RT Journal Article SR Electronic T1 Preclinical and randomized phase I studies of plitidepsin in adults hospitalized with COVID-19 JF Life Science Alliance JO Life Sci. Alliance FD Life Science Alliance LLC SP e202101200 DO 10.26508/lsa.202101200 VO 5 IS 4 A1 Jose F Varona A1 Pedro Landete A1 Jose A Lopez-Martin A1 Vicente Estrada A1 Roger Paredes A1 Pablo Guisado-Vasco A1 Lucia Fernandez de Orueta A1 Miguel Torralba A1 Jesus Fortun A1 Roberto Vates A1 Jose Barberan A1 Bonaventura Clotet A1 Julio Ancochea A1 Daniel Carnevali A1 Noemi Cabello A1 Lourdes Porras A1 Paloma Gijon A1 Alfonso Monereo A1 Daniel Abad A1 Sonia Zuñiga A1 Isabel Sola A1 Jordi Rodon A1 Julia Vergara-Alert A1 Nuria Izquierdo-Useros A1 Salvador Fudio A1 Maria Jose Pontes A1 Beatriz de Rivas A1 Patricia Giron de Velasco A1 Antonio Nieto A1 Javier Gomez A1 Pablo Aviles A1 Rubin Lubomirov A1 Alvaro Belgrano A1 Belen Sopesen A1 Kris M White A1 Romel Rosales A1 Soner Yildiz A1 Ann-Kathrin Reuschl A1 Lucy G Thorne A1 Clare Jolly A1 Greg J Towers A1 Lorena Zuliani-Alvarez A1 Mehdi Bouhaddou A1 Kirsten Obernier A1 Briana L McGovern A1 M Luis Rodriguez A1 Luis Enjuanes A1 Jose M Fernandez-Sousa A1 Nevan J Krogan A1 Jose M Jimeno A1 Adolfo Garcia-Sastre YR 2022 UL https://www.life-science-alliance.org/content/5/4/e202101200.abstract AB Plitidepsin, a marine-derived cyclic-peptide, inhibits SARS-CoV-2 replication at nanomolar concentrations by targeting the host protein eukaryotic translation elongation factor 1A. Here, we show that plitidepsin distributes preferentially to lung over plasma, with similar potency against across several SARS-CoV-2 variants in preclinical studies. Simultaneously, in this randomized, parallel, open-label, proof-of-concept study (NCT04382066) conducted in 10 Spanish hospitals between May and November 2020, 46 adult hospitalized patients with confirmed SARS-CoV-2 infection received either 1.5 mg (n = 15), 2.0 mg (n = 16), or 2.5 mg (n = 15) plitidepsin once daily for 3 d. The primary objective was safety; viral load kinetics, mortality, need for increased respiratory support, and dose selection were secondary end points. One patient withdrew consent before starting procedures; 45 initiated treatment; one withdrew because of hypersensitivity. Two Grade 3 treatment-related adverse events were observed (hypersensitivity and diarrhea). Treatment-related adverse events affecting more than 5% of patients were nausea (42.2%), vomiting (15.6%), and diarrhea (6.7%). Mean viral load reductions from baseline were 1.35, 2.35, 3.25, and 3.85 log10 at days 4, 7, 15, and 31. Nonmechanical invasive ventilation was required in 8 of 44 evaluable patients (16.0%); six patients required intensive care support (13.6%), and three patients (6.7%) died (COVID-19-related). Plitidepsin has a favorable safety profile in patients with COVID-19.