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Title: CMS (867.HK/8A8.SG): Innovative Drug Oral JAK1 Inhibitor Povorcitinib Has Been Included in the List of Breakthrough Therapeutic Drugs in China

China, 22nd Dec 2025 - China Medical System Holdings Limited (“CMS”, or the “Group”) is pleased to announce that its subsidiary, Dermavon Holdings Limited (“Dermavon”, an innovative pharmaceutical company specialized in skin health which is applying for an independent listing on the Main Board of The Stock Exchange of Hong Kong Limited, please refer to the announcement of the Company dated 22 April 2025 for details), has obtained the relevant licensing rights to the innovative oral JAK1 inhibitor povorcitinib (proposed English generic name: Povorcitinib Phosphate Tablets) (“povorcitinib” or the “Product”), which has been included in the list of Breakthrough Therapeutic Drugs by the Center for Drug Evaluation of the National Medical Products Administration of the People’s Republic of China (“NMPA”), with a proposed indication for adult patients with non-segmental vitiligo. This certification has the potential to accelerate the development and review process of the Product.Povorcitinib is a selective oral small-molecule JAK1 inhibitor, with compound and use patents in certain countries/regions in the Territory. Currently, povorcitinib is in Phase 3 clinical trials for non-segmental vitiligo, moderate to severe hidradenitis suppurativa (HS) and prurigo nodularis in several countries outside China. A Phase 2 clinical trial for the treatment of asthma is also ongoing.In March 2023, Incyte announced that povorcitinib met the primary endpoint in a global multi-center Phase 2b clinical trial for non-segmental vitiligo. Results showed that after 24 weeks of treatment, compared with vehicle, total body repigmentation of patients treated with povorcitinib once daily was significantly improved. Furthermore, accor...

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