Patient(15) COVID-19(13) leukemia(11) Hematological malignancy(8) SARS-CoV-2(7) lymphoma(7) Infection(7) hematological(7) were recorded(6) treated(6) administration(6) baseline(6) therapy(6) monoclonal antibody(5) CLL(5) antibody(5) Mortality(5) chronic lymphocytic leukemia(5) impair(4) patients(4) neutralizing monoclonal antibody(4) COVID-19 mortality(4) Cohort(4) first COVID-19 symptom(4) death(4) leukemias(4) significantly(4) Follow-up(4) median(4) Critical(4)