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Lurbinectedin Does Not Improve PFS in Platinum-Resistant Ovarian Cancer

Wayne Kuznar
Published: Monday, Nov 12, 2018

Stephanie Gaillard, MD

Stephanie Gaillard, MD

Results of the phase III CORAIL trial demonstrated that the marine-derived treatment lurbinectedin did not improve progression-free survival (PFS) compared with pegylated liposomal doxorubicin (PLD) or topotecan in patients with platinum-resistant ovarian cancer.1

“The primary endpoint, an improvement in PFS with lurbinectedin, was not met,” said lead investigator Stephanie Gaillard, MD, during a presentation at the 2018 ESMO Congress. “Other efficacy measures, such as response rate and overall survival (OS), were not improved with lurbinectedin.”

Lurbinectedin blocks transcriptional transactivation. Its mechanism involves the specific degradation of RNA polymerase II by the ubiquitin-proteasome machinery and the subsequent accumulation of DNA breaks and apoptosis as downstream events.

“Lurbinectedin also reduces the level of tumor-associated macrophages and the inflammatory tumor microenvironment,” said Gaillard, assistant professor of oncology, Johns Hopkins University. “Preclinical data have shown strong single-agent lurbinectedin antitumor activity in cisplatin-resistant epithelial ovarian cancer models.”2

In a phase II trial of lurbinectedin in platinum-resistant/refractory ovarian cancer, the objective response rate with lurbinectedin per RECIST or GCIG criteria was 30% and the median PFS was 5.0 months in the subgroup of patients with platinum resistance.3 The results in the platinum-resistant cohort were the basis of the CORAIL study.

The data presented at the 2018 ESMO Congress were from a study of 442 patients with platinum-resistant ovarian, fallopian, or primary peritoneal cancer. Eligible patients had an ECOG performance score of 0 to 2 and received treatment with ≤3 lines of prior chemotherapy. They were randomized 1:1 to lurbinectedin at 3.2 mg/m2 every 3 weeks (arm A) or investigator choice of PLD at 50 mg/m2 every 4 weeks or topotecan at 1.5 mg/m2 on days 1 to 5 every 3 weeks (arm B) until progression or discontinuation due to toxicity.

The primary endpoint was a 30% reduction in the relative risk of progression or death.

Baseline characteristics were well balanced. Median age was 63 years in arm A and 59 years in arm B. The primary cancer site was ovarian in 89% and 88%, respectively, and histology type was serous/papillary in 82% and 90%. Six patients in arm A and 5 in arm B had a germline BRCA mutation. The median number of prior lines of chemotherapy was 2 in each arm; 41% in arm A and 46% in arm B received prior bevacizumab (Avastin). The median platinum-free interval was 3.9 and 3.6 months in arms A and B, respectively.

The median PFS according to independent review committee (IRC) was 3.5 months in the lurbinectedin recipients and 3.6 months in arm B, corresponding to a hazard ratio of 1.043 (95% CI, 0.842-1.293; P = .6951), failing to meet the primary endpoint. Median PFS in arm was 3.6 months each in patients who received PLD or topotecan. PFS according to investigator assessment was 3.7 months in both arm A and arm B.

Median OS, which was a secondary endpoint, was likewise not different between the 2 arms at the time of data cutoff in October 2017. Median OS was 11.2 months in patients randomized to lurbinectedin compared with 11.1 months in those randomized to either PLD or topotecan (HR, 0.97; P = .8038). Separated by investigator choice, the median OS was 11.3 months and 10.2 months in the PLD and topotecan arms, respectively.

The ORR was 14.0% in arm A, which consisted of 3 complete responses (CRs), 28 partial responses (PRs), and 91 cases of stable disease (SD). In arm B, there were 3 CRs and 24 PRs, for an ORR of 12.2%, and 98 patients had SD. The median duration of response was 4.4 months in the lurbinectedin arm versus 3.7 months in the PLD/topotecan arm.

In patients with primary platinum resistance, the ORRs by IRC were 13.5% in arm A and 11.1% in arm B (P = .6874). In patients with secondary platinum resistance, the ORRs were 14.5% and 13.5% (P = .8463), respectively. The PFS was 3.1 months and 3.5 months in arm A and arm B (P = .3223), respectively, in patients with primary platinum resistance, and 3.7 months in each arm (P = .6820) in patients with secondary platinum resistance. Median OS was 9.2 months for arm A and 8.8 months for arm B in those with primary resistance; in those with secondary resistance, the median OS in arms A and B were 14.5 and 11.8 months.

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