- @biorxivpreprint.bsky.social NKTR-255 is a polymer-conjugated IL-15 with extended half-life that can boost endogenous T and NK cells, as well as CD19 CAR-T activity in B cell malignancies @sriv4000.bsky.social @fredhutch.org www.biorxiv.org/content/10.6...Dec 16, 2025 04:33