Volume 10 Supplement 1

First European Congress on Hereditary ATTR amyloidosis

Open Access

Positive real-world effectiveness of tafamidis for delaying disease progression in transthyretin familial amyloid polyneuropathy

  • Michelle Stewart1,
  • Denis Keohane1,
  • Sarah Short1,
  • Jose Alvir1,
  • Moh-Lim Ong1 and
  • Rajiv Mundayat1
Orphanet Journal of Rare Diseases201510(Suppl 1):P4

https://doi.org/10.1186/1750-1172-10-S1-P4

Published: 2 November 2015

Background

Tafamidis (Vyndaqel) was approved by the EMA in 2011 and is emerging as the standard of care for transthyretin familial amyloid polyneuropathy (TTR-FAP) in clinical settings. Efficacy was demonstrated in the clinical trials, yet little is known about its real-world effectiveness. A global disease registry, the Transthyretin Amyloidosis Outcomes Survey (THAOS), collects data on both treated and untreated patients from real-world settings. Ethics committee approval was obtained prior to patient enrolment.

Objective

To demonstrate the real-world effectiveness of tafamidis.

Methods

THAOS registry data were used to match 258 treated patients to untreated controls in a 1:4 non-randomized retrospective cohort study. Genetic mutation, birth region, and propensity scores derived from clinical status variables were used in matching. Descriptive statistics were calculated. Treatment effects were tested by repeated measures analyses with appropriate covariates (age, gender, disease duration, propensity score, and baseline values).

Results

The matched sample was predominantly Val30Met (93%) with roughly equal gender ratio (52% male) and an average age of 41.4 years. Less disease progression was seen in the tafamidis treated group over 24 months on neurological and quality of life endpoints. The neurologic endpoints with statistically significance favoring tafamidis include the derived NIS-LL and the Neurologic Composite Score including sub-scores. The Norfolk TQoL Score was also statistically significant favoring tafamidis treatment. No significant differences were found for the modified BMI or the Karnofsky Performance Status Index.

Conclusion

Tafamidis treatment resulted in less neurological progression. The results extend the efficacy observed in the clinical trials to real-world clinical settings.

Authors’ Affiliations

(1)
Pfizer Inc.

Copyright

© Stewart et al. 2015

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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