Clinical efficacy of pneumococcal vaccination in multiple myeloma patients on novel agents: Results of a prospective clinical study.

Among the high risk groups, patients with multiple myeloma (MM) have one of the highest incidence of invasive pneumococcal disease, mainly pneumonias. Recent changes in MM treatment have now led to an increase of survival, while the infection-related mortality remains high. The question of efficacy of pneumococcal vaccination in patients receiving novel target agents has not been clinically investigated before. We have introduced the 3-dose vaccination regimen by 13-valent pneumococcal conjugate (PCV13) vaccine between the treatment courses with novel target agents (bortezomib, lenalidomide, ixazomib) with a minimum of 1 month interval. The incidence of pneumonias during the one-year observation period was taken as a primary outcome in this registered clinical trial. From 2017 to 2020, we have prospectively included 18 adult patients who were vaccinated by PCV13 along with 18 patients of a control matched group. No adverse effects of vaccination were registered in the study. We have observed an independent effect of PCV13 vaccination on the incidence of pneumonias. The absolute risk reduction of pneumonias in patients received PCV13 vaccination was 33.3%. Number needed to treat for PCV13 vaccination in multiple myeloma patients receiving novel agents was 3.0; (95% CI 1.61-22.1; p = 0.0571). Therefore, we have shown the clinical effectiveness of PCV13 vaccination schedule based on 3 doses given with a minimum 1 month interval between the courses of novel agents in multiple myeloma patients, despite the expected decrease in immunological response to vaccination during target and immunotherapy. ClinicalTrials.gov Identifier: NCT03619252.

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Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.