11β-HSD

October 1, 2024 – Santhera Pharmaceuticals (SIX: SANN) announces the positive outcome of the LIONHEART study, confirming vamorolone’s distinctive action also as a mineralocorticoid receptor antagonist, setting it apart from other corticosteroids. The LIONHEART study, an open-label randomized, placebo- and eplerenone-controlled study involving 30 healthy adult male subjects, met its primary endpoint. It demonstrated a statistically significant increase in the urinary sodium/potassium ratio in the vamorolone arm compared to placebo (p<0.0001) following a fludrocortisone challenge. This increased ratio in urine provides clinical evidence for vamorolone’s unique mode of action also as a mineralocorticoid receptor antagonist (MRA) in humans. Combined with its known properties as a dissociative glucocorticoid receptor agonist, these findings further differentiate vamorolone’s pharmacological profile, distinguishing it from other corticosteroids. Cardiac complications such as cardiomyopathy are a leading cause of morbidity and mortality in boys with Duchenne muscular dystrophy (DMD). While treatment with corticosteroids (and ACE inhibitors) has demonstrated a delay in the onset of cardiomyopathy, the addition of MRAs including eplerenone to standard of care has also shown an improvement in left ventricular systolic dysfunction, the benefit of which increases with earlier initiation [1-3]. “Mineralocorticoid receptor antagonists are strongly recommended but late when cardiac function is already reduced and tend to be used in the presence of myocardial fibrosis as detected in magnetic resonance imaging,” explained Prof Karim Wahbi, PhD, MD, Cardiologist at the APHP Hospital Cochin, Paris, France. “What is intriguing about this mechanistic study is whether there is a synergistic benefit of the anti-inflammatory and MRA effects of vamorolone on the evolution of cardiac disease in children who started treatment early or if vamorolone could be of benefit to those who are already experiencing cardiac symptoms and wish to remain on a corticosteroid” “The LIONHEART study is an important milestone to establish the proof of concept for a cardioprotective potential of vamorolone,” stated Shabir Hasham, MD, Chief Medical Officer of Santhera. “We continue to collect data from patients who have been on vamorolone for up to seven years allowing us to better characterize long-term outcomes including any beneficial impact on cardiac complications in DMD.” AGAMREE is a novel drug with a mode of action based on binding to the same receptor as glucocorticoids but modifying its downstream activity. Moreover, it is not a substrate for the 11-β-hydroxysteroid dehydrogenase (11β-HSD) enzymes that may be responsible for local drug amplification and corticosteroid-associated toxicity in local tissues [4-7]. This mechanism has shown the potential to ‘dissociate’ efficacy from steroid safety concerns and therefore AGAMREE is positioned as a dissociative anti-inflammatory drug and an alternative to existing corticosteroids, the current standard of care in children and adolescent patients with DMD [4-7]. In the pivotal VISION-DMD study, AGAMREE met the primary endpoint Time to Stand (TTSTAND) velocity versus placebo (p=0.002) at 24 weeks of treatment and showed a good safety and tolerability profile [4]. The most commonly reported side effects were cushingoid features, vomiting, weight increase and irritability. Side effects were generally of mild to moderate severity. Currently available data show that AGAMREE, unlike corticosteroids, has been shown to be a dual mineralocorticoid antagonist and a dissociative glucocorticoid agonist based on animal experiments [7]. It has no restriction of growth [8] and no negative effects on bone metabolism as demonstrated by normal bone formation and bone resorption serum markers [9]. AGAMREE (vamorolone), an orphan medicinal product, is approved for use in the United States (Prescribing Information), the European Union (Summary of Product Characteristics) and the United Kingdom for the treatment of DMD. The LIONHEART study (SNT-I-VAM-026) is an open label randomized, 3-arm, parallel-group, placebo and eplerenone controlled study to evaluate the mineralocorticoid receptor antagonism (MRA) effect of vamorolone in 30 healthy adult male subjects after challenge with fludrocortisone, a known mineralocorticoid receptor agonist. The primary endpoint was defined as the ratio of sodium to potassium (Na/K) and the corresponding logarithm of the ratio (log10(10*Na/K) in urine at different time-points. Further analysis of the data is ongoing and will be presented at medical conferences. References: [1] Birnkrant et al. (2018) Lancet Neurol. 2018 Apr;17(4):347-361. doi: 10.1016/S1474-4422(18)30025-5. [2] Raman et a. (2015) Lancet Neurol 14: 153–161 doi:10.1016/s1474-4422(14)70318-7 [3] Raman et al. (2017) Orphanet J Rare Dis 12: 39. doi:10.1186/s13023-017-0590-8 [4] Dang UJ et al. (2024) Neurology 2024;102:e208112. doi.org/10.1212/WNL.0000000000208112. Link. [5] Guglieri M et al (2022). JAMA Neurol. 2022;79(10):1005-1014. doi:10.1001/jamaneurol.2022.2480. Link. [6] Liu X et al (2020). Proc Natl Acad Sci USA 117:24285-24293 [7] Heier CR et al (2019). Life Science Alliance DOI: 10.26508 [8] Ward et al., WMS 2022, FP.27 - Poster 71. Link. [9] Hasham et al., MDA 2022 Poster presentation. Link. Duchenne muscular dystrophy (DMD) is a rare inherited X-chromosome-linked disease, which almost exclusively affects males. DMD is characterized by inflammation which is present at birth or shortly thereafter. Inflammation leads to fibrosis of muscle and is clinically manifested by progressive muscle degeneration and weakness. Major milestones in the disease are the loss of ambulation, the loss of self-feeding, the start of assisted ventilation, and the development of cardiomyopathy. DMD reduces life expectancy to before the fourth decade due to respiratory and/or cardiac failure. Corticosteroids are the current standard of care for the treatment of DMD. Santhera Pharmaceuticals (SIX: SANN) is a Swiss specialty pharmaceutical company focused on the development and commercialization of innovative medicines for rare neuromuscular diseases with high unmet medical need. The Company has an exclusive license from ReveraGen for all indications worldwide to AGAMREE® (vamorolone), a dissociative steroid with novel mode of action, which was investigated in a pivotal study in patients with Duchenne muscular dystrophy (DMD) as an alternative to standard corticosteroids. AGAMREE for the treatment of DMD is approved in the U.S. by the Food and Drug Administration (FDA), in the EU by the European Medicines Agency (EMA), and in the UK by the Medicines and Healthcare products Regulatory Agency (MHRA). Santhera has out-licensed rights to AGAMREE for North America to Catalyst Pharmaceuticals and for China to Sperogenix Therapeutics. For further information, please visit www.santhera.com. The content above comes from the network. if any infringement, please contact us to modify.

Pratteln, Switzerland, September 24, 2024 – Santhera Pharmaceuticals (SIX: SANN) announces that Swissmedic, the Swiss Agency for Therapeutic Products, has accepted for review the marketing authorization application (MAA) for AGAMREE® (vamorolone) for the treatment of Duchenne muscular dystrophy (DMD). Santhera asked Swissmedic to assess AGAMREE® as part of Article 13 TPA (therapeutics product act) procedure, allowing it to consider the results of foreign regulatory authorities’ assessments when reviewing a medicinal product for authorization in Switzerland. In the case of AGAMREE, Swissmedic will consider the EU approval of the drug received in December 2023. This can streamline the approval process by leveraging existing evaluations from countries with comparable regulatory standards. The outcome of the Swissmedic review is expected in late H1-2026 with the possibility to be accelerated to early 2026 if the Article 13 is accepted. Swissmedic approval in addition to EMA/FDA/MHRA approvals will leverage the access for this orphan drug to other markets through an abbreviated review. “Submission of AGAMREE for DMD to Swissmedic is an important milestone, following approvals from the U.S. FDA, the European Commission in the EU, and the UK MHRA, in addition to acceptance for priority review from China’s NMPA,” commented Shabir Hasham, MD, Chief Medical Officer of Santhera. “We look forward to working closely with Swissmedic to address the high unmet need for improved treatment options for patients suffering from DMD in Switzerland.” About AGAMREE® (vamorolone) AGAMREE is a novel drug with a mode of action based on binding to the same receptor as glucocorticoids but modifying its downstream activity. Moreover, it is not a substrate for the 11-β-hydroxysteroid dehydrogenase (11β-HSD) enzymes that may be responsible for local drug amplification and corticosteroid-associated toxicity in local tissues [1-4]. This mechanism has shown the potential to ‘dissociate’ efficacy from steroid safety concerns and therefore AGAMREE is positioned as a dissociative anti-inflammatory drug and an alternative to existing corticosteroids, the current standard of care in children and adolescent patients with DMD [1-4]. In the pivotal VISION-DMD study, AGAMREE met the primary endpoint Time to Stand (TTSTAND) velocity versus placebo (p=0.002) at 24 weeks of treatment and showed a good safety and tolerability profile [1, 4]. The most commonly reported side effects were cushingoid features, vomiting, weight increase and irritability. Side effects were generally of mild to moderate severity. Currently available data show that AGAMREE, unlike corticosteroids, has no restriction of growth [5] and no negative effects on bone metabolism as demonstrated by normal bone formation and bone resorption serum markers [6].AGAMREE (vamorolone), an orphan medicinal product, is approved for use in the United States (Prescribing Information), the European Union (Summary of Product Characteristics) and the United Kingdom. References:[1] Dang UJ et al. (2024) Neurology 2024;102:e208112. doi.org/10.1212/WNL.0000000000208112. Link.[2] Guglieri M et al (2022). JAMA Neurol. 2022;79(10):1005-1014. doi:10.1001/jamaneurol.2022.2480. Link.[3] Liu X et al (2020). Proc Natl Acad Sci USA 117:24285-24293[4] Heier CR et al (2019). Life Science Alliance DOI: 10.26508[5] Ward et al., WMS 2022, FP.27 - Poster 71. Link.[6] Hasham et al., MDA 2022 Poster presentation. Link. About Duchenne Muscular DystrophyDuchenne muscular dystrophy (DMD) is a rare inherited X-chromosome-linked disease, which almost exclusively affects males. DMD is characterized by inflammation which is present at birth or shortly thereafter. Inflammation leads to fibrosis of muscle and is clinically manifested by progressive muscle degeneration and weakness. Major milestones in the disease are the loss of ambulation, the loss of self-feeding, the start of assisted ventilation, and the development of cardiomyopathy. DMD reduces life expectancy to before the fourth decade due to respiratory and/or cardiac failure. Corticosteroids are the current standard of care for the treatment of DMD. About SantheraSanthera Pharmaceuticals (SIX: SANN) is a Swiss specialty pharmaceutical company focused on the development and commercialization of innovative medicines for rare neuromuscular diseases with high unmet medical need. The Company has an exclusive license from ReveraGen for all indications worldwide to AGAMREE® (vamorolone), a dissociative steroid with novel mode of action, which was investigated in a pivotal study in patients with Duchenne muscular dystrophy (DMD) as an alternative to standard corticosteroids. AGAMREE for the treatment of DMD is approved in the U.S. by the Food and Drug Administration (FDA), in the EU by the European Medicines Agency (EMA), and in the UK by the Medicines and Healthcare products Regulatory Agency (MHRA). Santhera has out-licensed rights to AGAMREE for North America to Catalyst Pharmaceuticals and for China to Sperogenix Therapeutics. For further information, please visit www.santhera.com. AGAMREE® is a trademark of Santhera Pharmaceuticals. For further information please contact: public-relations@santhera.com orEva Kalias, Head Investor Relations & CommunicationsPhone: +41 79 875 27 80eva.kalias@santhera.com Disclaimer / Forward-looking statements This communication does not constitute an offer or invitation to subscribe for or purchase any securities of Santhera Pharmaceuticals Holding AG. This publication may contain certain forward-looking statements concerning the Company and its business. Such statements involve certain risks, uncertainties and other factors which could cause the actual results, financial condition, performance or achievements of the Company to be materially different from those expressed or implied by such statements. Readers should therefore not place undue reliance on these statements, particularly not in connection with any contract or investment decision. The Company disclaims any obligation to update these forward-looking statements. # # # Attachment 2024 09 24_SwissmedicMAA_e_finalx

Pratteln, Switzerland, September 10, 2024 – Santhera Pharmaceuticals (SIX: SANN) announces the signing of an exclusive distribution agreement with GENESIS Pharma for AGAMREE® (vamorolone) for the treatment of Duchenne muscular dystrophy (DMD) in 20 markets in Central and Eastern Europe. Santhera Pharmaceuticals and GENESIS Pharma have signed a distribution agreement for 20 markets in Central and Eastern Europe. This strategic collaboration aims to address unmet medical needs by allowing GENESIS Pharma to commercialize AGAMREE in Greece, Cyprus, Malta, Romania, Bulgaria, Slovenia, Croatia, Poland, Czech Republic, Hungary, Slovakia, Lithuania, Latvia, Estonia, Serbia, North Macedonia, Bosnia & Herzegovina, Montenegro, Albania, and Kosovo. “This distribution agreement with GENESIS Pharma marks a significant achievement for Santhera as we expand the global availability of AGAMREE. By partnering with expert organizations with a strong understanding of specialist markets, we ensure optimal patient access,” said Geert Jan van Daal, MD, PhD, Chief Commercial Officer of Santhera. “This is a further step in our strategy to allow focus on key European markets with dedicated Santhera teams while partnering with the best companies for non-core European markets.” Constantinos Evripides, Managing Director of GENESIS Pharma, stated: “Our company has a strong focus on rare diseases and an established expertise of more than twenty years in the commercialization of orphan therapies. We are delighted that Santhera has trusted our capabilities across the CEE region, giving us the opportunity to add Vamorolone to our broad and robust orphans’ portfolio. We will work closely and diligently with Santhera to ensure a smooth and unhindered access to all patients that can benefit from this innovative treatment.” The European Commission approved AGAMREE for the treatment of DMD, in patients 4 years of age and older, in December 2023. This was based on data from the positive pivotal DMD study and three open-label studies. Patients treated with AGAMREE or placebo showed normal and similar growth while growth stunting was observed in children treated with prednisone. In addition, patients who switched from a standard of care corticosteroid to AGAMREE maintained the efficacy benefit while recovering their growth and bone health. About AGAMREE® (vamorolone) AGAMREE is a novel drug with a mode of action based on binding to the same receptor as glucocorticoids but modifying its downstream activity. Moreover, it is not a substrate for the 11-β-hydroxysteroid dehydrogenase (11β-HSD) enzymes that may be responsible for local drug amplification and corticosteroid-associated toxicity in local tissues [1-4]. This mechanism has shown the potential to ‘dissociate’ efficacy from steroid safety concerns and therefore AGAMREE is positioned as a dissociative anti-inflammatory drug and an alternative to existing corticosteroids, the current standard of care in children and adolescent patients with DMD [1-4]. In the pivotal VISION-DMD study, AGAMREE met the primary endpoint Time to Stand (TTSTAND) velocity versus placebo (p=0.002) at 24 weeks of treatment and showed a good safety and tolerability profile [1, 4]. The most commonly reported side effects were cushingoid features, vomiting, weight increase and irritability. Side effects were generally of mild to moderate severity. Currently available data show that AGAMREE, unlike corticosteroids, has no restriction of growth [5] and no negative effects on bone metabolism as demonstrated by normal bone formation and bone resorption serum markers [6]. AGAMREE (vamorolone), an orphan medicinal product, is approved for use in the United States (Prescribing Information), the European Union (Summary of Product Characteristics) and the United Kingdom. References:[1] Dang UJ et al. (2024) Neurology 2024;102:e208112. doi.org/10.1212/WNL.0000000000208112. Link.[2] Guglieri M et al (2022). JAMA Neurol. 2022;79(10):1005-1014. doi:10.1001/jamaneurol.2022.2480. Link.[3] Liu X et al (2020). Proc Natl Acad Sci USA 117:24285-24293[4] Heier CR et al (2019). Life Science Alliance DOI: 10.26508[5] Ward et al., WMS 2022, FP.27 - Poster 71. Link.[6] Hasham et al., MDA 2022 Poster presentation. Link. About Duchenne Muscular Dystrophy Duchenne muscular dystrophy (DMD) is a rare inherited X-chromosome-linked disease, which almost exclusively affects males. DMD is characterized by inflammation which is present at birth or shortly thereafter. Inflammation leads to fibrosis of muscle and is clinically manifested by progressive muscle degeneration and weakness. Major milestones in the disease are the loss of ambulation, the loss of self-feeding, the start of assisted ventilation, and the development of cardiomyopathy. DMD reduces life expectancy to before the fourth decade due to respiratory and/or cardiac failure. Corticosteroids are the current standard of care for the treatment of DMD. About SantheraSanthera Pharmaceuticals (SIX: SANN) is a Swiss specialty pharmaceutical company focused on the development and commercialization of innovative medicines for rare neuromuscular and pulmonary diseases with high unmet medical need. The Company has an exclusive license from ReveraGen for all indications worldwide to AGAMREE® (vamorolone), a dissociative steroid with novel mode of action, which was investigated in a pivotal study in patients with Duchenne muscular dystrophy (DMD) as an alternative to standard corticosteroids. AGAMREE for the treatment of DMD is approved in the U.S. by the Food and Drug Administration (FDA), in the EU by the European Medicines Agency (EMA), and in the UK by the Medicines and Healthcare products Regulatory Agency (MHRA). Santhera has out-licensed rights to vamorolone for North America to Catalyst Pharmaceuticals and for China to Sperogenix Therapeutics. For further information, please visit www.santhera.com. AGAMREE® is a trademark of Santhera Pharmaceuticals. About GENESIS PharmaGENESIS Pharma is a regional biopharma company focused on the commercialization of innovative biopharmaceutical products targeting severe and rare diseases in Central and Eastern Europe. Established in 1997, GENESIS Pharma was among the first pharmaceutical companies in Europe to specialize in the marketing, sales and distribution of biopharmaceutical products. GENESIS Pharma maintains a strong portfolio in therapeutic areas with high unmet medical need through long standing strategic alliances with some of the leading global biopharma companies. For more information, please visit www.genesispharmagroup.com. For further information please contact: public-relations@santhera.com orEva Kalias, Head Investor Relations & CommunicationsPhone: +41 79 875 27 80eva.kalias@santhera.com For more information about GENESIS Pharma, please contact:Natalia Karahaliou, Communications Manager nkarahaliou@genesispharma.comPhone: +30 210 87 71 605 Disclaimer / Forward-looking statements This communication does not constitute an offer or invitation to subscribe for or purchase any securities of Santhera Pharmaceuticals Holding AG. This publication may contain certain forward-looking statements concerning the Company and its business. Such statements involve certain risks, uncertainties and other factors which could cause the actual results, financial condition, performance or achievements of the Company to be materially different from those expressed or implied by such statements. Readers should therefore not place undue reliance on these statements, particularly not in connection with any contract or investment decision. The Company disclaims any obligation to update these forward-looking statements. # # # Attachment 2024 09 10_Partnering Genesis_e_final