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COVID-19 antibody titers after tixagevimab-cilgavimab injection in patients with hematologic diseases; a single-center, prospective study.

Leukemia & Lymphoma 2024 April 17
Knowledge of the SARS-CoV-2 antibody titers induced by tixagevimab-cilgavimab in patients with hematologic diseases remains insufficient. Here, we performed a single-center, prospective study to reveal the changes in antibody titer after administration of tixagevimab-cilgavimab in 78 patients with hematologic diseases. The median peak titer was 155.4 U/mL, and the median AUC was 46556 days·U/mL. First, we compared several characteristics between patients with low titers (peak titer ≤ 155.4 U/mL) and high titers (peak titer > 155.4 U/mL). We extracted 6 factors (patient age, sex, ECOG-PS, serum albumin level, and cross-sectional area and computed tomographic number of the psoas major muscle) as candidates influencing the antibody titers. Multiple regression analysis revealed that antibody titer was closely associated with these 6 factors (contribution rate = 0.76, p  = 0.02). Our data support the inability of tixagevimab-cilgavimab to induce sufficient antibody titers against SARS-CoV-2, especially in older, frailer, female patients.

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