Complete remission sustained 3 years from treatment initiation is a powerful surrogate for extended survival in multiple myeloma

Abstract

Background: Complete response (CR) has been considered a necessary although not sufficient early clinical endpoint for extended survival in multiple myeloma.

Methods: By using Total Therapy 2 (TT2) clinical outcome data in 668 patients, whether sustained CR (SUS-CR) was potentially a superior surrogate for survival than attaining CR status per se was evaluated.

Results: Compared with not achieving CR (NON-CR) and especially achieving and subsequently losing CR status (LOS-CR) within a 3-year landmark from treatment initiation, SUS-CR was associated with highly superior postlandmark survival (P < .0001). These results were validated in 231 untreated patients enrolled in the predecessor trial, TT1 (hazard ratio [HR] = 0.54, P = .013) and in 1103 previously treated patients on other transplant protocols (HR = 0.49; P < .001).

Conclusions: In all 3 trial settings the survival benefit of SUS-CR was independent of metaphase abnormalities as a dominant adverse parameter. Given its bleak prognosis despite high CR rates, SUS-CR should be evaluated as a primary trial endpoint in high-risk myeloma.