POXEL SA (Euronext : POXEL - FR0012432516), a clinical stage biopharmaceutical company developing innovative treatments for chronic serious diseases with metabolic pathophysiology, including non-alcoholic steatohepatitis (NASH) and rare metabolic disorders, today announced that European Commission has granted orphan drug designation (ODD) for PXL770 and PXL065 for the treatment of adrenoleukodystrophy (ALD). The decision follows a positive opinion from the Committee for Orphan Medicinal Products (COMP) of the European Medicines Agency (EMA). The U.S. Food and Drug Administration has previously granted ODD and Fast Track Designation to both PXL770 and PXL065 for the treatment of ALD.

These molecules have separate and distinct mechanisms of action. PXL770 is a novel, first-in-class direct adenosine monophosphate-activated protein kinase (AMPK) activator. PXL065 is a novel, proprietary deuterium-stabilized R-stereoisomer of pioglitazone which exerts effects via multiple non-genomic pathways engaged by thiazolidinedione molecules. Both compounds are preparing to enter into Phase 2a clinical Proof-of-Concept (POC) biomarker studies in ALD patients with adrenomyeloneuropathy (AMN) as soon as possible, subject to financing.

“Orphan Drug Designation in adrenoleukodystrophy for both PXL770 and PXL065 further strengthens the value of these clinical assets where we are preparing to initiate Phase 2 proof-of-concept studies, pending additional financing”, noted Thomas Kuhn, CEO of Poxel. “We are in active discussions to restructure our current debt obligations and secure the funding to execute our strategy in rare metabolic diseases”.

Orphan Drug Designation (ODD)

ODD in the European Union (EU) is granted by the European Commission based on a positive opinion issued by the European Medicines Agency (EMA) Committee for Orphan Medical Products (COMP). To qualify for ODD from the European Commission, a product candidate must be intended to treat, prevent, or diagnose a life-threatening or chronically debilitating disease that does not affect more than 5 in 10,000 people across the EU. In addition, there must be sufficient clinical or non-clinical data to suggest the product candidate may produce clinically relevant outcomes, and grounds to indicate it can provide a significant benefit over any currently authorized products. Receiving an orphan drug designation from the European Commission provides companies with certain benefits and incentives including clinical protocol assistance, access to a centralized marketing authorization procedure valid in all EU member states, reduced regulatory fees, and ten years of market exclusivity upon receipt of marketing authorization in the EU. The availability of market exclusivity is intended to encourage the development of medicines for rare diseases by protecting them from competition from similar medicines with similar indications, which cannot be marketed during the exclusivity period.

About ALD

X-linked adrenoleukodystrophy (ALD) is an orphan neurometabolic disease caused by mutations in the ABCD1 gene which encodes for a key protein that is required for metabolism of very long chain fatty acids (VLCFA) by peroxisomes (cellular organelles). ALD is the most common leukodystrophy with a prevalence similar to hemophilia – up to 1/10,000 individuals in the general population have ALD [https://rarediseases.org]. Forms of this disease include cerebral ALD (C-ALD) and adrenomyeloneuropathy (AMN) which is the most common form – typically occurring in adolescence through adulthood. AMN is characterized by chronic and progressive distal axonopathy involving the long tracts of the spinal cord and to a lesser extent the peripheral nerves resulting in progressive stiffness and weakness in the legs, impaired gait and balance, incontinence, and loss of sensation. Nearly all men with a diagnosis of ALD will develop AMN, and many women also present with features of AMN with a later onset. C-ALD is characterized by inflammatory demyelination of cells in the brain and typically afflicts children, but many men with AMN may also develop cerebral disease; these white matter brain lesions lead to severe neurologic deficits and death. There are no approved medicines for ALD (other than glucocorticoid supplements for associated adrenal insufficiency). C-ALD when first detected in early childhood, can be treated with hematopoietic stem cell transplantation. HSCT is currently limited to early stage of C-ALD and this procedure is at risk of severe adverse reactions.

About Poxel SA

Poxel is a clinical stage biopharmaceutical company developing innovative treatments for chronic serious diseases with metabolic pathophysiology, including non-alcoholic steatohepatitis (NASH) and rare disorders. For the treatment of NASH, PXL065 (deuterium-stabilized R-pioglitazone) met its primary endpoint in a streamlined Phase 2 trial (DESTINY-1). In rare diseases, development of PXL770, a first-in-class direct adenosine monophosphate-activated protein kinase (AMPK) activator, is focused on the treatment of adrenoleukodystrophy (ALD) and autosomal dominant polycystic kidney disease (ADPKD). TWYMEEG® (Imeglimin), Poxel’s first-in-class product that targets mitochondrial dysfunction, is marketed for the treatment of type 2 diabetes in Japan by Sumitomo Pharma and Poxel expects to receive royalties and sales-based payments. Poxel has a strategic partnership with Sumitomo Pharma for Imeglimin in Japan, China, and eleven other Asian countries. Listed on Euronext Paris, Poxel is headquartered in Lyon, France, and has subsidiaries in Boston, MA, and Tokyo, Japan.

For more information, please visit: www.poxelpharma.com

All statements other than statements of historical fact included in this press release about future events are subject to (i) change without notice and (ii) factors beyond the Company’s control. These statements may include, without limitation, any statements preceded by, followed by or including words such as “target,” “believe,” “expect,” “aim,” “intend,” “may,” “anticipate,” “estimate,” “plan,” “project,” “will,” “can have,” “likely,” “should,” “would,” “could” and other words and terms of similar meaning or the negative thereof. Forward-looking statements are subject to inherent risks and uncertainties beyond the Company’s control that could cause the Company’s actual results or performance to be materially different from the expected results or performance expressed or implied by such forward-looking statements. The Company does not endorse or is not otherwise responsible for the content of external hyperlinks referred to in this press release.

Contacts - Investor relations / Media Aurélie Bozza Investor Relations & Communication Senior Director aurelie.bozza@poxelpharma.com +33 6 99 81 08 36 Elizabeth Woo Senior Vice President, Investor Relations & Communication elizabeth.woo@poxelpharma.com NewCap Emmanuel Huynh or Arthur Rouillé poxel@newcap.eu +33 1 44 71 94 94

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