Highlights Lymphoproliferative disorders were associated with lower vaccine response rates than other disorders. Previous exposure to COVID-19 before vaccination was associated with higher antibody values. The duration of anti-B-lymphocyte therapy related to vaccination had an effect on response rates. The incidence of adverse effects of patients with onco-hematological diseases was similar to that of the healthy population.   ABSTRACT Objective To evaluate the influence of onco-hematological pathologies on seroconversion to COVID-19 vaccines, in addition to the effects of chemotherapy treatment […]