<qa>  What is a substance that looks like the study drug?If you are found to be eligible to take part in this study, you will be randomly assigned as in the toss of a coin to one of four treatment groups. These 4 groups will also be split into 2 separate subgroups Arm A and Arm B. Participants in Arm A will either receive AMG 531 or placebo on Day -5 5 days before chemotherapy starts and Day 5 5 days after chemotherapy starts. A placebo is a substance that looks like the study drug but which has no active ingredients. Every 2 out of 3 participants in Arm A will receive AMG 531. One out of every 3 participants in Arm A will receive placebo. 