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Supplemental material, sj-docx-1-taw-10.1177_20420986221146418 for Patient-centered pharmacovigilance: priority actions from the inherited bleeding disorders community by Fiona Robinson, Sonji Wilkes, Nathan Schaefer, Miriam Goldstein, Michelle Rice, Johanna Gray, Sharon Meyers and Leonard A. Valentino in Therapeutic Advances in Drug Safety

Emanuela Marchesini,1 Massimo Morfini,2 Leonard Valentino3,4 1Hemophilia Centre, SC Vascular and Emergency Department, University of Perugia, Perugia, Italy; 2Italian Association of Haemophilia Centres (AICE), Naples, Italy; 3National Hemophilia Foundation, New York, NY, USA; 4Rush University, Chicago, IL, USACorrespondence: Massimo Morfini via Dello Statuto N.1- I-50129, Firenze, ItalyTel +39 348 2306928Fax +39 055-4732 18Email drmassimomorfini@gmail.comAbstract: Progress in hemophilia therapy has been remarkable in the first 20 years of the third millennium, but the innovation began with the description the fractionation of plasma in 1946. The first concentrates followed the discovery of FVIII in the cryoprecipitate of frozen plasma and FIX in the supernatant in the early 1960s, which led to the initial attempts at replacement therapy. Unfortunately, the lack of screening methods for viral pathogens resulted in people with hemophilia (PWH) receiving concentrates contaminated by hepatitis A virus, hepatitis C virus, and human immunodeficiency virus, as these concentrates were made from large industrial pools of plasma derived from thousands of donors. Fortunately, by 1985, viral screening methods and proper virucidal techniques were developed that made concentrates safe. Increasingly pure products followed the introduction of chromatography steps with monoclonal antibodies in the production process. The problem of immunogenicity of exogenously administered concentrates has not yet had a complete solution. The development of alloantibodies against FVIII in about 25– 35% of PWH is the most serious adverse effect of replacement therapy. The next major advance followed the cloning of the F8 gene and later the F9 genes, which paved the way to produce concentrates of factors obtained by the recombinant DNA technology. The injected FVIII and FIX molecules had a relatively short circulating half-life in the plasma of people with hemophilia A and B, approximately 12 and 18 hours, respectively. The ability to prolong the plasma half-life and extend the interval between injections followed the application of methods to conjugate the factor molecule with the fragment crystallizable of IgG1 or albumin or by adding polyethylene glycol, which has led to an increase in the half-life of concentrates, especially for rFIX. The next frontier in hemophilia therapy is the application of durable and potentially curative therapies such as with gene addition therapy. Experiments in hemophilia B have demonstrated durable responses. Unfortunately, the results with gene therapy for hemophilia A have not been as remarkable and the durability must still be demonstrated. Nonetheless, the long-term safety, predictability, durability, and efficacy of gene therapy for hemophilia A and B remain an open question. At present, only healthy adult PWH have been enrolled in gene therapy clinical trials. The application of gene therapy to children and those with pre-existing antibodies against the delivery vector must also be studied before this therapy becomes widespread.Keywords: replacement therapy, adverse events, pharmacokinetics, extended half-life concentrates, non-replacement therapy, gene therapy

On 11 March 2020, the World Health Organization declared the coronavirus disease 2019 (COVID‐19) a pandemic. Recently, Hermans, et.al., outlined the challenges the COVID‐19 pandemic pose for the bleeding disorders community 1. The general response to the pandemic has included increased measures focused on personal hygiene, social distancing, symptom monitoring, early diagnosis, patient isolation, shelter in place, and public health quarantine. Accordingly, such measures have led to concerns over how to maintain access to haemophilia treatment products and to the specialized integrated care medical follow up within the haemophilia treatment centers (HTCs). As part of the medical response to disasters such as a world‐wide pandemic, telemedicine has emerged as one proposed solution to address this type of global challenge 2.