2021
DOI: 10.3390/cancers13133068
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The Evaluation of Health-Related Quality of Life Issues Experienced by Patients with Desmoid-Type Fibromatosis (The QUALIFIED Study)—A Protocol for an International Cohort Study

Abstract: Sporadic desmoid-type fibromatosis (DTF) is a rare soft tissue tumour with an unpredictable clinical course. These tumours are incapable of metastasising, but their local aggressive tumour growth and tendency to recur locally can result in a substantial symptom burden. Measuring the impact of DTF on health-related quality of life (HRQoL) can be challenging due to the variable clinical presentation of the disease. Therefore, a HRQoL instrument assessing DTF-specific issues is needed. The QUALIFIED study aims to… Show more

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Cited by 12 publications
(28 citation statements)
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“…Related studies have shown that the EORTC QLQ-C30 has good reliability and validity for evaluating the quality of life of patients with cancer. 14 The EORTC QLQ-C30 score is calculated on a scale of 1–4. Here, we followed the EORTC scoring manual.…”
Section: Methodsmentioning
confidence: 99%
“…Related studies have shown that the EORTC QLQ-C30 has good reliability and validity for evaluating the quality of life of patients with cancer. 14 The EORTC QLQ-C30 score is calculated on a scale of 1–4. Here, we followed the EORTC scoring manual.…”
Section: Methodsmentioning
confidence: 99%
“…The development consisted of three distinct phases. Phase I and II have been conducted previously, and are described in detail elsewhere [16,24]. The provisional DTFspecific HRQoL questionnaire, the DTF-QoL, was pre-tested in a sample of DTF patients to test construct validity and reliability.…”
Section: Questionnaire Developmentmentioning
confidence: 99%
“…The sample included 236 patients (United Kingdom (UK): n = 80; Netherlands (NL): n = 156) who participated in the QUALIFIED study (The evaluation of health-related quality of life issues experienced by patients with desmoid-type fibromatosis; registered at clinicaltrials.gov (accessed on 1 July 2021): NCT04289077) [24]. The QUALIFIED study is an international, multicentre, cross-sectional, observational cohort study among adult (≥18 years) patients with sporadic DTF who were treated in one of the participating centres (one centre in the UK; three centres in the NL).…”
Section: Study Sample and Data Collectionmentioning
confidence: 99%
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“…These DTF-specific HRQoL issues are not captured by generic or cancer-generic HRQoL questionnaires, such as the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire Core 30 (EORTC QLQ-C30), which are predominantly used in DTF studies and in clinical care [ 17 ]. Therefore, a DTF-specific HRQoL questionnaire, the DTF-QoL, was recently developed by our group, which can be used to evaluate the prevalence of HRQoL issues in DTF patients [ 18 , 19 ]. Furthermore, the small number of previous studies focused on the population of DTF patients as a whole because of small sample sizes.…”
Section: Introductionmentioning
confidence: 99%