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Open AccessJournal ArticleDOI

Alternative Analysis Methods for Time to Event Endpoints Under Nonproportional Hazards: A Comparative Analysis

TLDR
The log-rank test is most powerful under proportional hazards (PH) as mentioned in this paper, however, non-PH patterns are often observed in clinical trials, such as in immuno-oncology; therefore, alternative methods ar...
Abstract
The log-rank test is most powerful under proportional hazards (PH). In practice, non-PH patterns are often observed in clinical trials, such as in immuno-oncology; therefore, alternative methods ar...

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Journal ArticleDOI

Durvalumab alone and durvalumab plus tremelimumab versus chemotherapy in previously untreated patients with unresectable, locally advanced or metastatic urothelial carcinoma (DANUBE): a randomised, open-label, multicentre, phase 3 trial

Thomas Powles, +206 more
- 01 Dec 2020 - 
TL;DR: The overall survival of patients who received durvalumab (a PD-L1 inhibitor), with or without tremelimumab ( a CTLA-4 inhibitor), as a first-line treatment for metastatic urothelial carcinoma was assessed.
Journal ArticleDOI

Robust Design and Analysis of Clinical Trials With Nonproportional Hazards: A Straw Man Guidance From a Cross-Pharma Working Group

TL;DR: In this article, a log-rank test was used to evaluate the risk of nonproportional hazard in a clinical trial where NPH is a possibility and loss of power and clear description of treatment differences are key issues in designing and analyzing clinical trials.
Posted Content

Robust Design and Analysis of Clinical Trials With Non-proportional Hazards: A Straw Man Guidance from a Cross-pharma Working Group

TL;DR: Design and analysis considerations based on a combination test under different non-proportional hazard types and a straw man proposal for practitioners are provided.
Journal ArticleDOI

The hazards of period specific and weighted hazard ratios

TL;DR: How to adequately handle nonproportional hazards (NPH) in clinical trials is an important and timely question, particularly given recent advances in immuno-oncology treatments.
References
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Book ChapterDOI

Nonparametric Estimation from Incomplete Observations

TL;DR: In this article, the product-limit (PL) estimator was proposed to estimate the proportion of items in the population whose lifetimes would exceed t (in the absence of such losses), without making any assumption about the form of the function P(t).
Journal ArticleDOI

Proportional hazards tests and diagnostics based on weighted residuals

TL;DR: In this article, Chen et al. showed that a treatment effect that decreases with time can be directly visualized by smoothing an appropriate residual plot, which can be expressed as a weighted least-squares line fitted to the residual plot.
Journal ArticleDOI

Enhanced secondary analysis of survival data: reconstructing the data from published Kaplan-Meier survival curves

TL;DR: An algorithm that maps from digitised curves back to KM data by finding numerical solutions to the inverted KM equations is developed, which is a reliable tool for meta-analysis and cost-effectiveness analyses of RCTs reporting time-to-event data.
Journal ArticleDOI

Linear rank tests with right censored data

TL;DR: In this article, linear rank statistics are developed for tests on regression coefficients with censored data, which arise as score statistics based on the marginal probability of a generalized rank vector, and the observed Fisher information provides a variance estimator generally, while in certain special cases a permutation approach to variance estimation is also possible.
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