Posttraumatic stress disorder among cancer patients-Findings from a large and representative interview-based study in Germany.

Objective: In order to optimize psycho-oncologic care for patients with severe stressor-related symptomatology, we aimed to provide (a) valid and generalizable prevalence rates of posttraumatic stress disorder (PTSD) in oncological patients and (b) the percentage of PTSD cases elicited by cancer-related events.

Methods: This multi-center study was based on a representative sample of patients across cancer types. A diagnostic interview (CIDI-O) was used to assess PTSD according to DSM-IV. We first describe type and frequency of potentially traumatic events (A1-events) and the degree to which they meet the trauma criteria (A2-events). Subsequently, we present adjusted prevalence rates of PTSD and explore the proportion of patients with cancer-related PTSD.

Results: Four thousand twenty patients participated (response rate: 68 %), and 2141 completed the diagnostic interview; 1641 patients reported at least one A1-event, of whom 16% (n = 257) reported cancer-related events. Ninety-one percent (n = 232) of theses cancer-related events qualified as A2-events. Across cancer types, the adjusted 4-week prevalence of PTSD was 2.0% (95% CI, 1.5-2.7); 9% (n = 5) of the 4-week PTSD cases were cancer-related.

Conclusions: Across cancer types and treatment settings, few cancer patients fulfilled diagnostic criteria for PTSD. Of those, a mere fraction was attributable to cancer-related events. These robust findings should be taken into account in both research and practice to develop and provide adequate care for cancer patients with severe stressor-related symptomatology.