Notably, marked peripheral CD8+ T cell expansion was observed at the onset of response, and counts remained elevated during sustained remission. This case suggests that early sFLC reduction is a useful indicator for treatment continuation, and that peripheral CD8+ T-cell dynamics may serve as an on-treatment response biomarker for elranatamab therapy.
JTT may enhance the efficacy of T cell-redirecting immunotherapies in RRMM by promoting cytotoxic T cell expansion. These findings warrant further investigation into the use of JTT as an adjunct to improve outcomes in patients with EMD.