Long follow-up of symptomatic Multiple Myeloma patients after Covid-19 vaccination (BNT162b2): A single-institution retrospective experience

Myeloma patients are at an increased risk of severe forms of Covid-19. We examined response to mRNA vaccine between myeloma patients (n.127) and healthy volunteers (n.50). Anti-spike IgG antibody were detected in 76.9% of evaluable patients. 23.1% of MM patients failed to respond at two doses of COVID-19 mRNA vaccine. Univariate analyses identified three independent adverse predictive factors of absence of immunological response to COVID-19 vaccine: extreme plasmacytosis (p