Abstract LB-265: The novel oral Chk1 inhibitor, SRA737, is active in both PARP inhibitor resistant andCCNE1amplified high grade serous ovarian cancers

High grade serous ovarian cancers (HGSOC) have defective homologous recombination (HR) genes in 50% of cases, while a distinct 20% demonstrate CCNE1 amplification ( CCNE1 amp ). HR-deficient HGSOC are initially sensitive to Poly(ADP-ribose) polymerase inhibitors (PARPi) but drug resistance ultimately emerges. CCNE1 amp HGSOC show resistance to PARPi and platinum treatments. Here, we investigated the anti-tumor activity of the potent, highly selective, orally bioavailable small molecule inhibitor of Checkpoint kinase 1 (Chk1), SRA737, in both acquired PARPi-resistant and CCNE1 amp HGSOC models. HR-deficiencies and CCNE1 amp are known to increase replication stress, leading to increased reliance on Chk1, a key regulator of cell cycle progression and the replication stressresponse. We hypothesized that Chk1 inhibition by SRA737 will result in increased replication stress, inducing subsequent cell death and tumor regression in both PARPi-resistant and CCNE1 amp ovarian cancer models. In colony formation assays, SRA737 monotherapy decreased cell survival in HR-deficient, PARPi-resistant and CCNE1 amp cells. Additionally, the combination of SRA737 with PARPi was synergistic in decreasing colony formation in HR-deficient (PEO1, best coefficient of drug interaction (CDI)=0.53; JHOS4, CDI=0.45) and PARPi-resistant cell models (PEO1-PR, CDI=0.11; PEO4, CDI=0.08). SRA737 treatment led to a dose-dependent increase in the replication stressmarker pCHK1 (S345), confirming an on-target drug effect in PARPi-resistant (PEO1-PR) and CCNE1 amp (OVCAR3) cells. Furthermore, treatment with SRA737 induced gH2AX (indicator of DNA damage) which increased modestly in combination with PARPi. SRA737 was also evaluated in a PARPi-resistant PDX model as well as in CCNE1 amp in vivo mouse models. Preliminary evidence in a PARPi resistant PDX model demonstrated tumor growth inhibitory activity of SRA737 in combination with PARPi. Consistent with in vitro activity, SRA737 inhibited tumor growth in an OVCAR3 xenograft model. Lastly, in an orthotopic PDX model established from a platinum-resistant CCNE1 amp ovarian cancer patient, SRA737 monotherapy caused significant tumor regression, similar to SRA737 in combination with PARPi. Strategies to optimize treatments for PARPi-resistant HGSOC, as well as for platinum-resistant CCNE1 amp HGSOC, are needed. In PARPi-resistant models, SRA737 is active as a monotherapy, and the combination of SRA737 with PARPi demonstrated synergy. In CCNE1 amp tumors, SRA737 showed profound activity as a monotherapy in this PARPi-resistant model. SRA737 is a new potent and selective Chk1 inhibitor that demonstrated activity in acquired PARPi-resistant as well as CCNE1 amp preclinical cancer models, warranting further development in these HGSOC subgroups. Citation Format: Haineng Xu, Sergey Medvedev, Ashka Pandya, Hyoung Kim, Yasuto Kinose, Eric Brown, Ryan J. Hansen, Bryan Strouse, Snezana Milutinovic, Christian Hassig, Fiona Simpkins. The novel oral Chk1 inhibitor, SRA737, is active in both PARP inhibitorresistant and CCNE1 amplified high grade serous ovarian cancers [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2018; 2018 Apr 14-18; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2018;78(13 Suppl):Abstract nr LB-265.