Mabwell Announces Clinical Data of Multiple ADCs to be presented at 2025 ASCO Annual Meeting

SHANGHAI, May 23, 2025 /PRNewswire/ -- Mabwell (688062.SH), an innovation-driven biopharmaceutical company with entire industry chain, announced multiple clinical research results to be presented at the 2025 American Society of Clinical Oncology (ASCO) Annual Meeting, including phase Ib/II clinical study data of 9MW2821 (Bulumtatug Fuvedotin, BFv), a novel Nectin-4 targeting ADC, in combination with Toripalimab in locally advanced or metastatic uroepithelial carcinoma to be presented as oral presentation, and clinical study data of 7MW3711 and 9MW2921, a novel B7-H3 targeting ADC and a novel Trop-2 targeting ADC respectively, to be presented as poster presentations. The study of 9MW2821 was the only selected Chinese oral presentation in the field of urothelial carcinoma at this meeting.

Nectin-4 ADC (9MW2821):

In the phase Ib/II clinical study of 9MW2821 in combination with Toripalimab for the treatment of patients with locally advanced or metastatic urothelial carcinoma (la/mUc), a total of 40 patients with previously untreated for la/mUC were enrolled in the study and were treated with 9MW2821 (1.25 mg/kg) and Toripalimab (240 mg).

As of December 19, 2024, the objective response rate (ORR) was 87.5% and the confirmed ORR was 80%. The disease control rate (DCR) was 92.5%. Median progression-free survival (PFS) and duration of response (DoR) have not been achieved. No new safety signals of 9MW2821 or Toripalimab were observed in this study.

9MW2821 stands out as the first clinical-stage drug candidate among Chinese companies for this specific target. And it's the first Nectin-4 targeting ADC to disclose clinical efficacy data in cervical, esophageal, and breast cancers. Currently, 3 Phase III pivotal clinical trials are ongoing. Its monotherapy and combination therapy with Toripalimab for urothelial carcinoma have been granted Breakthrough Therapy Designation (BTD) by the Center for Drug Evaluation (CDE) of the National Medical Products Administration (NMPA) in China. It has also been granted Fast Track Designations (FTD) for 3 indications and Orphan Drug Designation (ODD) for 1 indication by the U.S. Food and Drug Administration (FDA).

B7-H3 ADC (7MW3711):

7MW3711 has enrolled 43 patients as of January 2, 2025 in a phase I/II clinical study in patients with advanced solid tumors. During the dose-escalation phase, dose-limiting toxicity (DLT) was not observed and the maximum tolerated dose (MTD) has not been reached. In patients evaluated at doses of 4.5 mg/kg or higher, the ORR for esophageal cancer, ovarian cancer, and prostate cancer was 33.3%, 60.0%, and 50.0%, respectively, and the DCR was 100%.

In the phase I/II clinical study in lung cancer patients, 37 lung cancer patients were enrolled as of January 8, 2025, including 16 small cell lung cancer (SCLC) patients and 21 non-small cell lung cancer (NSCLC) patients. Common grade ≥3 adverse reactions were neutrophil count decreased, white blood cell count decreased, anemia, lymphocyte count decreased, and platelet count decreased. Among the 25 patients who received 7MW3711 at a dose of 4.5 mg/kg or greater and completed at least one tumor evaluation, the ORR was 36.0% and the DCR was 96.0%; of these, the ORR and DCR were 62.5% and 100.0%, respectively, for patients with small-cell lung cancer at a dose of 4.5 mg/kg. Among squamous lung cancer (Sq-NSCLC) patients with a B7-H3 H-score >5, the ORR and DCR were 37.5% and 87.5%, respectively.

The study results suggest that 7MW3711 has a tolerable safety profile and good anti-tumor activity in patients with advanced tumors such as lung, esophageal, prostate and ovarian cancers.

7MW3711 was developed with Mabwell's Interchain-Disulfide Drug Conjugate (IDDC™) platform. It consists of an innovative antibody molecule, a novel linker, and a novel payload: Mtoxin™, which is a topoisomerase I inhibitor. It has been granted ODD by the FDA for the treatment of SCLC.

Trop-2 ADC (9MW2921):

In the first-in-human clinical study in patients with advanced solid tumors, a total of 39 patients were enrolled as of November 12, 2024. The most common ≥3 grade adverse were stomatitis, anemia, white blood cell count decreased, neutropenia, lymphocyte count decreased, etc. The ORR of 3.0 mg/kg dose group was 42.1% and the DCR was 84.2%. Under this dose level, the ORR and DCR was 75% and 100% for endometrial cancer, 50% and 75% for HR+/HER2- breast cancer, 50% and 100% for gastric cancer, 25% and 100% for non-squamous non-small cell lung cancer.

The study result suggests that 9MW2921 has a tolerable safety profile and good anti-tumor activity in patients with advanced tumors.

9MW2921 was developed with Mabwell's Interchain-Disulfide Drug Conjugate (IDDC™) platform. It consists of an innovative antibody molecule, a novel linker, and a novel payload: Mtoxin™, which is a topoisomerase I inhibitor. 

About Mabwell

Mabwell (688062.SH) is an innovation-driven biopharmaceutical company with the entire value chain of the pharmaceutical industry. We provide more effective and accessible therapy and innovative medicines to fulfill global medical needs. Since 2017, an advanced R&D system which covers target discovery, early discovery, druggability, preclinical, clinical research and manufacturing transformation was established. Mabwell has 16 pipeline products in different stages based on a world-class and state-of-the-art R&D engine, including 12 novel drug candidates and 4 biosimilars. We focus on the therapeutic areas of oncology, immunology, bone disorders, ophthalmology, hematology and infectious diseases, etc. Of these, 3 products have been approved and commercialized, 1 product has been filed for market approval, 3 products are in pivotal trials. We have also undertaken 1 national major scientific and technological special project for "Significant New Drugs Development", 2 projects for National Key R&D Programmes, and multiple provincial and municipal science and technological innovation projects. Mabwell's Taizhou factory possesses robust in-house manufacturing capability compliant with international GMP standards regulated by the NMPA, FDA and EMA, and has passed the EU QP Audit. The large-scale manufacturing base in Shanghai and the ADC commercialized manufacturing base in Taizhou are under construction. Our mission is "Explore Life, Benefit Health" and our vision is "Innovation, from ideas to reality". For more information, please visit www.mabwell.com/en.

Forward-Looking Statements

This press release contains forward-looking statements including, but not limited to, the potential safety, efficacy, regulatory review or approval and commercial success of our product candidates and those relating to the Company's product development, clinical studies, clinical and regulatory milestones and timelines, market opportunity, competitive position, possible or assumed future results of operations, business strategies, potential growth opportunities and other statements that are predictive in nature. "Forward-looking statements" are statements that are not historical facts and involve a number of risks and uncertainties, which may cause actual results to be materially different from any future results expressed or implied in the forward-looking statements. These statements may be identified by the use of forward-looking expressions, including, but not limited to, "expect," "anticipate," "intend," "plan," "believe," "estimate," "potential," "predict," "project," "should," "would," and similar expressions and the negatives of those terms.

Forward-looking statements are based on the Company's current expectations and assumptions. Forward-looking statements are subject to a number of risks, uncertainties, and other factors, many of which are beyond the Company's control, including, but not limited to: environment; politic; economy; society; legislation; our dependence on our product candidates, most of which are still in preclinical or various stages of clinical development; our reliance on third-party vendors, such as contract research organizations and contract manufacturing organizations; the uncertainties inherent in clinical testing; our ability to complete required clinical trials for our product candidates and obtain approval from regulatory authorities for our product candidates; our ability to protect our intellectual property; the potential impact of COVID-19; the loss of any executive officers or key personnel. In case one or more of these risks or uncertainties deteriorate, or any assumptions are incorrect, the actual results may be seriously inconsistent with the stated results.

The Company cautions all the persons not to place undue reliance on any such forward-looking statements, which speaks only as of the date of this press release. The Company disclaims any obligation, except as specifically required by law and the rules of the applicable Stock authority to publicly update or revise any such statements to reflect any change in expectations or in events, conditions, or circumstances on which any such statements may be based, or that may affect the likelihood that actual results will differ from those set forth in the forward-looking statements. All forward-looking descriptions, figures and assumptions in this press release are applicable to this statement.

SOURCE Mabwell