You are comparing the wrong numbers, 5 year-OS vs objective response. Objective response is 46% in the study you cited (Table 2). 5 year-OS is nearly always low

You are comparing the wrong numbers, 5 year-OS vs objective response. Objective response is 46% in the study you cited (Table 2). 5 year-OS is nearly always lower. The patients in the new study were only followed for a median of 6.8 months, and unfortunately, the odds are high that not all of them will survive that long.