Abstract: We included 26 studies (18 RCTs and 8 NRCTs) with sample sizes of 41 to 1012 participants, involving a total of 7654 adults with cancer. Two studies included only men or women; all other studies included both sexes. For most studies people with breast, lung, head and neck, colorectal, prostate cancer, or several of these diagnoses were included; some studies included people with a broader range of cancer diagnosis. Ten studies focused on a solitary screening intervention, while the remaining 16 studies evaluated a screening intervention combined with guided actions. A broad range of intervention instruments was used, and were described by study authors as a screening of health-related quality of life (HRQoL), distress screening, needs assessment, or assessment of biopsychosocial symptoms or overall well-being. In 13 studies, the screening was a self-reported questionnaire, while in the remaining 13 studies an interventionist conducted the screening by interview or paper-pencil assessment. The interventional screenings in the studies were applied 1 to 12 times, without follow-up or from 4 weeks to 18 months after the first interventional screening. We assessed risk of bias as high for eight RCTs, low for five RCTs, and unclear for the five remaining RCTs. There were further concerns about the NRCTs (1 = critical risk study; 6 = serious risk studies; 1 = risk unclear). Due to considerable heterogeneity in several intervention and study characteristics, we have reported the results narratively for the majority of the evidence. In the narrative synthesis of all included studies, we found very low-certainty evidence for the effect of screening on HRQoL (20 studies). Of these studies, eight found beneficial effects of screening for several subdomains of HRQoL, and 10 found no effects of screening. One study found adverse effects, and the last study did not report quantitative results. We found very low-certainty evidence for the effect of screening on distress (16 studies). Of these studies, two found beneficial effects of screening, and 14 found no effects of screening. We judged the overall certainty of the evidence for the effect of screening on HRQoL to be very low. We found very low-certainty evidence for the effect of screening on care needs (seven studies). Of these studies, three found beneficial effects of screening for several subdomains of care needs, and two found no effects of screening. One study found adverse effects, and the last study did not report quantitative results. We judged the overall level of evidence for the effect of screening on HRQoL to be very low. None of the studies specifically evaluated or reported adverse effects of screening. However, three studies reported unfavourable effects of screening, including lower QoL, more unmet needs, and lower satisfaction. Three studies could be included in a meta-analysis. The meta-analysis revealed no beneficial effect of the screening intervention on people with cancer HRQoL (mean difference (MD) 1.65, 95% confidence interval (CI) −4.83 to 8.12, 2 RCTs, 6 months follow-up); distress (MD 0.0, 95% CI −0.36 to 0.36, 1 RCT, 3 months follow-up); or care needs (MD 2.32, 95% CI −7.49 to 12.14, 2 RCTs, 3 months follow-up). However, these studies all evaluated one specific screening intervention (CONNECT) in people with colorectal cancer. In the studies where some effects could be identified, no recurring relationships were found between intervention characteristics and the effectiveness of screening interventions. We found low-certainty evidence that does not support the effectiveness of screening of psychosocial well-being and care needs in people with cancer. Studies were heterogeneous in population, intervention, and outcome assessment. The results of this review suggest a need for more uniformity in outcomes and reporting; for the use of intervention description guidelines; for further improvement of methodological certainty in studies and for combining subjective patient-reported outcomes with objective outcomes.

Plain-language summary: We found 26 studies including a total of 7654 adults with cancer. Most studies included both males and females. With regard to cancer type, most studies included people with a specific type of cancer, but some included a variety of cancer types. Furthermore, the type of screening differed: half of the studies asked participants to self-complete a screening questionnaire about their psychosocial health, while in the remaining studies screening interviews were conducted in which a healthcare professional questioned participants about their well-being face-to-face. Several studies showed benefits of screening on psychosocial well-being of cancer patients, such as their health-related quality of life, distress, care needs, and patient satisfaction. However, some studies also found negative effects. There were important differences between the studies: they assessed different psychosocial aspects (e.g. health-related quality of life, distress, care needs, and patient satisfaction) and differed in their modes of screening (i.e. self-report screening questionnaire versus screening interview), timing and frequency of the screening (1 to 12 times), outcome measures, and outcome time points. Due to these differences, only three studies studying the same intervention could be included in the analysis. Our results do not support the screening of psychosocial well-being and care needs in people with cancer. The certainty of the evidence was low, which means that we are uncertain about the results of the review due to variations in characteristics, and results of the studies and study designs.