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Prospective e memory impairment related to cancer: a systematic review

Cognitive complaints and alterations related to cancer may reduce well-being, quality of life, and daily functioning. More recently, prospective memory (PM), i.e., the ability to plan a future intention, to maintain it during a variable delay time in which people are typically engaged in other tasks, and to retrieve it when the expected circumstances arise, has fostered increased attention in cancer research. Examples are to remember to ask for a certain information during a medical appointment (event-based PM/EBPM) or to take medication at certain hours (time-based PM/TBPM). This work aimed to provide an overview of the main findings related to PM functioning in people with history of cancer. A qualitative systematic review of the literature was conducted following the PRISMA guidelines and 20 articles published between 2000 and 2020 were included. People with cancer history (vs. healthy controls) tended to report more PM complaints and worst objective PM performance, especially when considering EBPM tasks. Some treatments such as chemotherapy, androgen deprivation therapy, and radiotherapy negatively impacted PM. Importantly, changes in PM were associated with lower quality of life. Also, fatigue and depression appeared to contribute to PM impairment. A puzzling finding was the lack of association between objective and subjective measures of PM, which implies that different facets might underly cancer-related PM changes. Taken together, the inclusion of PM measures when probing cancer-related cognitive impairment is relevant not only to better assess and characterize the cancer experience across time, but also to inform interventions and cognitive rehabilitation approaches.