<qa>  What is the standard prophylactic anti-emetic combination of granisetron- Evaluate the efficacy of the addition of aprepitant in controlling acute vomiting with the standard prophylactic anti-emetic combination of granisetron hydrochloride and dexamethasone in patients receiving therapy comprising high-dose cyclophosphamide to mobilize stem cells prior to leukapheresis for autologous stem cell transplantation. 