Study to Separately Evaluate the Activity of Talacotuzumab (JNJ-56022473) or Daratumumab in Transfusion-Dependent Participants With Low or Intermediate-1 Risk Myelodysplastic Syndromes (MDS) Who Are Relapsed or Refractory to Erythropoiesis-Stimulating Agent (ESA) Treatment

This is a multicenter, randomized (study drug assigned by chance), open-label (participants and researchers are aware of the treatment participants are receiving) study to evaluate the safety and efficacy of talacotuzumab or daratumumab. Approximately 60 participants (30 to receive talacotuzumab and 30 to receive daratumumab) will be enrolled and then assigned randomly on a 1:1 basis to receive either talacotuzumab or daratumumab. The study consists of: a Screening Phase of up to 28 days during which participant eligibility will be reviewed and approved by the sponsor prior to randomization, a Treatment Phase that will extend from the first dose on Cycle 1 Day 1 until study drug discontinuation, and a Post-treatment Follow up Phase beginning once the participant discontinues talacotuzumab or daratumumab. Study drugs will continue to be administered until disease progression, lack of response, unacceptable toxicity, withdrawal of consent, or study end. Safety will be monitored throughout the study. The talacotuzumab arm of the study is closed for enrollment.