Aprepitant Without Steroid in Preventing Chemotherapy-induced Nausea and Vomiting in Patients With Colorectal Cancer

Inclusion Criteria:

• Diagnosis of colorectal cancer
• No prior chemotherapy and scheduled to receive FOLFOX chemotherapy (oxaliplatin,leucovorin and 5-fluorouracil)
• Age ≥18 years
• Eastern Cooperative Oncology Group (ECOG) Performance Status 0, 1 or 2
• Laboratory index: Hemoglobin ≥ 90 g/L (No blood transfusion within 14 days), AbsoluteNeutrophil Count ≥ 1.5×10^9/L, Platelet Count ≥ 75×10^9/L, Serum Bilirubin ≤ 1.5×ULN,ALT and AST ≤ 3.0×ULN (without liver metastases), ALT and AST ≤ 5.0×ULN (with livermetastases), Serum Creatinine ≤ 1×ULN, Endogenous Creatinine Clearance>60ml/min
• Be able to read, understand and complete the questionnaire and diary
• Be able to understand the study procedures and sign informed consent.

Exclusion Criteria:

• Treatment with any other study medicine within 4 weeks before enrollment.
• Nausea or vomiting ≤ 24 hours prior to registration
• Ongoing emesis due to obstruction of digestive tract
• Concurrent use of olanzapine, phenothiazine or amifostine
• Female with pregnancy or lactation
• Severe cognitive compromise
• Known history of CNS disease (e.g. brain metastases, seizure disorder)
• Concurrent abdominal radiotherapy
• Chronic alcoholism
• Known hypersensitivity to aprepitant, tropisetron, or dexamethasone.
• Known cardiac arrhythmia, uncontrolled congestive heart failure or acute myocardialinfarction within the previous six months.
• History of uncontrolled diabetes mellitus
• Serious or uncontroled infection
• Known active HIV, viral hepatitis or tuberculosis infections