Patient-reported outcome measures are being increasingly considered both in clinical practice and in the field of health technology assessment. Although emotional distress is currently recognized as the sixth vital sign in cancer care, its early detection and screening is not yet included in routine clinical practice in Spain. The main objective of this study was to assess the psychometric properties and diagnostic accuracy of validated tools for the early detection of distress among adults with cancer in the Spanish context, at the request of the Spanish National Health System (NHS) Cancer Strategy.

A systematic review was carried out to analyze development and validation studies. The Quality Assessment of Diagnostic Accuracy Studies tool (QUADAS-2) was used for the risk of bias assessment, and a multicriteria global assessment was used for the tests. Ethical and organizational aspects were also addressed.

Fifteen validation studies were included, corresponding to seven tests. The tools considered were the Distress Thermometer (DT), the Brief Symptom Inventory-18 (BSI-18), the Edmonton Symptom Assessment System-revised (ESAS-r), the Hospital Anxiety and Depression Scale (HADS), the Visual Analog Scale for Anxiety and Depression (VAS-AD), the Detection of Emotional Distress (DED) scale, and the Psychosocial and Spiritual Needs Evaluation (ENP-E) scale. Evidence of validity, reliability (internal consistency), and diagnostic accuracy (sensitivity, specificity, and area under the receiver operating characteristic curve) were summarized. Three scales were rated as poor (VAS-AD, BSI-18, and ESAS-r), the ENP-E scale was rated as acceptable, and three scales were rated as moderate (DT, DED, and HADS).

The DT (single-item measure) stands out as an appropriate tool for early detection of emotional distress in the Spanish NHS. The use of this scale could be considered a first stage, to be combined later with a longer scale to improve screening specificity. The HADS scale could be utilized for this purpose. The use of these tools should be framed within a structured screening program that ensures further evaluation and subsequent psychological care when needed.