Short-term and long-term effects of Sanming healthcare system reform on drug-related expenditures for rural patients with cancer in public hospitals: an interrupted time series analysis using segmented regression model in China.

'Sanming model' had long-term effect in reducing total drug expenditures, drug ratio and drug expenditures covered by NRCMS for rural inpatients with cancer and only short-term positive effect for outpatients. However, there was limited effect of 'Sanming model' on drug expenditures uncovered by NRCMS. 'Sanming model' still needs to accumulate experiences and improves the reform measures dynamically.