Digital Health Supportive Care Interventions for Breast Cancer Survivors: An Umbrella Review of Systematic Reviews and Meta-Analyses

Background/Objectives: Digital health interventions are a common form of supportive care for breast cancer survivors and may improve quality of life (QoL), physical activity and psychosocial outcomes, yet the evidence is fragmented across many systematic reviews. This umbrella review synthesised systematic reviews and meta-analyses of digital health interventions for breast cancer survivors to characterise their modalities, effectiveness and readiness for real-world implementation. Methods: Following a prospectively registered protocol (PROSPERO CRD420251185022), six databases were searched from inception to July 2025 for systematic reviews or meta-analyses evaluating any digital health intervention in adult breast cancer survivors and reporting QoL, physical or psychosocial outcomes. Methodological quality was appraised with AMSTAR-2, certainty of evidence with GRADE, overlap of primary studies with the corrected covered area (CCA), and findings were synthesised narratively. Results: Twenty-three systematic reviews were included, encompassing 459 primary study occurrences (333 unique studies; CCA 1.7%, slight overlap) and 44,560 participants across the 15 reviews that reported sample sizes. Interventions comprised online programmes, mobile applications (mHealth), telephone-based interventions, wearable activity trackers, virtual reality and an artificial intelligence chatbot. Across the included reviews, digital health interventions generally demonstrated favourable effects on QoL, physical activity, and psychosocial outcomes, although findings varied across intervention modalities and individual outcomes. Methodological confidence was low in 19 of 23 reviews (83%), limiting the robustness of these findings. Engagement or adherence was reported by 83% of reviews, but economic data (13%), equity considerations (35%) and health-system integration (43%) were rarely addressed. Conclusions: Digital health interventions show promise as supportive care tools for breast cancer survivors, particularly for improving QoL, physical activity, and psychosocial well-being. However, methodological limitations and evidence gaps regarding long-term engagement and cost-effectiveness persist. Future work should evaluate their integration into survivorship pathways, report engagement as standard, and generate the implementation and economic evidence that integration requires.