A Phase 3 Substudy to Evaluate Executive Function in Adults With Phenylketonuria Who Are Participating in the Phase 3 Study, 165-302
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 9
- 试验地点
- 4
- 主要终点
- Change From Baseline in Rapid Visual Processing (RVP) Mean Response Latency (CANTAB Task)
研究概览
简要总结
A Phase 3 substudy to evaluate executive function in adults with phenylketonuria who are participating in the phase 3 Study, 165-302. Approximately 100 subjects, aged ≥ 18 to ≤ 70 years old, with PKU will be enrolled.
详细描述
Study 165-303, is a Phase 3 substudy enrolling approximately 100 subjects, aged ≥ 18 to ≤ 70 years old, with PKU who are participating in the Phase 3 study, 165-302.
Per the 165-303 protocol, the investigator does not assign a specific intervention to the study participants. In accordance with the protocol for Study 165-303, subjects were asked to perform selected set of three tasks from the CANTAB tool (Rapid Visual Processing [RVP], Spatial Working Memory [SWM], and Stop Signal Task [SST]) to assess executive function and each subject's self perception of their current state was measured using a subject global assessment questionnaire that contains seven questions about current state perception of attention, energy level, tiredness, confusion, sadness, anger and tension.
The time points for administering the above tools are as follows, which coincide with time points in part 2 and part 4 of Study 165-302: screening (entry into Part 2 165-302 Day 1 of Week 1), baseline visit (Part 2 Week 8), and 3 additional study visits at different time points in the Part 4 of 165-302 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 70 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Are currently participating in Part 1 of Study 165-302 and meet the criteria for participation in Part 2 of 165-302
- •Are willing and able to provide written, signed informed consent after the nature of the study has been explained and prior to any research-related procedures.
- •Have the ability to complete the CANTAB and subject global assessment.
- •Are willing and able to comply with all study procedures.
排除标准
- •Any condition that, in the view of the investigator, places the subject at high risk of poor compliance or terminating early from the study
结局指标
主要结局
Change From Baseline in Rapid Visual Processing (RVP) Mean Response Latency (CANTAB Task)
时间窗: Baseline to Part 2 Week 8
The RVP task measures sustained attention. In this task, a series of random digits continuously appears in the middle of the screen. Subjects are asked to recognize a specific sequence of digits and are asked to press a button on the screen whenever this specific sequence of digits appears within this series of continuous digits. RVP mean latency is the mean response latency during assessment sequence blocks where the subject responded correctly (Latency units are milliseconds). Lower scores represent better performance. Observed range for Pooled Active: -103.1 to 65.5 (change from baseline) Observed range for Pooled Placebo: -10.4 to 39.0 (change from baseline)
Change From Baseline in Spatial Working Memory (SWM) Between Errors 4-8 Boxes (CANTAB Task)
时间窗: Baseline to Part 2 Week 8
The SWM task measures visuospatial working memory. During this task, a number of boxes appears on a screen. The objective of the task is to find a token under a box and to place this token in a designated area. There is only one token under one box during each round and the location of the token rotates in each round to a different box, other than a box within which the token was found in previous rounds. The subject is therefore asked to remember which boxes previously contained tokens so as to better the chances and speed of finding tokens under boxes which did not previously contain tokens. SWM between errors measures the total number of times the subject revisits a box in which a token has previously been found in the same problem (calculated for assessed problems only). Observed range for Pooled Active: -8 to 1 (change from baseline) Observed range for Pooled Placebo: -5 to 12 (change from baseline) Lower scores represent better performance.
Change From Baseline in Stop Signal Task (SST) Stop Signal Reaction T (CANTAB Task)
时间窗: Baseline to Part 2 Week 8
The SST task measures inhibitory control and cognitive flexibility. The SST is a 2-part task. During part 1, an arrow appears on the screen and subjects are asked to press an arrow button on the screen corresponding with the direction of the arrow displayed. During part 2 of the task, subjects follow the same instructions as in part 1; however, they are asked to withhold their response (do not press an arrow button) if they hear an auditory signal (beep) when the arrow is displayed. SST stop signal delay is the length of time between the go stimulus and the stop stimulus at which the subject is able to successfully inhibit their response on 50% of trials. Lower time represents better performance. Observed range for Pooled Active: -31.6 to 48.7 (change from baseline) Observed range for Pooled Placebo: 47.8 to 72.5 (change from baseline)
次要结局
- Change From Baseline in RVP A Prime - Signal Detection Measure of Sensitivity to the Target (CANTAB Task)(Baseline to Part 2 Week 8)
- Change From Baseline in SST Proportion of Successful Stops - Measures the Proportion of Completed Stop Trials That Were Successful Stops (CANTAB Task)(Baseline to Part 2 Week 8)
- Change From the Baseline in SWM Strategy 6-8 Boxes - Number of Distinct Boxes Used by the Subject to Begin a New Search for a Token(CANTAB Task)(Baseline to Part 2 Week 8)