May 13, 2026｜2026
Henlius' potential BIC oral KAT6A/B inhibitor HLX97 completes first patient dosing in Phase 1, aiming to overcome endocrine therapy resistance in breast cancer
Shanghai, China, May 13, 2026 — Shanghai Henlius Biotech, Inc. (2696.HK) announced that the first patient has been dosed in a Phase 1 clinical trial of HLX97, a novel oral lysine acetyltransferase 6A/B (KAT6A/B) small molecule inhibitor, in patients with advanced or metastatic solid tumors in China. Previously, the Investigational New Drug (IND) application for HLX97 in advanced/metastatic solid tumors was approved by the China National Medical Products Administration (NMPA).
Breast cancer is the second most common cancer worldwide and the most common malignant tumor among women, and it is also a leading cause of cancer-related death in women. ER-positive (ER+) breast cancer is the most prevalent subtype, accounting for approximately 70% of all cases.1 While endocrine therapies—such as estrogen suppression and direct targeting of the estrogen receptor—have become the cornerstone of treatment and significantly reduced recurrence and mortality, both primary and acquired resistance remain major clinical challenges.
KAT6A (Lysine Acetyltransferase 6A) and its paralog KAT6B (Lysine Acetyltransferase 6B) are members of the MYST family of histone acetyltransferases (HATs) and play key roles in tumorigenesis, disease progression, and the development of drug resistance across multiple cancer types. Preclinical and clinical studies have shown that amplification and/or overexpression of the KAT6A gene is closely associated with endocrine resistance in heavily pretreated patients with ER+/HER2- metastatic breast cancer. In addition, aberrant expression of KAT6A/B has been observed in a range of solid tumors, including ovarian, cervical, colorectal, prostate, lung cancers, and gliomas, suggesting broad therapeutic potential for KAT6A/B inhibitors across tumor types.2-4 Given that amplification and/or overexpression of the KAT6A gene in breast cancer has been shown to be closely associated with the development of endocrine resistance, targeting KAT6A/B activity may represent a promising strategy to overcome endocrine therapy resistance in breast cancer.5-6
HLX97 is a novel oral KAT6A/B inhibitor with best-in-class potential. By selectively inhibiting KAT6A/B activity, HLX97 is designed to regulate tumor cell proliferation and induce apoptosis. It demonstrates high selectivity and favorable pharmacokinetic properties characterized by rapid onset and clearance, aiming to maximize antitumor activity while minimizing hematological toxicity. Preclinical studies have shown that HLX97 effectively inhibits KAT6A/B activity and exhibits strong antitumor efficacy with a favorable safety profile. In animal models, HLX97 demonstrated significant efficacy in ER-positive breast cancer as well as in human-derived xenograft models resistant to both fulvestrant and palbociclib (a CDK4/6 inhibitor), with good overall tolerability.
Henlius has built a comprehensive pipeline covering the full continuum of breast cancer care through internal innovation and strategic collaborations. Its marketed products include HANQUYOU (trade name: HERCESSI™ in the U.S., Zercepac® in Europe), a trastuzumab biosimilar approved in over 50 countries and regions including China, the U.S., and Europe; POHERDY®, the first pertuzumab biosimilar approved in the U.S.; HANNAIJIA (neratinib), an extended adjuvant therapy for early-stage breast cancer, and CDK4/6 inhibitor FUTUONING (fovinaciclib). Meanwhile, Henlius is advancing next-generation molecules such as novel epitope anti-HER2 antibody HLX22, oral selective estrogen receptor modulator (SERM) lasofoxifene (HLX78), KAT6A/B inhibitor HLX97, LIV-1-targeting ADC HLX41, HER2×HER2 bispecific epitope ADC HLX49 and HER2 ADC HLX87 through its robust innovation platforms and collaborative R&D. Building on this foundation, Henlius remains committed to advancing monotherapies and combination regimens across all breast cancer subtypes, enhancing therapeutic value through strengthened pipeline synergies.
Moving forward, Henlius will continue to focus on unmet clinical needs by fully leveraging its integrated platform advantages in antibody-based drugs, expanding disease areas, accelerating the development of differentiated molecules, and bringing more high-quality, affordable innovative therapies to patients worldwide.
About HLX97-FIH101
This study is a multicenter, open-label phase 1 clinical trial designed to evaluate the safety, tolerability, pharmacokinetic (“PK”) characteristics, and preliminary antitumor activity of HLX97 in patients with advanced or metastatic solid tumors. The study consists of two parts: Part 1 is the dose‑escalation phase, which includes monotherapy dose escalation (Part 1A) and combination therapy dose escalation (Part 1B); Part 2 is the dose‑expansion phase. Part 1A, the monotherapy dose‑escalation phase, will be conducted in patients with advanced/metastatic solid tumors and will include five dose levels ranging from 1.0 mg to 15.0 mg. HLX97 will be administered orally from Day1 to Day28 of each cycle, once a day, for 4 weeks each cycle. Part 1B, the combination therapy dose‑escalation phase, will explore 2 to 3 dose levels of HLX97 in combination with fulvestrant in patients with HR‑positive, HER2‑negative locally advanced or metastatic breast cancer. Part 2 will be conducted in patients with HR‑positive, HER2‑negative locally advanced or metastatic breast cancer and will include 3 treatment groups: two groups receiving different doses of HLX97 in combination with fulvestrant, and one group receiving fulvestrant monotherapy. The primary endpoints of Part 1 are to evaluate the incidence of dose‑limiting toxicities (DLT) and to determine the maximum tolerated dose (MTD) of HLX97 as monotherapy and in combination with fulvestrant. The primary endpoints of Part 2 are the objective response rate (ORR) and progression‑free survival (PFS) as assessed by the investigator according to RECIST version 1.1, as well as the recommended Phase 2 dose (RP2D) of HLX97 in combination with fulvestrant. Secondary endpoints include the safety of HLX97 as monotherapy and in combination, PK parameters, additional efficacy endpoints (such as duration of response (DOR), disease control rate (DCR), and overall survival (OS)), and exploratory pharmacodynamic and predictive biomarker analyses.
References
1. Nolan E, et al. Deciphering breast cancer: from biology to the clinic. Cell. 2023;186(8):1708-1728.
2. Chen J, et al. Mutations of Chromatin Structure Regulating Genes in Human Malignancies. Curr Protein Pept. Sci. 2016;17(5):411-437.
3. Partynska A, et al. The Expression of Histone Acetyltransferase KAT6A in Non-small Cell Lung Cancer. Anticancer Res. 2022;42(12):5731-5741.
4. Lv D, et al. Histone Acetyltransferase KAT6A Upregulates PI3K/AKT Signaling through TRIM24 Binding. Cancer Res. 2017;77(22):6190-6201.
5. Sharma S, et al. Discovery of a highly potent, selective, orally bioavailable inhibitor of KAT6A/B histone acetyltransferases with efficacy against KAT6A-high ER+ breast cancer. Cell Chem Biol. 2023;30(10):1191-1210.e20.
6. Yu L, et al. Identification of MYST3 as a novel epigenetic activator of ERα frequently amplified in breast cancer. Oncogene. 2017;36(20):2910-2918.
Back
Privacy Policy
Cookies Policy
Accessibility
Terms of Use
Privacy Policy
Introduction
Shanghai Henlius Biotech, Inc., and, where applicable, its affiliates and subsidiaries (collectively, “we” , “us” or “our”) attach great importance to the protection of your privacy and personal information. This Privacy Notice (this “Policy”) is formulated in accordance with applicable PRC laws and regulations governing the protection of personal information in the People’s Republic of China (“PRC”).
This Policy applies when: (1) you browse or use our website and other online resources (such as our WeChat official accounts); (2) subscribe to our news or announcements; or (3) contact us through the contact details or other interactive features made available on our website, or otherwise interact with us through our website.. The purpose of this Policy is to explain how and why we process your personal information, the types of personal information involved, applicable retention periods, your rights, and the measures we take to protect personal information. Please read this Policy carefully to ensure that you fully understand its content.
In certain business scenarios, we may provide additional explanations regarding the processing of your personal information through separate agreements, privacy statements, or personal information notices. In the event of any inconsistency, such documents shall prevail. For example, where a recruitment function is provided through a third-party platform or service, the relevant third party privacy policy or notice may also apply.
For the purposes of this Policy, “personal information” refers to all kinds of information related to identified or identifiable natural persons, excluding anonymized information.
We collect, use, store, transfer and otherwise process personal information in strict compliance with applicable PRC laws and regulations of the People’s Republic of China.
Our website may contain links to third party websites for your convenience. We do not control, and are not responsible for, the privacy practices of such third parties. We encourage you to review their privacy policies before using those websites.
If you have any questions or concerns regarding this Policy or our processing of personal information, please contact us using the details provided below.
This Policy will help you understand:
I. How we collect your personal information
II. How we use your personal information
III. How we entrust, share, transfer and publicly disclose your personal information
IV. Cross border transfer of personal information
V. How we store your personal information
VI. Security measures
VII. Your rights
VIII. Personal information of minors
IX. Updates to this Policy
X. How to contact us
I. How do we collect your personal information?
In addition to our employees, we may process personal information of the following persons:
• Visitors and users of our website;
• Healthcare Professionals;
• Investigators of clinical trial institutions and personnel of contract research organizations in clinical trials;
• Subjects of clinical trials and their relatives;
• Consumers/patients and their relatives using our products or services;
• Staff of business partners (including vendors, distributors, partners, etc.); and
• Our applicants.
We may process personal information of website visitors and individuals who contact or interact with us through our website or other online resources. Depending on the relevant page, function, or interaction, separate privacy notices, consents, platform privacy policies, contracts, or other notices may apply.
Based on the context in which you interact with us, we may collect personal information by the following means and on the legal bases permitted by applicable PRC laws and regulations, including your consent, the necessity for entering into or performing a contract, compliance with legal obligations, protection of life, health or property, public health needs, or other circumstances permitted by law:
• Your personal information provided to us voluntarily
When you subscribe to our news or announcements, contact us through the contact details or other interactive features made available on our website, a third-party platform or service linked or referred to on our website, or otherwise communicate with us in relation to our website, we may collect the personal information that you voluntarily provide, such as your name, contact details, organization, and the content of your inquiry or request, depending on the relevant page or function.
• Personal information collected by us independently through our website and other online channels
When you visit our website, most of our services do not require any registration, and you can visit our website without telling us who you are. However, some pages or functions may require you to provide certain personal information. If you choose not provide such information as we request, you may not be able to access certain content or functions or we may not be able to respond to your inquiry, request or subscription. Please refer to the relevant page or notice for further details about the categories of personal information collected in a specific scenario.
• Personal information we collect from vendors or business partners
In the course of our daily business operations, we may collect personal information from our vendors or business partners. We require our vendors and business partners to comply with the requirements of the personal information protection laws and regulations of the PRC and to lawfully provide us with personal information. If you are an employee or representative of one of our vendors or business partners, we may collect personal information such as your name and contact details for the purpose of establishing business contacts and cooperations.
• Personal information we collect from publicly available sources
We may collect personal information of medical and healthcare professionals from such publicy available sources, such as the official websites of medical institutions and the official websites of competent government departments, and process such information within a reasonable scope and for lawful purposes. For example, for the purpose of lawful academic or professional interaction with healthcare professionals, we may collect the name, gender, employer, position, practitioner registration information, academic title, degree, educational background, specialty expertise, and profile information, where such information has been lawfully made public.
Our website may include links, contact details, QR codes, or references to third-party platforms or services. Where you choose to interact with us through such third-party platforms or services, the relevant third party may also process your personal information in accordance with its own privacy policy and applicable law, and we encourage you to review such policy before submitting your information.
II. How do we use your personal information?
We may use your personal information for the following purposes:
• Operating, maintaining and improving our website and other online resource;
• Researching, developing, providing and continuously improving our products and services;
• Conducting and managing daily business;
• Academic interaction with healthcare professionals;
• Responding to your inquiries, requests, or communications sent through our website or the contact details made available on our website;
• Providing subscription services for our news, announcements, or investor-related updates;
• Managing and maintaining our relationship and communications with business contacts who reach us through our website;
• Recruiting and human resource management;
• Internal compliance management，audit，record-keeping; and
• Complying with applicable PRC laws and regulations, for example, monitoring and reporting adverse events for purposes of performing drug quality management responsibilities, providing medical information and dealing with product complaints, etc..
We will process personal information only to the extent necessary for the relevant purpose. Where required by applicable law, we will obtain your consent or separate consent before processing your personal information or sensitive personal information. Where a third-party platform or service is used in connection with a particular function, the relevant third party may process your personal information in accordance with its own privacy policy and applicable law.
III. How do we entrust, share, transfer and publicly disclose your personal information?
1. Entrustment
We may entrust our business partners with the processing of your personal information for the purpose(s) described in this Policy. We will enter into appropriate confidentiality, data processing and security agreements with such entrusted parties and require them to process personal information in accordance with our instructions , this Policy and applicable PRC laws and regulations.
2. Sharing and public disclosure
For the purpose(s) described in this Policy, we will share or publicly disclose your personal information only where permitted by applicable PRC laws and regulations and, where required, after obtaining your consent or separate consent. Such circumstances may include:
• Sharing your personal information among our affiliates and subsidiaries where necessary for legitimate business, management, compliance, or operational purposes;
• Sharing your personal information with vendors or business partners (such as conference service providers, travel service providers, data service providers, banking or insurance institutions, other professional service organizations, to the extent necessary for the relevant purpose); and
• Disclosing your personal information to the extent that it is permitted or required by applicable PRC laws and regulations or for the purpose of assisting with investigations by judicial, regulatory or law enforcement authorities.
• other circumstances permitted by applicable PRC laws and regulations.
If you submit your information through or in connection with a third-party platform or service referred to on our website, the relevant third party may independently process your personal information in accordance with its own privacy policy and applicable law.
3. Transfer
We will not transfer your personal information to any other company, entity or individual unless otherwise permitted by applicable law and, where required, after obtaining your consent. Further, in the event of a merger, acquisition, insolvency, reorganization, division, dissolution, bankruptcy, or similar transaction, we will require the new processor of your personal information to continue to be bound by this Policy or we will require the new processor to obtain your consent again.
IV.How do we provide your personal information across borders?
In principle, personal information that we collect and generate in the course of our operations within the territory of the PRC will be stored within the PRC. In certain circumstances, it may be necessary for us to provide your personal information to recipients outside the PRC in connection with our business operations, website functions, or communications, where permitted by applicable PRC laws and regulations. As required by applicable laws and regulations regarding the protection of personal information, we will provide you with the required notice and obtain your separate consent before providing your personal information across any border, unless otherwise permitted by law. We will use lawful cross-border transfer mechanisms to transfer your personal information oversea and will take necessary measures to ensure that the oversea recipients provide a level of protection required by applicable PRC laws and regulations.
You may obtain more information about cross-border transfers of personal information and oversea recipients through the contact methods referred to in this Policy.
V. How do we store your personal information?
We will retain your personal information for the minimum period necessary to achieve the purposes described in this Policy ,unless a longer retention period is required or permitted by applicable PRC laws and regulations. Upon expiration of the applicable retention period, we will promptly delete or anonymize your personal information in accordance with applicable PRC laws and regulations. Our criteria for determining the period for which personal information shall be retained include:
• Applicable laws, regulations and other relevant requirements;
• The period of time needed for us to provide services, maintain business relations or interact with you; and
• The period of time needed for us to perform relevant agreements or fulfil the purposes described in this Policy.
VI. What security measures do we take to protect your personal information?
In accordance with applicable PRC laws, regulations, and the requirements of relevant national standards, we take reasonable and appropriate security and precautionary measures to protect the personal information we process against unauthorized access, public disclosure, use, modification, destruction or loss of data. However, you are also responsible for taking appropriate measures to protect the security of the devices, systems, and networks you use when accessing our website or communicating with us.
VII. Your rights
In accordance with the requirements of the applicable PRC laws and regulations, you may have the following rights in respect of your personal information:
• To know about and make decisions regarding the processing of your personal information;
• To access or copy your personal information;
• To correct or supplement your personal information;
• To delete your personal information;
• To request for explanation of rules regarding processing of personal information; and
• To change the scope of your consent or revoke your consent , where processing is based on your consent.
If you wish to exercise your rights with respect to personal information, you may contact us through the contact information listed in this Policy and we will respond to any request in accordance with applicable relevant laws and regulations. When you exercise the above rights, we may verify your identity to safeguard the security of your personal information. Subject to applicable PRC laws and regulations, there may be circumstances where we are unable to respond to all or part of your request.
VIII. How do we process the personal information of minors?
For the purposes of this Policy and in accordance with applicable PRC laws and regulations, our products, websites and services are not targeted at minors under the age of 14. Minors under the age of 14 should not provide personal information to us without the consent of a parent or legal guardian.
If a minor's personal information is collected with the consent of a parent or legal guardian, we will process the information only when permitted by law, with the express consent of the parent or legal guardian, or necessary for the protection of the minor. If we discover that we have collected personal information without obtaining verifiable prior consent of a parent or legal guardian, we will seek to delete the data as soon as possible.
IX. Updates of the Policy
We may revise our Privacy Policy from time to time. We will post the updated version on our website and update the “Last Updated” date above or below this Policy.
Last updated: March 30, 2026.
X. How to contact us?
If you have any questions, comments or suggestions concerning this Policy, or any questions or concerns about our processing of your personal information, you may contact us in the following ways:
Address: 11/F, B8 Building, No.188 Yizhou Rd, Xuhui District, Shanghai
Tel.: 021- 33395800
Postal Code: 200233
Email: PR@178xian.com
Cookies Policy
When you visit our website, we may place small data files known as “cookies” on your device. Cookies enable our website to recognize your browser and help us understand how visitors use the site.
Cookies and similar technologies used on this website may collect online identifiers, device information, browser information, IP address, and information about how you interact with the website. In certain circumstances, such information may constitute personal information or may be associated with you under applicable PRC laws and regulations. Information collected through cookies is used for purposes such as ensuring website operation, maintaining security, analyzing traffic and performance, remembering user preferences, and improving website content and user experience.
You may choose to accept or decline cookies by adjusting your browser settings or through any cookie banner or preference center made available on our website, if applicable. Please note that disabling cookies may affect the functionality of certain parts of the website.
For more information about how we process personal information, please refer to our Privacy Notice.
Some cookies may be provided by third parties. Where third-party cookies or similar technologies are used, such third parties may process the relevant information in accordance with their own privacy policies and applicable PRC laws and regulations.
Accessibility
Shanghai Henlius Biotech, Inc. (“Henlius”) is committed to improving the accessibility and user friendliness of its website for all visitors.
We strive to ensure that the content on our website can be accessed and used by individuals with diverse needs, including those who rely on assistive technologies. As our website continues to evolve, we recognize that accessibility is an ongoing effort, and we are continuously working to improve usability and accessibility across our digital platforms.
If you experience difficulty accessing any part of our website, or have suggestions on how we can enhance accessibility, we welcome your feedback. To help us respond effectively, please include the specific webpage address (URL) and a brief description of the issue encountered.
Contact us:
Email: PR@178xian.com
(Please include “Website Accessibility” in the subject line)
Henlius will make reasonable efforts to review accessibility-related feedback and improve the overall online experience for all users. While we strive to improve accessibility, we do not guarantee that every page or feature will be fully accessible to every user in all circumstances.
Terms of Use
This website (http://www.178xian.com/) is developed and operated by Shanghai Henlius Biotech, Inc. (“Henlius”). Please read these Terms of Use carefully before accessing or using this website. By accessing, browsing or using this website, you acknowledge that you have read, understood and agreed to be bound by these Terms of Use and applicable PRC laws and regulations.
Henlius reserves the right to modify or update these Terms of Use at any time. Any updated version will be posted on this website with a revised “Last Updated” date. Please review them periodically for updates.
Prohibited Conduct:
You shall not infringe the lawful rights and interests of Henlius or any third party, nor interfere with or attempt to interfere with the normal operation, security, or integrity of this website by any means. Without limitation, you shall not use this website for any unlawful purpose, attempt unauthorized access to any part of the website or related systems, introduce malicious code, scrape or extract website content through automated means, or otherwise interfere with the website’s operation or security features.
Copyright
All content on this website, including but not limited to text, data, logos, graphics, audio, video and other materials, is owned by Henlius or its respective rights holders, unless otherwise stated. Such content is protected by applicable Chinese and international copyright laws. This website and its content may be accessed and used only for lawful, personal, and non-commercial purposes. Without prior written consent, no entity or individual may copy, reproduce, republish, upload, post, transmit, distribute, modify, create derivative works from, mirror, or otherwise use such content for commercial or public purposes.
Disclaimers
To the fullest extent permitted by applicable PRC laws and regulations, Henlius makes no warranties or representations, express or implied, regarding the content of this website, including but not limited to accuracy, completeness, timeliness or suitability for any particular purpose. Henlius does not undertake any obligation to update the content of this website , except as otherwise required by applicable PRC laws and regulations.
You use this website and any information obtained from it at your own risk. To the fullest extent permitted by applicable PRC laws and regulations, Henlius shall not be liable for any loss or damage arising from the use or inability to use this website, including but not limited to system failures, computer viruses or data loss.
Medical Information
Nothing on this website constitutes medical advice, diagnosisor treatment recommendations. Medical decisions should always be made in consultation with qualified healthcare professionals. Any product-related or disease-related information provided on this website is provided for general informational purposes only and should not be construed as medical advice, diagnosis, or treatment recommendations; any product information is subject to the approved prescribing information and applicable local laws and regulations.
Third Party Websites
This website may contain links to third party websites for convenience. Henlius is not responsible for the content, availability, privacy practices, terms or use of such third-party websites. Access to third party websites is at your own risk.
Privacy
Henlius respects your privacy. Please refer to our Privacy Notice for details.
Governing Law
These Terms of Use shall be governed by the laws of the People’s Republic of China.
Last updated: March 30, 2026
