ABSTRACT
BACKGROUND: To study the effects of various courses of dexamethasone (DEX) combined with 5-HT3 receptor antagonists (RA) and NK-1 RA in suppressing high-grade nausea and vomiting (CINV) caused by anthracycline and cyclophosphamide chemotherapy regimens (AC or EC) in breast cancer (BC) patients. PATIENTS AND METHODS: A prospective study was performed with 252 BC patients who received AC between January, 2019 and June, 2022 in our hospital. Patients were randomly separated into control Group (N = 130) who received DEX 12 mg on day 1 and 8 mg per dose on day 2-4 and observation group (N = 122) treated with DEX 5 mg per dose on days 1-4. The response was monitored. Primary study endpoint was complete resolution (CR) of patients nausea or vomiting; secondary study endpoints included acute CR and delayed CR; and complete control (CC), acute CC, delayed CC, and safety. RESULTS: All patients underwent six rounds of chemotherapy, and no difference was found in the clinical data. CR of acute/delayed phase was (94.3%/88.5%, P > 0.05), (89.3%/90.8%, P > 0.05); total CR was (80.3%/81.5%, P > 0.05); CC was (56.6%/59.2%, P > 0.05), (64.8%/67.7%, P > 0.05); total CR was (48.4%/53.1%, P > 0.05). CONCLUSIONS: The preventive antiemetic effects of NEPA, a fixed-dose combination of netupitant and palonosetron combined with DEX 5 mg per dose on days 1-4, can be similar to DEX 12 mg on day 1 and 8 mg per dose on days 2-4, low-dose hormone with better safety, which is beneficial.