Background
It is good medical practice to use validated questionnaires to compare different treatment options in oncological therapy studies. Over the course of the past few years, it has been suggested that patient-reported outcome measures (PROMs) could also be of value in monitoring individual treatment schemes, especially in the palliative care setting, where quality of life (QoL) is of primary importance. Although the EORTC-QLQ-C30 comprises a set of personal questions, patients are not asked about the subjectively assessed functional impairment associated with the symptom in their individual life situation.
Methods
We examined whether the results of the EORTC QLQ C-30, one of the most frequently used QoL questionnaires, would be different if the subjective interpretation of symptoms assessed on a function scale, such as physical functioning, are added to the scores. For each of the five functional scales of the EORTC-QLQ C30 the patients were asked to provide a subjective weighting, e.g. "How would you currently rate your physical functioning on a scale from 1 to 5?". A total of 95 answers from 13 patients were evaluated in part at several time points of their therapy. All patients included in this study had various cancers and were receiving only symptomatic but not curative radiation therapy (cerebral or bone).
Results
By adding the weighting question 86% of answers changed, with 39% of the answers being more positive and 47 % more negative when comparing EORTC QLQ-C30 results and subjective rating.
Conclusion
The above results show that the addition of the question of functional impairment resulting from a symptom might enable the use of standard questionnaires like the EORTC QLQ-C30 as an instrument for individual therapy management. Further investigation into how the standard questionnaire needs to be adapted is clearly needed und justified.