BET protein inhibition is a promising therapeutic target complementing JAK inhibition by co-targeting inflammatory pathways, fibrosis, and clonal proliferation. Pelabresib is a pan-BETi furthest in development demonstrating clinical benefit with ongoing trials. Research into novel pan-and selective-BETis both as monotherapy and in combination with JAKis or other mechanism-based therapies are ongoing. Whether BETi therapy in MF will ultimately deliver substantial anti-clonal activity to modify disease biology and meaningfully impact clinical outcomes is yet to be determined.
Beygui et al. (2026) studied this question.