Learn about rare disease The information hub where you can find out about the rare diseases Alexion researches and treats.

Rare disease can be complicated, and receiving a diagnosis is not always a straightforward process. If you or a loved one are undergoing diagnosis or treatment for a rare disease, you are not alone; and we recognise the importance of having accurate and reliable information to guide you through your treatment journey.

Unify Rare (an Alexion platform) is intended to educate and support patients by providing information about their rare disease. Please consult your doctor, nurse or pharmacist for further support.

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Generalised myasthenia gravis (gMG)
Myasthenia gravis (MG) is caused by a disruption in the way the nerves and muscles communicate. It is characterised by varying muscle weakness and fatigue.1–3

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Neuromyelitis optica spectrum disorder (NMOSD)
NMOSD is a rare disorder characterised by unpredictable, intermittent episodes of vision impairment and mobility limitation.4,5 It is a consequence of the body mistakenly attacking healthy cells in the central nervous system (CNS).4,6
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Neurofibromatosis type 1 (NF1)
NF1 is a rare genetic condition that causes tumours (usually benign), known as neurofibromas, to grow along nerves.7,8 These can result in a range of symptoms, including brown patches on the skin, clusters of freckles and problems with bones, eyes and the nervous system.7 The condition progresses over time from childhood.8
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Atypical haemolytic uraemic syndrome (aHUS)
aHUS is a rare and serious disease that affects both adults and children.9-11 aHUS is a condition caused when the complement system, which is part of the body’s immune system, becomes overactive.
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Lysosomal acid lipase deficiency(LAL-D)
Lysosomal acid lipase deficiency (LAL-D) is a rare, progressive and inherited condition caused by mutations in the LIPA gene which is responsible for the production of the lysosomal acid lipase (LAL) enzyme.12 LAL-D is characterised by problems with the breakdown and use of fats and cholesterol in the body.
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Gilhus NE, et al. Myasthenia gravis. Nat Rev Dis Primers. 2019;5(1):30. Melzer N, et al. Clinical features, pathogenesis, and treatment of myasthenia gravis: A supplement to the guidelines of the German neurological society. J Neurol. 2016;263(8):1473–1494. Myasthenia Gravis. National Institute of Neurological Disorders and Stroke. Available at: https://www.ninds.nih.gov/health-information/disorders/myasthenia-gravis. Last accessed: May 2023. Wingerchuk DM, Lucchinetti CF. Neuromyelitis optica spectrum disorder. N Engl J Med. 2022;387(7):631–639. Holroyd KB, et al. Update on neuromyelitis optica spectrum disorder. Curr Opin Ophthalmol. 2020;31(6):462–468. Neuromyelitis Optica. National Institute of Neurological Disorders and Stroke. Available at: https://www.ninds.nih.gov/health-information/disorders/neuromyelitis-optica. Last accessed: May 2023. NHS. Overview. Neurofibromatosis type 1. Available at: https://www.nhs.uk/conditions/neurofibromatosis-type-1. Last accessed July 2023. Tamura R. Current understanding of neurofibromatosis type 1, 2, and schwannomatosis. Int J Mol Sci 2021;22(11):5850 Raina R, Vijayvargiya N, Khooblall A, et al. Cells. 2021;10:3580. Yerigeri K, Kadatane S, Mongan K, et al. J Multidiscip Healthc. 2023;16:2233–49. Avila Bernabeu AI, Cavero Escribano T, Cao Vilarino M. Nephron. 2020;144:537–49. Reiner Ž, Guardamagna O, Nair D, et al. Lysosomal acid lipase deficiency — an under-recognized cause of dyslipidaemia and liver dysfunction. Atherosclerosis. 2014;235(1):21-30.