA’s Committee for Orphan Medicinal Products (COMP), recognizing both the seriousness of neuroendocrine carcinomas and the need for new treatment options. Small cell lung cancer (SCLC) is the most significant pulmonary NEC, accounting for around 15% of the approximately 2.5 million patients diagnosed with lung cancer worldwide each year (an estimated 375,000 new cases annually), and is one of the most aggressive and lethal solid tumors. ^1,2

In granting the designation, the COMP noted that preliminary clinical data in patients with relapsed or refractory extensive-stage SCLC suggest zoci may offer a more favorable effect than currently authorized therapies, including durable responses, a finding the Committee characterized as a clinically relevant advantage.

The U.S. FDA previously granted Fast Track designation (FTD) and ODD to zoci for SCLC. The FDA also recently granted FTD to zoci for extrapulmonary NECs (epNECs).

“This important designation from the EMA supports zoci’s potential to become a first-in-class therapy for pulmonary neuroendocrine carcinomas,” said Rafael G. Amado, M.D., President, Head of Global Research and Development at Zai Lab. “This milestone is another demonstration of Zai Lab’s commitment to address critical unmet needs for patients with limited treatment options.”

The EMA’s ODD provides important regulatory and development incentives, including potential market exclusivity following approval, reduced development fees, and enhanced development efficiency, which may help streamline clinical development.

About Zocilurtatug Pelitecan (Zoci, ZL-1310)

Zoci targets Delta-like ligand 3 (DLL3), a validated therapeutic target that is overexpressed in many neuroendocrine carcinomas, such as small cell lung cancer (SCLC) and extrapulmonary neuroendocrine carcinomas (epNECs), and is generally associated with poor clinical outcomes. Zoci is on track to potentially become Zai Lab’s first global oncology launch, with plans for three registration-enabling studies across second- and third-line SCLC, first-line SCLC, and epNECs by the end of 2026. Its potential best-in-class safety profile, coupled with compelling systemic and intracranial efficacy, supports its potential role as a new standard of care in previously treated extensive stage SCLC, as well as a backbone DLL3-targeting antibody-drug conjugate (ADC) in first line combination regimens, including those that reduce the burdens of chemotherapy, such as check point inhibitors and T-cell engagers.

About Zai Lab

Zai Lab Limited (NASDAQ: ZLAB; HKEX: 9688) is an innovative, research-based, commercial-stage biopharmaceutical company based in China and the United States. We are focused on discovering, developing, and commercializing innovative products that address medical conditions with significant unmet needs in the areas of oncology, immunology, neuroscience, and infectious disease. Our goal is to leverage our competencies and resources to positively impact human health.

For additional information about Zai Lab, please visit www.zailaboratory.com or follow us at https://x.com/ZaiLab_Global.

Zai Lab Forward-Looking Statements

This press release contains forward-looking statements relating to our future expectations, plans, and prospects, for Zai Lab, including, without limitation, statements relating to our prospects and plans for developing and commercializing zoci, the potential benefits of zoci, and the potential treatment of small cell lung cancer and other neuroendocrine carcinomas and solid tumors. All statements, other than statements of historical fact, included in this press release are forward-looking statements, and can be identified by words such as “aim,” “anticipate,” “believe,” “could,” “estimate,” “expect,” “forecast,” “goal,” “intend,” “may,” “plan,” “possible,” “potential,” “will,” “would,” and other similar expressions. Such statements constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are not guarantees or assurances of future performance. Forward-looking statements are based on our expectations and assumptions as of the date of this press release and are subject to inherent uncertainties, risks and changes in circumstances that may differ materially from those contemplated by the forward-looking statements. We may not actually achieve the plans, carry out the intentions or meet the expectations or projections disclosed in our forward-looking statements, and you should not place undue reliance on these forward-looking statements. Actual results may differ materially from those indicated by forward-looking statements as a result of various important factors, including but not limited to (1) our ability to successfully commercialize and generate revenue from our approved products, (2) our ability to obtain funding for our operations and business initiatives, (3) the results of our clinical and pre-clinical development of our product candidates, (4) the content and timing of decisions made by the relevant regulatory authorities regarding regulatory approvals of our product candidates, (5) risks related to doing business in China, and (6) other factors identified in our most recent annual and quarterly reports and in other reports we have filed with the U.S. Securities and Exchange Commission (SEC). We anticipate that subsequent events and developments will cause our expectations and assumptions to change, and we undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise, except as may be required by law. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to the date of this press release.

Our SEC filings can be found on our website at www.zailaboratory.com and on the SEC’s website at www.SEC.gov.

References:

1 J Thorac Oncol. 2023 Jan:18(1):31-46; Lung Cancer Foundation of America

2 WHO Globocan 2022

 

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For more information, please contact:

Investor Relations:
Christine Chiou / Cyan Liu
+1 (917) 886-6929 / +86 195 3130 8895
christine.chiou1@zailaboratory.com / cyan.liu@zailaboratory.com

Media:
Shaun Maccoun / Xiaoyu Chen
+1 (857) 270-8854 / +86 185 0015 5011
shaun.maccoun@zailaboratory.com / xiaoyu.chen@zailaboratory.com

Source: Zai Lab Limited