Duration of i-response (iDOR).

iDOR is defined as the time from the date of the first response iCR/iPR (whichever is first recorded) to the date of PD (iUPD confirmed as iCPD.  iDOR is only defined for subjects who have best overall response of iCR or iPR.  If a patient has  iPR (#1) followed by a iUPD (#1) which is not confirmed, then a iPR (#2) followed by a iUPD  (#2) which is confirmed at the next assessment, then the iDOR is from iPR1 › iUPD2.