Background: A Phase I trial (NCT01116648) of cediranib (cedi) in combination with olaparib (ola) (cedi + ola) demonstrated an overall response rate of 44% in patients (pts) with recurrent ovarian cancer (OC), including pts without a deleterious or suspected deleterious gBRCAm (non-gBRCAm; Liu et al. Eur J Cancer 2013). The subsequent Phase II trial (NCT01116648) showed significant improvement in progression-free survival (PFS) with cedi + ola versus ola monotherapy in recurrent platinum-sensitive OC pts, notably in non-gBRCAm pts (Liu et al. Lancet Oncol 2014). We report data from the Phase IIb, single-arm, open-label CONCERTO study investigating cedi + ola in non-gBRCAm pts with recurrent platinum-resistant OC who had received ≥3 previous lines of therapy for advanced OC (NCT02889900). Methods: Pts with disease progression <6 months from the last receipt of platinum-based chemotherapy received cedi tablets (30 mg once daily) plus ola tablets (200 mg twice daily) until progression or unacceptable toxicity. gBRCAm pts were ineligible. Primary endpoint: objective response rate (ORR) by independent central review (ICR; RECIST 1.1). Key secondary endpoints: PFS and safety. Results: 60 pts from the USA were included (median age: 64.5 years; median number of previous systemic treatment regimens: 4 [range: 2–9]; previous bevacizumab: 53). All pts had high-grade OC (90% serous; 3.3% clear cell; 3.3% endometrioid; 3.3% other). 7% of pts had tumor BRCA2 (confirmed somatic) mutations, 80% of pts had no tumor BRCA mutation (non-tBRCAm) and 13% of pts were not evaluable for tBRCAm. Five (8%) pts who were non-tBRCAm carried somatic homologous recombination repair gene mutations (FoundationOne Clinical Trial Assay, Foundation Medicine, Inc). The Table shows results of key endpoints. Most common grade ≥3 adverse events (AEs) that occurred in pts were hypertension (30%), fatigue (22%) and diarrhea (13%). 37% of pts reported serious AEs, of which nausea (7%) was most common. Dose interruptions, reductions and discontinuations were caused by AEs in 55%, 18% and 18% of pts, respectively, who received cedi + ola. Conclusions: Cedi + ola showed evidence of antitumor activity in heavily pretreated non-gBRCAm pts with recurrent platinum-resistant OC. Toxicity was manageable with dose modifications. Clinical trial information: NCT02889900

*By ICR; ^†n=59; ^‡n=9