RT Journal Article T1 Frequency, Clinical Characteristics and Outcome of Adults With Acute Lymphoblastic Leukemia and COVID 19 Infection in the First vs. Second Pandemic Wave in Spain. A1 Ribera, Josep-Maria A1 Morgades, Mireia A1 Coll, Rosa A1 Barba, Pere A1 López-Lorenzo, Jose-Luis A1 Montesinos, Pau A1 Foncillas, María-Angeles A1 Cabrero, Mónica A1 Gómez-Centurión, Ignacio A1 Morales, María-Dolores A1 Varela, María-Rosario A1 Herrera, Pilar A1 García-Cadenas, Irene A1 Calbacho, María A1 Torrent, Anna A1 Maluquer, Clara A1 Calabuig, Marisa A1 Garcia-Guiñon, Antoni A1 Bautista, Guiomar A1 Llorente, Laura A1 Gil, Cristina A1 Artola, María-Teresa A1 González-Campos, José A1 Fernández-Moreno, Ainhoa A1 Bárez, Abelardo A1 Giménez-Pérez, Teresa A1 Bergua, Juan A1 Sánchez-Sánchez, María-José A1 Mateos, María-Carmen A1 Piñana, José-Luis K1 Acute lymphoblastic leukemia K1 Adults K1 Covid-19 infection K1 Outcome AB SARS-CoV-2 infection has bimodal distribution in Europe with a first wave in March to June 2020 and a second in September 2020 to February 2021. We compared the frequency, clinical characteristics and outcomes of adults with acute lymphoblastic leukemia (ALL) and infection in the first vs. second pandemic waves in Spain. In this prospective study the characteristics of ALL and COVID-19 infection, comorbidities, treatment and outcome in the two periods were compared. The study ended when vaccination against SARS-CoV-2 was implemented in Spain. Twenty eight patients were collected in the first wave and 24 in the second. The median age was 46.5 years (range 20-83). Patients from the first wave had a trend to more severe ALL (higher frequency of patients under induction or submitted to transplantation or under immunosuppressive therapy). No significant differences were observed in need for oxygen support, intensive care unit (ICU) requirement, days in ICU and time to COVID-19 infection recovery. Seventeen patients (33%) died, with death attributed to COVID infection in 15 (29%), without significant differences in the 100 day overall survival (OS) probabilities in the two waves (68% ± 17% vs. 56% ± 30%). The only prognostic factor for OS identified by was the presence of comorbidities at COVID-19 infection (HR: 5.358 [95% CI: 1.875- 15.313]). The frequency and mortality of COVID-19 infection were high in adults with ALL, without changes over time, providing evidence in favor of vaccination priority for these patients. YR 2021 FD 2021-07-18 LK https://hdl.handle.net/10668/25347 UL https://hdl.handle.net/10668/25347 LA en DS RISalud RD Apr 17, 2025