- Have received a single B cell targeting agent within 3 months prior to first study agent administration; or received more than 1 previous B cell targeting therapy including belimumab or epratuzamab within 6 months prior to first administration of the study agent; or received B cell depleting therapy (eg, rituximab) within 12 months prior to first administration of the study agent or have evidence of continued B-cell depletion following such therapy