2025 ASCO Presentation: Innovent Biologics Announces Updated Data of IBI354 (Novel anti-HER2 ADC) From the Phase 1/2 Clinical Study in Advanced Ovarian Cancer, Breast Cancer and Other Solid Tumors
SAN FRANCISCO and SUZHOU, China, June 2, 2025 /PRNewswire/ -- Innovent Biologics, Inc. ("Innovent") (HKEX: 01801), a world-class biopharmaceutical company that develops, manufactures and commercializes high-quality medicines for the treatment of oncologic, autoimmune, cardiovascular and metabolic, ophthalmologic and other major diseases, updated the clinical data of IBI354 (HER2 monoclonal antibody-camptothecin derivative conjugate) in advanced solid tumors at the 2025 American Society of Clinical Oncology (ASCO) Annual Meeting.
IBI354 has demonstrated promising anti-tumor efficacy and favorable safety profiles across multiple solid tumors. It not only holds potential to deliver a new generation of ADC therapies characterized by "high potency and low-toxicity" for tumor types such as ovarian cancer and breast cancer, but also validates the advantages of Innovent's ADC technology platform. The results of IBI354 lays the foundation for the subsequent development of Innovent's next-generation of bispecific ADCs and dual-payload ADCs, marking a milestone in Innovent's next-generation "IO+ADC" oncology development strategy.
The data presented is from a Phase 1/2 clinical study (NCT05636215) aimed at evaluating the safety, tolerability, and preliminary efficacy of IBI354 in participants with advanced solid tumors. As of March 24, 2025, a total of 368 participants with advanced solid tumors were enrolled and received different doses of IBI354 monotherapy, the median follow-up duration was 11.5 months (range: 0.7-19.6), the median treatment duration was 27.0 weeks (range: 3.1-81.3) and 74 (20.1%) pts were still on treatment. The tumor types including 178 with breast cancer, 92 with ovarian cancer, 38 with colorectal cancer, and 60 with other tumors.
The dosage was escalated to 18mg/kg, with no DLT events observed.
The most common treatment-related adverse events (TRAEs) were anemia, nausea, and white blood cell count decreased. The incidence of interstitial lung disease (ILD) was only 1.9%, all were grade 1-2.
Overall, 27.4% of patients experienced TRAEs ≥ grade 3, 17.7% experienced TRAEs leading to dose interruption, 2.7% experienced TRAEs leading to dose reduction and 1.6% experienced TRAEs leading to discontinuation, with no TRAEs leading to death.
IBI354 monotherapy showed promising efficacy signals in multiple tumor types
In HER2-positive breast cancer cohort (n= 88, treated at 6~15mg/kg, the median prior treatment lines was 4), the confirmed objective response rate (ORR) and the disease control rate (DCR) were 59.1% and 90.9%, respectively. In 9 mg/kg Q3W subgroup (n=29), the ORR and the DCR were 72.4% and 89.7%, respectively. The median progression-free survival (PFS) was 14.1 months (95% CI: 8.3-not calculable [NC]) with events of 48.3%. The median overall survival (OS) was immature with events of 3.4%.
In ovarian cancer cohort (n=92, treated at 2~12mg/kg, the median prior treatment lines was 3), the cORR was 41.2% and the DCR was 82.0%. In the 12mg/kg Q3W subgroup (n=40), the cORR reached 55.0% and the DCR was 90.0%. In participants with HER2 1+ (n=27), the ORR reached 55.6% and the DCR was 88.9%. As of the data cutoff date, the median follow-up time was 11.9 months, and the median PFS was 7.1 months (95% CI: 5.2−10.8) in 12mg/kg Q3W dose group. The median OS was not mature with events in 14 (34.1%) pts and a 12-month OS rate of 63.9% (95% CI: 45.0−77.8).
Professor Qi Zhou, Chief Physician at the Gynecologic Oncology Center of Chongqing University Affiliated Cancer Hospital and the Principal Investigator of the gynecologic oncology cohort study, stated, "The treatment of platinum-resistant recurrent ovarian cancer is difficult and the prognosis is poor, threatening the life and health of women. Extending PFS and OS in platinum-resistant recurrent ovarian cancer patients remains a clinical challenge for gynecological oncologists. ADC drugs provide a new direction for overcoming resistance mechanisms by precisely delivering cytotoxic agents. HER2, as a validated solid tumor target, has made breakthroughs in breast and gastric cancer fields, while the novel ADC drug IBI354 shows broad-spectrum antitumor activity through unique design in HER2 low-expression (IHC 1+) platinum-resistant ovarian cancer. In the Phase 1 study with a dose of 12mg/kg Q3W, IBI354 demonstrated an ORR of 55.0% and DCR of 90.0%, with a median PFS reaching 7.1 months. The safety profile was very good without common severe interstitial lung disease or ocular toxicity seen in other ADCs. These results significantly outperform traditional chemotherapy regimens, suggesting its potential breakthrough efficacy in the platinum-resistant population. The Phase 3 study of IBI354 in platinum-resistant ovarian cancer (HeriCare-Ovarian01) has been initiated, and I am looking forward to the results, as well as the further validation of the long-term benefits for patients receiving IBI354."
Doctor Charlotte Rose Lemech from Scientia Clinical Research Ltd, Australia, stated: "Breast cancer is one of the most common malignant tumors among women globally and remains a leading cause of cancer-related deaths. The amplification or overexpression of HER2 (human epidermal growth factor receptor 2) is recognized as a key driver in the development, progression, and metastasis of breast cancer, with approximately 15%-20% of breast cancer patients exhibiting HER2 overexpression. ADCs have become the new standard treatment for later line HER2 positive breast cancer. In this Phase 1 study, IBI354 has demonstrated encouraging efficacy and safety data, achieving high ORR and DCR especially in 9 mg/kg Q3W subgroup. Long term survival was also achieved with the median PFS of 14.1 months. IBI354 also differentiates itself from other HER2 targeted therapies with its safety profile. The incidence of interstitial lung disease was extremely low and most of the hematological toxicity and gastrointestinal adverse events were mild to moderate and can be effectively managed with standard supportive care. This favorable safety profile enhances the clinical application potential of IBI354 and we look forward to IBI354 achieving more breakthroughs in the field of breast cancer treatment."
Dr. Hui Zhou, Senior Vice President of Innovent, stated: "With the rapid development of ADC drugs in the field of tumor treatment, Innovent is steadily advancing its strategic layout in the ADC field. At this year's ASCO conference, we update the safety and efficacy data of IBI354 across various advanced solid tumors. These clinical results not only confirm the potential therapeutic value of IBI354 but also demonstrating Innovent's innovative strength and technological advantages in ADC drug development. The phase 3 study of IBI354 in platinum-resistant ovarian cancer has been initiated, and more clinical studies are also planned. We will continue to invest in next-generation ADC molecules, aiming to address unmet clinical needs and bring patients with more effective and safer treatment options."
About IBI354 (Anti-HER2 Antibody-Camptothecin Derivative Conjugate)
IBI354 is an innovative HER2-targeted antibody–camptocinin derivative conjugate developed by Innovent's proprietary SoloTx ADC platform. With a drug-to-antibody ratio (DAR) of 8, IBI354 delivers a high payload of effective drugs to tumors. The highly hydrophilic linker design contributes to its excellent biophysical and pharmacokinetic (PK) properties, while the hydrophobic payload enhances its bystander effect, targeting adjacent antigen-low or negative tumor cells. IBI354 exhibits extremely low exposure of free toxin in circulation and has an ideal safety profile based on pre-clinical and clinical studies. IBI354 has demonstrated remarkable anti-tumor activity in various tumor-bearing mice models, particularly in those resistant to HER2-targeted therapies and in metastatic tumors. Innovent Biologics is conducting clinical studies to assess the efficacy and safety of IBI354 for multiple advanced solid tumors.
About Innovent
Innovent is a leading biopharmaceutical company founded in 2011 with the mission to empower patients worldwide with affordable, high-quality biopharmaceuticals. The company discovers, develops, manufactures and commercializes innovative medicines that target some of the most intractable diseases. Its pioneering therapies treat cancer, cardiovascular and metabolic, autoimmune and eye diseases. Innovent has launched 15 products in the market. It has 3 new drug applications under regulatory review, 4 assets in Phase III or pivotal clinical trials and 15 more molecules in early clinical stage. Innovent partners with over 30 global healthcare companies, including Eli Lilly, Sanofi, Incyte, Adimab, LG Chem and MD Anderson Cancer Center.
Guided by the motto, "Start with Integrity, Succeed through Action," Innovent maintains the highest standard of industry practices and works collaboratively to advance the biopharmaceutical industry so that first-rate pharmaceutical drugs can become widely accessible. For more information, visit www.innoventbio.com, or follow Innovent on Facebook and LinkedIn.
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