Modeling survival distribution as a function of time to treatment discontinuation: A dynamic treatment regime approach.

TitleModeling survival distribution as a function of time to treatment discontinuation: A dynamic treatment regime approach.
Publication TypeJournal Article
Year of Publication2018
AuthorsYang, Shu, Anastasios A. Tsiatis, and Michael Blazing
JournalBiometrics
Volume74
Issue3
Pagination900-909
Date Published2018 09
ISSN1541-0420
KeywordsCardiovascular Diseases, Computer Simulation, Humans, Kaplan-Meier Estimate, Models, Statistical, Survival Analysis, Time-to-Treatment, Withholding Treatment
Abstract

We consider estimating the effect that discontinuing a beneficial treatment will have on the distribution of a time to event clinical outcome, and in particular assessing whether there is a period of time over which the beneficial effect may continue after discontinuation. There are two major challenges. The first is to make a distinction between mandatory discontinuation, where by necessity treatment has to be terminated and optional discontinuation which is decided by the preference of the patient or physician. The innovation in this article is to cast the intervention in the form of a dynamic regime "terminate treatment optionally at time v unless a mandatory treatment-terminating event occurs prior to v" and consider estimating the distribution of time to event as a function of treatment regime v. The second challenge arises from biases associated with the nonrandom assignment of treatment regimes, because, naturally, optional treatment discontinuation is left to the patient and physician, and so time to discontinuation may depend on the patient's disease status. To address this issue, we develop dynamic-regime Marginal Structural Models and use inverse probability of treatment weighting to estimate the impact of time to treatment discontinuation on a time to event outcome, compared to the effect of not discontinuing treatment. We illustrate our methods using the IMPROVE-IT data on cardiovascular disease.

DOI10.1111/biom.12845
Alternate JournalBiometrics
Original PublicationModeling survival distribution as a function of time to treatment discontinuation: A dynamic treatment regime approach.
PubMed ID29359317
PubMed Central IDPMC6054909
Grant ListP01 CA142538 / CA / NCI NIH HHS / United States
R01 HL118336 / HL / NHLBI NIH HHS / United States