The Effects of Long-term Dosing of AMG 531 on Bone Marrow Morphology in Thrombocytopenic Subjects With Immune (Idiopathic) Thrombocytopenic Purpura (ITP)
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- Amgen
- 入组人数
- 10
- 主要终点
- The changes from baseline in bone marrow morphology by subject
研究概览
简要总结
This study was conducted in conjunction with the 2 phase 3 studies of AMG 531 (20030105 and 20030212) and an open-label extension study (20030213) and compared pretreatment and posttreatment bone marrow samples for the purpose of studying morphologic changes.
详细描述
This study is to be performed in conjunction with the phase 3 treatment studies (20030105 and 20030212) and with the open label extension study (20030213).
Subjects who are screening for participation in the phase 3 studies will be asked to consider participation in this bone marrow study. At least 10 subjects from each of the two phase 3 studies (20030105 and 20030212) will enroll in this study. This will ensure enrollment of subjects who are both non-splenectomized and splenectomized.
All subjects who participate must have had a bone marrow biopsy within one year prior to enrollment, and must release the tissue block to Amgen for interpretation by a central pathology laboratory. Subjects that do not have a historical bone marrow within one year (with available tissue block) must have a baseline bone marrow biopsy and aspirate performed prior to dosing with AMG 531.
Subjects will be assigned to a follow-up bone marrow biopsy and aspirate after either 9 months or 6 months of treatment. The subjects will be assigned to follow-up time in descending order, with the first 5 subjects from each study assigned to 9 month follow-up, and the last 5 subjects from each study assigned to 6 month follow-up. Some subjects will have their follow-up bone marrow biopsy and aspirate while on the open label extension study (20030213).
To eliminate the possibility of performing a bone marrow biopsy and aspirate on a placebo subject, all subjects who were assigned to a 6 month follow-up will be unblinded at the end of the phase 3 study treatment period (week 26). If the subject was on AMG 531, they must have their follow-up bone marrow biopsy and aspirate within one week (week 27). If the subject was on placebo, they will have their follow-up bone marrow performed after 3 months of treatment in the open label study.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Prospective
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Subjects must be enrolled in AMG 531 protocol 20030105 or 20030212
- •Subject must have had a bone marrow biopsy within one year of enrollment (with available tissue block to send to a central pathology laboratory for interpretation) or must consent to a pre-treatment bone marrow biopsy and aspirate
- •Written informed consent
排除标准
- •Subject has any kind of disorder that compromises the ability of the subject to give written informed consent and/or to comply with study procedures
结局指标
主要结局
The changes from baseline in bone marrow morphology by subject
时间窗: Entire duration of the study
次要结局
- The changes from baseline bone marrow morphology for splenectomized and non-splenectomized subjects(Entire duration of the study)
- The changes from baseline in bone marrow morphology by dose range(Entire duration of the study)
- The changes from baseline in bone marrow morphology by length of treatment with AMG 531(Entire duration of the study)