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Kazuhiro Takehara,Takashi Matsumoto,Junzo Hamanishi,Kosei Hasegawa,Motoki Matsuura,Kiyonori Miura,Shoji Nagao,Hidekatsu Nakai,Naotake Tanaka,Hideki Tokunaga,Kimio Ushijima,Hidemichi Watari,Yoshihito Y 대한부인종양학회 2021 Journal of Gynecologic Oncology Vol.32 No.2
Objective: The primary objective of this study was to evaluate the safety of niraparib 300 mg/dayin Japanese patients with platinum-sensitive, relapsed ovarian cancer in a maintenance setting. Methods: Phase 2, multicenter, open-label, single-arm study enrolled Japanese patients withplatinum-sensitive, relapsed ovarian cancer who had received ≥2 platinum-based regimens. The primary endpoint (incidence of grade 3 or 4 thrombocytopenia-related events within 30days after initial niraparib administration) was justified by the incidences of a global pivotalphase 3 study and its post-hoc safety analysis on thrombocytopenia, the major hematologicaladverse event of niraparib. The overall safety analysis examined other treatment-emergentadverse events (TEAEs). Results: Enrolled patients (n=19) had a median (min, max) body weight of 53.9 (40.8–79.1)kg; all but one patient weighed <77 kg. Most (94.7%) patients initially received niraparib300 mg/day but this decreased in subsequent cycles (mean±standard deviation doseintensity, 191.6±65.7 mg/day). In total, 6/19 (31.6%) patients experienced grade 3 or 4 thrombocytopenia-related events within 30 days of initial niraparib administration. Other common TEAEs included nausea, and decreased platelet or neutrophil counts. Noprogression-free or overall survival events occurred; only 1 of 4 response-evaluable patientshad a post-baseline tumor assessment (stable disease). Conclusion: The incidence of grade 3 or 4 thrombocytopenia-related events in Japaneseovarian cancer patients was similar to that in the corresponding non-Japanese study. Overall,the safety profile was acceptable and consistent with the known safety profile and previousexperience with niraparib. Trial Registration: ClinicalTrials.gov Identifier: NCT03759587