<qa>  What is the standard of care?If you are still eligible to take part in this study, you will be randomly assigned as in the roll of the dice to one of 3 treatment groups. Participants in the first group will be given Ondansetron as an intravenous IV--through a needle in your vein continuous infusion, from 30 minutes before your chemotherapy treatment until 12 hours after chemotherapy ends. This is considered the standard of care. 