The investigators propose to totally abolish the emesis (vomiting) associated with the regimen of oxaliplatin + topotecan by adding a daily administration of aprepitant (Emend) for 17 days to the HT3 blocker routinely given on days 1 and 15.

Patients enrolled in NCT0031361, NYU 03-67 (A Phase II study of Oxaliplatin combined with continuous infusion topotecan as chemotherapy for patients with previously treated ovarian cancer NCI #6317) will receive oxaliplatin 85mg/m2 as a 2-hr IV infusion on D1, 15 and topotecan 0.4mg/m2/day as a continuous infusion for 14 days beginning on D1 (D1-15) on a 4 week cycle.

On days 1 and 15 of the first cycle, patients will also receive IV ondansetron 32 mg and 10mg of dexamethasone. Emend 125 mg will be given on day 1; on days 2-17, patients will be given daily oral 80mg Emend without dexamethasone.

On cycles 2-6 patients opting to continue to receive Emend as above: Emend 125 mg will be given on day 1; on days 2-17, patients will be given daily oral 80mg Emend without dexamethasone.

Following cycle 1, Emend will be given in its conventional schedule (i.e., d 1-3, and d 15-17) unless after discussion with the Principal Investigator, the patient's request to receive drug as in cycle 1 is deemed desirable and safe to enter the optional extension arm.

Inclusion Criteria:

• All patients fulfilling the requirement for entering the study NYU 03-67 will be eligible to enter the supplementary protocol with Emend. Please see NCT0031361 for eligibility.

Exclusion Criteria:

• Patients not enrolled on NYU 03-67(NCT0031361).