Patients will receive the recommended phase II dose of XmAb23104 monotherapy on day 1 and 15 of each 28-day cycle. Patients will continue XmAb23104 (day 1 & 15, q 28 days) for up to 24 months depending on their response and tolerability to treatment. Treatment will be continued until progressive disease (PD) or toxicity or a total of 24 months of study therapy has been completed.
XmAb23104 (10 mg/kg) intravenously on days 1 and 15 of each 28-day cycle. XmAb23104 will be administered by IV infusion at a constant rate over 1 hour.
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