Diverse Drug Combinations with an Eed Inhibitor Confer Context-Specific Benefit across Multiple Tumor Types (ASH 2021)
Combination activity is also observed with the EED inhibitor in combination with the BTK inhibitor, acalabrutinib, in DLBCL, although this appears to be context dependent...In SCLC, the EED inhibitor increased expression of SLFN11, a biomarker that has been linked to clinical response to a PARP inhibitor / temozolomide combination (Pietanza et al., 2018). Therefore, we evaluated the EED inhibitor in combination with the PARP inhibitor, olaparib, in an aggressive SCLC xenograft model and observed reduced tumor growth in the combination arm but not in monotherapy arms. In ovarian cancer, ARID1A mutations are proposed to sensitize to EZH2 and ATR inhibitors (Bitler et al., 2015, Williamson et al., 2016) which prompted evaluation of the EED inhibitor with the ATR inhibitor, AZD6738...Interestingly, we find that EEDi has significant anti-tumor activity alone, as compared with either control or CTLA4 antibody treatment alone. Together, these data show that while our EEDi has strong single-agent activity in vitro and in vivo, combining the EEDi together with inhibitors of select oncogenic pathways may bring deeper therapeutic response in a context dependent manner.