As previously announced, the acquisition of
In
Financial considerations
Upon completion of the acquisition, GSK acquired all outstanding shares of
About myelofibrosis
Myelofibrosis is a rare blood cancer that results from dysregulated JAK-STAT signalling and is characterised by constitutional symptoms, splenomegaly (enlarged spleen) and progressive anaemia. From prior studies with momelotinib, we know approximately half of myelofibrosis patients are moderately to severely anaemic when eligible for JAK inhibitor treatment. Furthermore, currently approved JAK inhibitors only address symptoms and splenomegaly and are myelosuppressive. This can lead to worsening anaemia, resulting in dose reductions that potentially reduce treatment effect.
Myelofibrosis affects approximately 20,000 patients in the US, with approximately 40% of patients already anaemic at time of diagnosis and nearly all patients estimated to eventually develop anaemia.[1],[2] Patients treated with the most commonly used JAK inhibitor will often require transfusions, and more than 30% will discontinue treatment due to anaemia.[3] Anaemia and transfusion dependence are strongly correlated with poor prognosis and shortened survival.[4]
About momelotinib
Momelotinib has a differentiated mode of action with inhibitory ability along three key signalling pathways: activin A receptor, type I (ACVR1)/activin receptor-like kinase-2 (ALK2), Janus kinase (JAK) 1, and JAK2. This activity may lead to beneficial treatment effects on anaemia and reduce transfusion dependence while treating myelofibrosis symptoms and splenic response.
GSK in oncology
GSK is focused on maximising patient survival through transformational medicines. GSK's pipeline is focused on immuno-oncology, cell therapy, tumor cell targeting therapies and synthetic lethality. Our goal is to achieve a sustainable flow of new treatments based on a diversified portfolio of investigational medicines utilising modalities such as small molecules, antibodies, antibody-drug conjugates and cell therapy, either alone or in combination.
About GSK
GSK is a science-led global healthcare company. For further information please visit www.gsk.com/about-us.
Cautionary statement regarding forward-looking statements
GSK cautions investors that any forward-looking statements or projections made by GSK, including those made in this announcement, are subject to risks and uncertainties that may cause actual results to differ materially from those projected. Such factors include, but are not limited to, those described in the Company's Annual Report on Form 20-F for 2021, GSK's Q1 Results for 2022 and any impacts of the COVID-19 pandemic.
References
[1] Naymagon, L., & Mascarenhas, J. (2017). Myelofibrosis-Related Anemia: Current and Emerging Therapeutic Strategies. HemaSphere, 1(1), e1. https://doi.org/10.1097/HS9.0000000000000001
[2] Chifotides, H.T., Bose, P. & Verstovsek, S. Momelotinib: an emerging treatment for myelofibrosis patients with anemia. J Hematol Oncol 15, 7 (2022). https://doi.org/10.1186/s13045-021-01157-4
[3] Palandri, F., Palumbo, G.A., Elli, E.M. et al. Ruxolitinib discontinuation syndrome: incidence, risk factors, and management in 251 patients with myelofibrosis. Blood Cancer J. 11, 4 (2021). https://doi.org/10.1038/s41408-020-00392-1
[4] Pardanani, A., & Tefferi, A. (2011). Prognostic relevance of anemia and transfusion dependency in myelodysplastic syndromes and primary myelofibrosis. Haematologica, 96(1), 8-10. https://doi.org/10.3324/haematol.2010.035519
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