ELSALYS BIOTECH acquires from JAZZ PHARMACEUTICALS the worldwide rights of LEUKOTAC®, an immunotherapy antibody with clinical benefits in steroid-resistant acute Graft-versus-Host Disease

- In a recent clinical study, it has shown a - favorable risk/benefit profile, supporting the experience already obtained with LEUKOTAC® in nearly 1,200 patients with acute graft-versus-host disease (aGvHD).
- Developed to date by JAZZ PHARMACEUTICALS, LEUKOTAC® has received an orphan designation in Europe and the United States.
- ELSALYS BIOTECH has initiated discussion with the European health authorities (EMA) and will engage in regulatory interactions with the FDA in 2018.


ELSALYS BIOTECH, a new player in immuno-oncology, has acquired from JAZZ PHARMACEUTICALS the development and commercialization rights of LEUKOTAC® (inolimomab), a monoclonal antibody that has recently demonstrated its clinical superiority in the treatment of Steroid-Resistant acute Graft-versus-Host Disease (steroid-resistant aGvHD), an orphan disease with very poor prognosis.
GvHD is the main complication of hematopoietic stem cell transplantation, the last treatment option for patients with certain blood cancers and severe immunodeficiency. To date, clinicians have no reliable means to predict the occurrence of GvHD and even less its steroid-resistant form. No treatment has yet obtained marketing authorization in this indication and each year steroid-resistant aGvHD causes almost 4,000 deaths in Europe[1].

LEUKOTAC® (inolimomab) is an immunotherapy monoclonal antibody against the IL-2 receptor that blocks the action of T-cells responsible for aGvHD. It was already administrated to nearly 1,200 children and adults with aGvHD, mostly with steroid-resistant aGvHD, whether in clinical trials or for compassionate use. Based on additional analyses of a recent pivotal Phase 3 study conducted in 100 patients with severe with steroid-resistant aGvHD (77% of patients diagnosed grade 3 or 4), LEUKOTAC® has demonstrated very promising results both in terms of efficacy (37% reduction in the risk of death, p=0.055 1-sided and reduction of primary composite endpoint of death at one year without change in treatment 28%, p=0.095 1-sided) and tolerability (significant reduction in adverse events, in particular infectious). All these results were obtained in comparison with a control group receiving anti-thymoglobulin immunosuppressant.
ELSALYS BIOTECH is now in discussion with the European Medicines Agency (EMA) in order to assess the terms of registration at the earliest opportunity. At the same time, to allow physicians and patients to gain access as quickly as possible to LEUKOTAC®, ELSALYS BIOTECH is currently preparing requests for compassionate use authorization of the drug for patients with severe steroid-resistant aGvHD with the different national health authorities (Named Patient Basis or cohort Temporary Authorization for Use[2] evaluated in France by the ANSM, the National Agency for Medicines and health products Safety). Discussions with the US Food and Drug Administration (FDA) are expected to start as early as 2018.


LEUKOTAC® could be the first product registered in Europe
in this orphan indication in both adults and children


“Nearly 50% of patients with aGvHD rapidly develop resistance to steroids, the reference first-line treatment, and to date clinicians have no approved standard treatment [3] for patients for whom therapy is no longer an option” says Dr David LIENS, Chief Medical Officer, ELSALYS BIOTECH “The additional analyses from the recent Phase 3 trial conducted in the same patients shown that our novel antibody, that specifically blocks one of the main immune receptors implicated in aGvHD, could be the first product registered in Europe in this orphan indication in both adults and children.” 

 “Above all, we are very proud to offer a first potential therapeutic option to transplant patients with steroid-resistant aGvHD. Today these patients are indeed victims of a “double punishment” since after having overcome a serious blood disorder with the help of bone marrow transplantation, they have another life-threatening disease, this time linked to the transplant” highlights Dr. Christine GUILLEN, CEO and Co-founder, ELSALYS BIOTECH “Clearly it is also a major step for our company as it validates our strategy based on validated innovative targets and niche markets on which our antibodies are able to make a difference. Consequently, five years after its creation, ELSALYS BIOTECH could be one of the first French biopharmaceutical companies to enter the main segment of the oncology market: immunotherapy.”


[1] Center for International Blood and Marrow Transplant Research 2016 report.

[2] Temporary Use Autorization cohort in France (ATUc), or compassionate use authorization in the other European countries, provides early access to medicinal products that have not been granted marketing authorization.

[3] First & second-line systemic treatment of Acute Graft-versus-host Disease: Recommendations of the American Society of Blood and Marrow Transplantation, PJ Martin et al, Biol Blood Marrow TR, 2012 Aug;18(8):1150-63; DOI: 10.1016/j.bbmt.2012.04.005