This randomized phase III trial studies how well olanzapine with or without fosaprepitant
work in preventing chemotherapy induced nausea and vomiting in cancer patients receiving
chemotherapy that causes vomiting. Olanzapine and fosaprepitant dimeglumine may help control
nausea and vomiting in patients during chemotherapy. Olanzapine is usually given in
combination with other drugs, including fosaprepitant dimeglumine. It is not yet known if
olanzapine when given with other drugs, is still effective without using fosaprepitant
dimeglumine for controlling nausea and vomiting.