IV 0.15 mg/kg infusion over 30 min every 3 wk for 2 cycles. 0.075 mg/kg infusion over 30 min every 3 wk for subsequent cycles. Premed: Administer dexamethasone 4 mg PO or IV bd for 3 days beginning the day before Zynlonta administration. If dexamethasone does not begin the day before Zynlonta, administer dexamethasone at least 2 hr prior to Zynlonta.