UT-34

UT-34 is a potent, selective and orally bioavailable second-generation androgen receptor (AR) pan antagonist and degrader with IC50 of 203.46 nM, 80.78 nM and 94.17 nM for wild-type, T877A and W741L AR, respectively. UT-34 is a potential next-generation therapeutic for enzalutamide-resistant prostate cancer.

UT-34 inhibits the wild-type and LBD-mutant ARs comparably and inhibits the in vitro proliferation. UT-34 promotes a conformation that is distinct from the LBD-binding competitive antagonist enzalutamide and degrades the AR through the ubiquitin proteasome mechanism. UT-34 has a broad safety margin and exhibits no cross-reactivity with Gprotein-coupled receptor kinase and nuclear receptor family members.[1]

UT-34 inhibits the wild-type and LBD-mutant ARs comparably and inhibits the in vivo growth of enzalutamide-sensitive and -resistant prostate cancer xenografts. In preclinical models, UT-34 induces the regression of enzalutamide-resistant tumors at doses when the AR is degraded; but, at lower doses, when the AR is just antagonized, it inhibits, without shrinking, the tumors.[1]

[1] Suriyan Ponnusamy, et al. Clin Cancer Res. 2019 Nov 15;25(22):6764-6780.