“…None of the systematic reviews done so far (no inclusion of palonosetron) have clearly demonstrated superiority of one agent over another. These studies included a comparison of granisetron, ondansetron, tropisetron and dolasetron, using all studies as references rather than head-to-head trials [31], and meta-analyses of randomised trials comparing granisetron with ondansetron [32], granisetron or tropisetron with ondansetron [33]. A recently performed meta-analysis of more than 40 cisplatin and non-cisplatin based studies showed an equivalence of ondansetron and granisetron, a significant advantage for granisetron over tropisetron, and no clear advantage of ondansetron over tropisetron [34,35].…”