Background The association between progression type and survival has been reported in breast cancer, but remains unclear in advanced gastric cancer (AGC). Here, this association was assessed using data obtained from an earlier randomized phase III study demonstrating the non-inferiority of S-1 plus oxaliplatin (SOX) to S-1 plus cisplatin (CS) on progression-free survival and overall survival (OS) in the first-line treatment of AGC. Methods A Cox regression model including two time-dependent covariates, progression with new lesions and with no new lesions, was used to determine their effect on OS in each treatment group. When both types of progression were detected simultaneously, this was categorized as progression with new lesions.
123Gastric Cancer (2017) 20:640-645 DOI 10.1007 Results