After the washout period of 2 weeks, the subjects will be required to take the medication for preventing acute CINV including combination therapy with a 5-HT3 antagonist and a corticosteroid for moderately-high to highly emetogenic chemotherapy. The patients will be divided into three groups (auricular acupuncture treatment group, sham auricular acupuncture treatment group, and non-treatment group) in order to test the effectiveness of auricular acupuncture. Group 1 patients will receive no treatment (control), after completion of the 1st chemotherapy course, Group 2 patients will receive auricular acupuncture treatment at the 2nd and 4th chemotherapy courses and will receive sham auricular acupuncture at the 3rd chemotherapy course, while Group 3 will receive sham auricular acupuncture at the 2nd and 4th chemotherapy courses and will receive auricular acupuncture at the 3rd chemotherapy course. At baseline visit and course 1, 2, 3, and 4 after chemotherapy, every subject will have efficacy evaluations by FILE, vomiting visual analog scare, WHOQOL-BREF questionnaire and Chinese Disposition Classification. Simultaneously, they will be monitored on their vital signs, complete blood counts, urinalysis, and biochemical indicators at baseline visit and the end of the trial. The collected data will then be analyzed by SAS 8.2 package.