The European Organisation for Research and Treatment of Cancer Core Quality of Life Questionnaire (QLQ-C30) was used to assess QoL at baseline (i.e., on day 8 or 7 before allo-HSCT) [19 (link)]. The QLQ-C30 includes five functional scales (role, physical, cognitive, emotional and social), three symptom scales (nausea/vomiting, fatigue, and pain), and six single items (insomnia, dyspnea, appetite loss, constipation, diarrhea, and financial problems). This questionnaire also includes a global health status/quality of life (QoL) scale. All scales and single items are transformed into standardized scores ranging from 0 to 100, with higher scores for the functioning scales and global health status/QoL scale indicating better outcomes, while higher scores on the symptom scales and single items indicate greater symptom severity [19 (link)].
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