乳がん患者における経済的負担：系統的レビューとメタアナリシス

Financial toxicity (FT) refers to the negative effects of the economic burden of medical care on patients that potentially lead to poor well-being and quality of life. Individuals with breast cancer are especially prone to high out-of-pocket costs (OOPCs). We aimed to evaluate the FT rate of individuals with breast cancer and determine particularly vulnerable patients.

A comprehensive search of PubMed/Medline, Embase, Global Index Medicus, Web of Science (WOS), and EBSCO was performed from inception to July 28, 2025. Studies on FT in participants with breast cancer were included. Pooled estimates of FT rates with 95% confidence intervals (CIs) were calculated using the random-effects model. The primary outcome was FT. The secondary outcomes included the rates of participants in high-income countries (HICs), middle-income, and low-income countries (LMICs) who incurred FT based on income, OOPCs, or patient-reported impact of expenditures during diagnosis and treatment of breast cancer.

66 studies involving 29426 participants with breast cancer were enrolled in our study. Most studies were from HICs (46 studies), and the others were from LMICs (20 studies). The definition of FT was significant difference among these studies. The pooled FT rate was 39.3% (95% CI, 32.4%-46.6%) in HICs and 72.3% (95% CI, 56.8%-83.8%) in LMICs.

FT is a substantial burden among patients with breast cancer worldwide. While the burden of FT is still disproportionately higher in LMICs, nearly 40% of patients in HICs also experienced FT. However, the gap between the two settings may be narrowing.