Predictive Factors of Overall Well-Being Using the EORTC QLQ-C15-PAL Extracted from the EORTC QLQ-C30

Objective: The European Organization of Research and Treatment of Cancer (EORTC) Quality of Life Questionnaire - Core 15 Palliative (EORTC QLQ-C15-PAL) was developed to assess quality of life (QOL) for the palliative cancer population to decrease patient burden. The purpose of this study was to compare predictive factors for well-being in the QLQ-C15-PAL extracted from the EORTC Quality of Life Questionnaire - Core 30 (QLQ-C30) with the QLQ-C30 itself. Methods and Materials: Patients with advanced cancer referred for treatment of bone metastases completed the QLQ-C30. Fifteen items from the QLQ-C15-PAL were extracted from the QLQ-C30. Univariate and multivariate analyses were used to determine predictive factors of the global QOL/health score in both tools. In the multivariate analyses, a p value of < 0.003 indicated statistical significance. Results: Overall, predictive factors were similar when analyzing data from both tools. Predictive factors for the QLQ-C30 were role functioning (p < 0.0001), fatigue (p < 0.0001), nausea/vomiting (p < 0.0001), and financial problems (p < 0.0001) and factors for the extracted QLQ-C15-PAL were physical functioning (p < 0.0001) and fatigue (p < 0.0001). Conclusions: Extraction of the QLQ-C15-PAL items from the QLQ-C30 resulted in similar predictive QOL domains for all patient subgroups analyzed individually. The QLQ-C15-PAL is reflective of the QLQ-C30 domains and is recommended for future studies involving patients in a palliative setting, as this shorter questionnaire reduces patient burden and may increase accrual and compliance, while maintaining a similar breadth of coverage and achieving the same predictive ability.