Celio, L., Bonizzoni, E., De Braud, F., Agustoni, F., & Aapro, M. (2016). Should clinicians always administer dexamethasone beyond 24 h after chemotherapy to control delayed nausea and vomiting caused by moderately emetogenic regimens? Insight from the re-evaluation of two randomized studies. Supportive Care in Cancer, 24, 1025–1034.
To determine the effectiveness of dexamethasone against delayed chemotherapy-induced nausea and vomiting (CINV) in patients receiving moderately emetogenic chemotherapy (MEC) or anthracycline plus cyclophosphamide (AC)
This reanalysis consisted of of two cohorts of chemotherapy-naïve patients who were included in two phase 3, randomized, controlled trails investigating a dexamethasone-sparing regimen. Participants were randomized to receive palonosetron (0.25 mg IV) plus dexamethasone (8 mg IV) on day 1 of chemotherapy or the same regimen followed by oral dexamethasone on days 2 and 3 in the MEC and AC regimens. Patients were divided according to the effectiveness of prophylaxis against acute CINV as either high- (experienced neither vomiting nor moderate-to-severe nausea) or low-risk (experienced vomiting or moderate to severe CINV).
Secondary analysis of two phase 3, randomized, controlled trials
The dexamethasone-sparing regimen (three-day) achieved excellent control of delayed symptoms in patients with no acute CINV and for low-risk patients receiving AC, but it was less effective in patients receiving HEC. Additional dexamethasone doses could be offered selectively.
Patients receiving AC regimens are at an increased risk of experiencing delayed CINV. Some patients might not benefit from a dexamethasone-sparing antiemetic regimen. In this study, the reduction of dexamethasone was less effective for patients at a high risk. Extending the use of dexamethasone could produce adverse effects, so selective dexamethasone prescriptions should be individualized.