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Persistence on therapy and propensity matched outcome comparison of two subcutaneous interferon beta 1a dosages for multiple sclerosis.


ABSTRACT:

Objectives

To compare treatment persistence between two dosages of interferon ?-1a in a large observational multiple sclerosis registry and assess disease outcomes of first line MS treatment at these dosages using propensity scoring to adjust for baseline imbalance in disease characteristics.

Methods

Treatment discontinuations were evaluated in all patients within the MSBase registry who commenced interferon ?-1a SC thrice weekly (n?=?4678). Furthermore, we assessed 2-year clinical outcomes in 1220 patients treated with interferon ?-1a in either dosage (22 µg or 44 µg) as their first disease modifying agent, matched on propensity score calculated from pre-treatment demographic and clinical variables. A subgroup analysis was performed on 456 matched patients who also had baseline MRI variables recorded.

Results

Overall, 4054 treatment discontinuations were recorded in 3059 patients. The patients receiving the lower interferon dosage were more likely to discontinue treatment than those with the higher dosage (25% vs. 20% annual probability of discontinuation, respectively). This was seen in discontinuations with reasons recorded as "lack of efficacy" (3.3% vs. 1.7%), "scheduled stop" (2.2% vs. 1.3%) or without the reason recorded (16.7% vs. 13.3% annual discontinuation rate, 22 µg vs. 44 µg dosage, respectively). Propensity score was determined by treating centre and disability (score without MRI parameters) or centre, sex and number of contrast-enhancing lesions (score including MRI parameters). No differences in clinical outcomes at two years (relapse rate, time relapse-free and disability) were observed between the matched patients treated with either of the interferon dosages.

Conclusions

Treatment discontinuations were more common in interferon ?-1a 22 µg SC thrice weekly. However, 2-year clinical outcomes did not differ between patients receiving the different dosages, thus replicating in a registry dataset derived from "real-world" database the results of the pivotal randomised trial. Propensity score matching effectively minimised baseline covariate imbalance between two directly compared sub-populations from a large observational registry.

SUBMITTER: Kalincik T 

PROVIDER: S-EPMC3660604 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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Persistence on therapy and propensity matched outcome comparison of two subcutaneous interferon beta 1a dosages for multiple sclerosis.

Kalincik Tomas T   Spelman Timothy T   Trojano Maria M   Duquette Pierre P   Izquierdo Guillermo G   Grammond Pierre P   Lugaresi Alessandra A   Hupperts Raymond R   Cristiano Edgardo E   Van Pesch Vincent V   Grand'maison Francois F   La Spitaleri Daniele D   Rio Maria Edite ME   Flechter Sholmo S   Oreja-Guevara Celia C   Giuliani Giorgio G   Savino Aldo A   Amato Maria Pia MP   Petersen Thor T   Fernandez-Bolanos Ricardo R   Bergamaschi Roberto R   Iuliano Gerardo G   Boz Cavit C   Lechner-Scott Jeannette J   Deri Norma N   Gray Orla O   Verheul Freek F   Fiol Marcela M   Barnett Michael M   van Munster Erik E   Santiago Vetere V   Moore Fraser F   Slee Mark M   Saladino Maria Laura ML   Alroughani Raed R   Shaw Cameron C   Kasa Krisztian K   Petkovska-Boskova Tatjana T   den Braber-Moerland Leontien L   Chapman Joab J   Skromne Eli E   Herbert Joseph J   Poehlau Dieter D   Needham Merrilee M   Bacile Elizabeth Alejandra Bacile EA   Arruda Walter Oleschko WO   Paine Mark M   Singhal Bhim B   Vucic Steve S   Cabrera-Gomez Jose Antonio JA   Butzkueven Helmut H  

PloS one 20130521 5


<h4>Objectives</h4>To compare treatment persistence between two dosages of interferon β-1a in a large observational multiple sclerosis registry and assess disease outcomes of first line MS treatment at these dosages using propensity scoring to adjust for baseline imbalance in disease characteristics.<h4>Methods</h4>Treatment discontinuations were evaluated in all patients within the MSBase registry who commenced interferon β-1a SC thrice weekly (n = 4678). Furthermore, we assessed 2-year clinica  ...[more]

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