Sustainability of antiemetic responses with APF530 (sustained-release granisetron) during multiple cycles of moderately (MEC) and highly (HEC) emetogenic chemotherapy regimens: Results of a randomized phase III trial.

Abstract

9626 Background: Patients receiving MEC or HEC were administered subcutaneous (SC) APF530 500 mg, a sustained delivery formulation of granisetron (10 mg). The complete antiemetic response rates (CR; no emetic episodes and no rescue medication) were non-inferior to those of palonosetron in preventing acute and delayed chemotherapy-induced nausea and vomiting (CINV) (Grous et al. ASCO 2009, #9627). We report on sustainability of CR with APF530 (10 mg) during multiple chemotherapy cycles in this study. Methods: 1428 patients scheduled to receive single doses of MEC or HEC were randomized to APF530 SC (5 or 10 mg granisetron) or 0.25 mg palonosetron intravenously (IV) prior to cycle 1 (C1). In C2-4, patients who received palonosetron in C1 were randomized to APF530 5 or 10 mg; those who received APF530 continued with their C1 APF530 dose. Treatment cycles were separated by 7-28 days. CR rates were compared between cycles using McNemar’s test. Results: No significant differences in within-cycle CR occurred between APF530 doses during acute and delayed phases in C2-4 for MEC and HEC, but a trend toward higher CR rates was seen in successive cycles. For the 2 doses, CR was sustained across all 4 cycles in 56.5-62.6% and 68.4-71.7% in acute phase, and 41.8-42.4% and 57.5-57.9% in delayed phase with MEC and HEC, respectively. Examination of CR rates in C2, C3, or C4 compared with the rate in C1 showed that CR rates were sustained and that the proportion of patients with no CR in C1 but CR in later cycles was consistently higher than that of patients with CR in C1 but no CR later. For illustration, the table shows C4 CR and C1 CR for patients who received APF530 10 mg in C1 and C4. Conclusions: CR rates achieved with APF530 during acute and delayed phases of CINV in MEC and HEC were maintained over multiple cycles. Clinical trial information: NCT00343460. [Table: see text]