Examining the relationship between multiple primary cancers and psychological distress: A systematic literature review.

Abstract

214 Background: The incidence of multiple primary cancers (MPC) in cancer survivors is increasing. However, little is known about the psychological effects of MPCs on cancer survivors. The purpose of this systematic review was to synthesize the evidence regarding the impact of MPC on psychological distress in cancer survivors. Methods: Relevant studies were identified in PubMed database (up to June 2015). Non-English articles were excluded. Two independent evaluators reviewed articles for relevancy and data extraction. Data was organized and recorded using a coding log with exclusionary rationale, a PRISMA flow diagram, and a standardized table of evidence. Effect sizes (ES) were calculated using Cohen’s d to measure relationship magnitude and direction. Results: Of the 543 potentially relevant articles identified, four articles met criteria and were retained for analysis. Different quality of life (QOL) measures were used to assess psychological distress across studies, so ES were calculated for individual studies. There were consistently small but significant ES found for the impact of MPC on distress. When compared to survivors of a single cancer: one study found lower global QOL and higher total stress (ES, 0.1430 and 0.3653); one study reported that those with MPC were more likely to experience frequent mental distress and sleep problems (ES, 0.1404 and 0.2235); and one study found that those with MPC had lower global QOL and emotional function and greater anxiety and depressive symptoms (ES range, 0.1026 - 0.3215). Finally, the one study that evaluated suicidal ideation in survivors of childhood cancers did not find a higher incidence among those with MPC. Conclusions: The ES noted in the four studies suggest a small but significant increase in psychological distress in survivors of MPC compared to survivors of a single cancer. Clinicians should be aware of this at-risk population when screening for distress in cancer survivors. Additional studies that control for care transition points known to increase distress are warranted to explore the impact of MPC on psychological distress over time. Additionally, as the science in this area grows, it will be necessary to reevaluate the literature.