In mid-2016, we had the final evaluation of the phase 2 study of MESA with sandwiched radiotherapy in newly diagnosed early stage NKTCL (NCT02825147). We obtained the final overall response rate of MESA with sandwiched radiotherapy, while the 2-year progression free survival rate was not available at that timepoint. To make the study design of sample size more accurate, we changed the primary outcome endpoint from 2-year progression free survival rate to overall response rate. The change had been approved by the Ethics Committee in August 10, 2016. At that time, only fourteen patients were enrolled in NCT02631239.
