Development and validation of the mastocytosis activity score.

Abstract:

BACKGROUND:Mastocytosis is a heterogeneous disease characterized by a clonal expansion of mast cells in various organs. The vast majority of patients suffer from signs and symptoms caused by mediator release from mast cells. Although the disease burden is high, there is currently no specific and validated instrument to measure and monitor signs and symptoms in patients with mastocytosis. OBJECTIVE:To develop and validate a disease-specific tool to measure and monitor the activity of signs and symptoms in patients with mastocytosis, the Mastocytosis Activity Score (MAS). METHODS:Nineteen potential MAS items were developed in a combined approach consisting of semi-structured patient interviews, expert input and literature research. Item selection was performed by impact analysis with 76 patients followed by a review for face validity. The resulting MAS was tested for validity, reliability and influence factors. In parallel, a US American English version of the MAS was developed. RESULTS:A total of 68 mastocytosis patients took part in the MAS validation study. The final 9-item MAS was found to have a three-domain structure ("skin," "gastrointestinal tract" and "other"), a valid total score and an excellent test-retest reliability. Multiple regression analysis revealed that disease duration, age or gender is not a significant determinant of the MAS results. CONCLUSIONS:The MAS is a disease-specific, valid and reliable patient-reported outcome measure for adult patients with cutaneous and indolent systemic mastocytosis. It may serve as a valuable tool to measure and monitor mastocytosis activity, both, in clinical trials and in routine care.

journal_name

Allergy

journal_title

Allergy

authors

Siebenhaar F,Sander B,Ho LHT,Ellrich A,Maurer M,Weller K

doi

10.1111/all.13425

subject

Has Abstract

pub_date

2018-07-01 00:00:00

pages

1489-1496

issue

7

eissn

0105-4538

issn

1398-9995

journal_volume

73

pub_type

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