General information
ONCOLOGY
A group of patients who visited Ordos Central Hospital’s Department of Medical Oncology between March 2019 and December 2020 was collected. They were administered the highly emetogenic chemotherapy drug cisplatin in divided doses. Before chemotherapy, 10ml of peripheral blood was drawn from 89 patients, whose treatment consisted of olanzapine or aprepitant coupled with dexamethasone and 5-HT3RA randomly selected by random number table. As there were duplicate patients enrolled in different chemotherapy cycles, finally, there were a total of 190 cases. Among them, the olanzapine group had 94 cases and the aprepitant group had 96 cases. The baseline characteristics of the two groups are comparable, as shown in Table 
Patients baseline characteristics (n(%))