Adults with blood cancers respond to booster, not initial dose of COVID 19 vaccine

People with hematologic malignancies-or blood cancers including leukemia, lymphoma, and multiple myeloma-have an impaired immune system due to their disease and its treatment, putting them at risk of severe COVID-19 infection and experiencing a reduced response to COVID-19 vaccination.

In a recent study published by Wiley online in CANCER, a peer-reviewed journal of the American Cancer Society, less than half of patients with hematologic malignancies mounted detectable antibodies after initial COVID-19 vaccination, but 56% of "nonresponders" produced antibodies after receiving a booster dose.

For the study, Thomas Ollila, MD, of Brown University, and his colleagues retrospectively analyzed antibody responses to initial and booster COVID-19 vaccination in 378 patients with hematologic malignancies.

Anti-SARS-CoV-2 antibodies were detected in the blood of 181 patients (48%) after initial vaccination with one of three U.S. Food and Drug Administration (FDA)-authorized or approved COVID-19 vaccines, and patients with active cancer or those recently treated with an immune cell–depleting therapy were least likely to produce these antibodies. Among patients who did not mount an antibody response following initial vaccination, responses were observed after a booster dose in 48 of 85 (56%) patients who were assessed.