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While patients with ovarian cancer often show positive responses to treatment, it is common for the cancer to reappear and develop resistance to treatment, so it is important to explore and create novel combinations to increase patient survival rates. ATRi\u2019s (Ataxia telangiectasia and Rad3-related inhibitors) and ONC201 monotherapies have shown efficacy in ovarian cancer in preclinical models. We hypothesized that combining ATRi\u2019s with ONC201 would enhance this efficacy. ONC201 induces apoptosis through the TRAIL-pathway following activation of the integrated stress response and inactivation of Akt which is upregulated in ovarian cancer. Six human ovarian cancer cell lines were treated alone and with the novel drug combination of ceralasertib (ATRi) and ONC201. We found an IC50 range of 0.88-20.16 \u03bcM for ONC201 and IC50 range of 0.55-54.75 \u03bcM for ceralasertib. The combination of ONC201 plus ceralasertib resulted in PARP cleavage consistent with apoptosis along with reduction in Bcl-XL, Xiap and p-Akt expression after 72 hours of treatment. Cytokine profiling showed a decrease in markers of inflammation and tumor progression. Our data provide evidence of synergy from the combination of ATRi ceralasertib and ONC201 against Ovarian cancer cells that merits further investigation including clinical translation.<\/jats:p>","DOI":"10.64898\/2026.09.23.753805","type":"posted-content","created":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T13:10:14Z","timestamp":1790255414000},"source":"Crossref","is-referenced-by-count":0,"title":["ONC201 in combination with ATR inhibitor ceralasertib exhibits potent synergy in ovarian cancer cells"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1651-7058","authenticated-orcid":false,"given":"Maryam","family":"Ghandali","sequence":"first","affiliation":[{"name":"Laboratory of Translational Oncology and Translational Cancer Therapeutics, Warren Alpert Medical School of Brown University, Providence, RI"},{"name":"Legorreta Cancer Center, Brown University, Providence, RI"},{"name":"Joint Program in Cancer Biology, Brown University and Lifespan Cancer 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