优化单样样本测试对单个和双阶段瘤学试验中的比例进行优化
1Roswell Park Comprehensive Cancer Center, Department of Biostatistics and Bioinformatics, Elm and Carlton Streets, Buffalo, NY 14623, USA.
Cancers
|August 14, 2025
概括
一种新的基于卷积的方法通过减少样本大小和成本来改善早期瘤学试验设计. 这种方法提供了精确的I型错误控制,使临床试验更加有效和灵活.
科学领域:
- 生物统计学 生物统计学
- 临床试验设计 临床试验设计
- 瘤学研究研究
背景情况:
- 由于疾病的成本或稀有性,II期瘤学试验经常使用单臂设计.
- 传统的方法,如精确的二项式测试和西蒙的两阶段设计,往往是保守的,导致实际的I型错误率低于名义的alpha.
- 这种保守性可能导致效率低下的试验设计,样本大小大于必要.
研究的目的:
- 为早期瘤学试验设计开发一种新,灵活和高效的方法.
- 为了保持精确的I型错误控制,同时提高设计效率.
- 为现有的保守的试验设计方法提供实用的替代方案.
主要方法:
- 提出了一个基于卷积的统计方法,它结合了二项式和模拟的正常分布.
- 该方法为真实响应率 (π) 构建了一个不偏见的估计器.
- 理论性质是衍生出来的,性能是根据一阶段和两阶段设计的传统精确测试来评估的.
主要成果:
- 与标准方法相比,拟议的方法产生了更高效的试验设计,样本大小较小.
- I型错误率是精确控制的,与名义alpha水平相匹配.
- 引入了一种新的两阶段设计,并进行了临时徒劳性分析,证明了试验成本和持续时间的显著降低.
结论:
- 基于卷积的方法为早期瘤学试验设计提供了灵活和高效的替代方案.
- 它有效地解决了传统方法的保守性.
- 该方法提供了实用优势,包括减少资源利用和缩短研究时间表.
更多相关视频
09:32Multiplexed Immunofluorescence Analysis and Quantification of Intratumoral PD-1+ Tim-3+ CD8+ T Cells
Published on: February 8, 2018
14.8K
07:13Comparison of Predictive Performance of Three Lymph Node Staging Systems in Colorectal Signet Ring Cell Carcinoma Based on Machine Learning Model
Published on: April 18, 2025
194
相关概念视频
01:20Comparing the Survival Analysis of Two or More Groups
286
Survival analysis is a cornerstone of medical research, used to evaluate the time until an event of interest occurs, such as death, disease recurrence, or recovery. Unlike standard statistical methods, survival analysis is particularly adept at handling censored data—instances where the event has not occurred for some participants by the end of the study or remains unobserved. To address these unique challenges, specialized techniques like the Kaplan-Meier estimator, log-rank test, and...
286
01:24Testing a Claim about Population Proportion
3.4K
A complete procedure for testing a claim about a population proportion is provided here.
There are two methods of testing a claim about a population proportion: (1) Using the sample proportion from the data where a binomial distribution is approximated to the normal distribution and (2) Using the binomial probabilities calculated from the data.
The first method uses normal distribution as an approximation to the binomial distribution. The requirements are as follows: sample size is large...
There are two methods of testing a claim about a population proportion: (1) Using the sample proportion from the data where a binomial distribution is approximated to the normal distribution and (2) Using the binomial probabilities calculated from the data.
The first method uses normal distribution as an approximation to the binomial distribution. The requirements are as follows: sample size is large...
3.4K
01:21Cancer Survival Analysis
455
Cancer survival analysis focuses on quantifying and interpreting the time from a key starting point, such as diagnosis or the initiation of treatment, to a specific endpoint, such as remission or death. This analysis provides critical insights into treatment effectiveness and factors that influence patient outcomes, helping to shape clinical decisions and guide prognostic evaluations. A cornerstone of oncology research, survival analysis tackles the challenges of skewed, non-normally...
455
01:19The Mantel-Cox Log-Rank Test
554
The Mantel-Cox log-rank test is a widely used statistical method for comparing the survival distributions of two groups. It tests whether a statistically significant difference exists in survival times between the groups without assuming a specific distribution for the survival data, making it a non-parametric test. This flexibility makes the log-rank test particularly valuable in medical research and other fields where the timing of an event, such as death or disease recurrence, is of...
554
01:23Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches
174
Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast,...
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast,...
174
01:20Sample Proportion and Population Proportion
5.7K
Collecting samples or responses from an entire population takes significant time and effort, so a researcher collects responses from only a sample of that population. Suppose a study needs to collect information about a specific mobile application. After sample collection, the researcher analyzes the data and discovers that most individuals in the sample use that specific mobile application. The sample proportion measures the number of individuals in a sample who either use or don't use the...
5.7K