Extending breast cancer screening beyond age 45-64 years in China: a cost-effectiveness analysis.

The optimal breast cancer (BC) screening age in China remains uncertain. In this study, we evaluated the benefits, harms, and cost-effectiveness of lowering the screening starting age from 45 to 35 years and extending the stopping age from 64 to 79 years in Chinese women at an average risk of progressing BC. Biennial screening showed a lower incremental cost-effectiveness ratio (ICER) compared to annual screening. Extending the screening age beyond 45-64 years in certain scenarios increased the number of false-positive results and each averted breast cancer deaths. Specifically, extending the starting age to 35 years reduced overdiagnosis rates to10.8% and had an incremental cost ratio of US$12,746 per quality-adjusted life year (QALY), falling below the cost-effectiveness threshold of US$18,346 per QALY. Regarding the ceasing age, the status quo (age 64 years) was found to be the optimal choice as it was proved to yield the majority of benefits with reduced harm and be the only option under the cost-effectiveness threshold. In summary, biennial screening for average-risk women aged 35-64 years is the most cost-effective approach, aligning with The National Health Commission's screening program for cervical and breast cancer.