Clovis Oncology, Inc. (NASDAQ: CLVS) today announced that four abstracts featuring data from clinical studies evaluating Rubraca and/or lucitanib and one abstract on real world data of PARP inhibitor usage, will be presented during the 2021 American Society of Clinical Oncology (ASCO) Annual Meeting to be held virtually, June 4-8, 2021.

"We remain committed to understanding how Rubraca and lucitanib may benefit patients with cancer, and the data presented at ASCO further enhance our understanding of their potential benefit in different patient populations and solid tumor types," said Patrick J. Mahaffy, President and CEO of Clovis Oncology.

The following Clovis-sponsored full abstracts are available as of May 19 at 5:00 pm ET on ASCO's Meeting Library. 

Rubraca

Abstract #5517: Subgroup Analysis of Rucaparib Versus Chemotherapy as Treatment for BRCA-mutated, Advanced, Relapsed Ovarian Carcinoma: Effect of Platinum Sensitivity in the Randomized, Phase 3 Study ARIEL4

• Lead Author: Amit M. Oza, MD, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada

• Poster Discussion Session: Gynecologic Cancer

• Date/Time: June 4 at 9:00 am ET

• Key Takeaways: Results from this exploratory subgroup analysis of the Phase 3 ARIEL4 trial demonstrate that patients treated with Rubraca had comparable or longer PFS vs. standard-of-care platinum-chemotherapy across all platinum status subgroups. Safety profiles for Rubraca and chemotherapy across the subgroups were consistent with known safety profiles of these agents. These results suggest that Rubraca is an effective treatment option for heavily pretreated patients with BRCA-mutated, advanced, relapsed ovarian cancer as compared to chemotherapy, regardless of their sensitivity to platinum-based therapy.

Abstract #5537: Clinical and Molecular Characteristics of ARIEL3 Patients Who Derived Exceptional Benefit from Rucaparib Maintenance Treatment for High-grade Ovarian Cancer (HGOC)

• Lead Author: Tanya Kwan, PhD, Clovis Oncology, Inc., Boulder, Colorado, USA

• Poster Session: Gynecologic Cancer

• Date/Time: June 4 at 9:00 am ET

• Key Takeaways: In the Phase 3 ARIEL3 trial, exceptional benefit (progression-free survival ≥2 years) was more common in, but not exclusive to, patients with favorable clinical characteristics and known mechanisms of PARP inhibitor sensitivity, including mutations of BRCA1/2 and RAD51C/D. These results suggest that rucaparib can deliver exceptional benefit to a diverse set of patients with high-grade ovarian cancer. In all, 21% (79/375) of patients in the rucaparib arm derived exceptional benefit versus only 2% (4/189) in the placebo arm of the trial. Among rucaparib-treated patients, incidence rates of the most common TEAEs were generally consistent between the exceptional benefit subgroup and the overall ARIEL3 patient population.

Rubraca in Combination with Lucitanib

Abstract #3102: Phase 1b/2 SEASTAR Trial: Safety, Pharmacokinetics, and Preliminary Efficacy of the Poly(ADP-ribose) Polymerase (PARP) Inhibitor Rucaparib and Angiogenesis Inhibitor Lucitanib in Patients with Advanced Solid Tumors

• Lead Author: Ecaterina E. Dumbrava, MD, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA

• Poster Session: Developmental Therapeutics - Molecularly Targeted Agents and Tumor Biology

• Date/Time: June 4 at 9:00 am ET

• Key Takeaways: Initial findings suggest that rucaparib plus lucitanib has an acceptable safety profile, and there was some evidence of effect on tumor and disease stabilization among patients with measurable disease, with a 23.5% disease control rate. A maximum tolerated dose for the combination was not established, and no drug-drug interactions were observed. These data suggest the combination of a PARP inhibitor and an angiogenesis inhibitor is feasible and may merit further evaluation.

Lucitanib in Combination with Nivolumab

Abstract #5538: LIO-1: Lucitanib + Nivolumab in Patients with Advanced Solid Tumors—Updated Phase 1b Results and Initial Experience in Phase 2 Ovarian Cancer Cohort

• Lead Author: Erika Hamilton, MD, Sarah Cannon Research Institute/Tennessee Oncology, Nashville, Tennessee, USA

• Poster Session: Gynecologic Cancer

• Date/Time: June 4 at 9:00 am ET

• Key Takeaways: Data from the Phase 1b LIO-1 trial identified the Phase 2 starting dose of the combination and updated Phase 1b efficacy data suggest that lucitanib plus nivolumab has promising antitumor activity (47.1% disease control rate) with a manageable safety profile in patients with advanced solid tumors with no satisfactory treatment options. The Phase 2 study is currently assessing four cohorts of patients with advanced gynecologic malignancies. Interim results from one of these, non-clear cell ovarian cancer (OC) are reported here. 70.8% of patients had received at least 3 previous therapy lines, and 29.2% had primary platinum resistant disease. In 22 evaluable patients, the disease control rate was 31.8% including one confirmed PR. The safety profile of the combination was consistent with that reported in the Phase 1b portion of the study. In addition, the data support the individualized lucitanib dose-titration strategy. While evidence of clinical activity has been observed, Clovis does not believe that the interim efficacy data support further development in non-clear cell OC. Enrollment to the other cohorts continues.

HEOR

Abstract #e18702: Real-world Data Analysis of the Utilization of Second-Line Maintenance Therapy for Patients with Advanced Ovarian Cancer

• Lead Author: Robert Reid, MD, FACP, US Oncology, Virginia Cancer Specialists, Fairfax, Virginia, USA

• Accessible as e-publication only

• Key Takeaways: Real world data from the iKnowMed electronic database of the US Oncology Network (including >470 sites) found that fewer than half of eligible ovarian cancer patients receive second-line maintenance treatment, despite treatment guidelines recommending its usage. In addition, the proportion of patients receiving 2L PARPi maintenance increased from 17% in 2018 to 34% in 2019 but decreased to 22% in 2020.

About Rubraca (rucaparib)

Rucaparib is an oral, small molecule inhibitor of PARP1, PARP2 and PARP3 being developed in multiple tumor types, including ovarian and metastatic castration-resistant prostate cancers, as monotherapy, and in combination with other anti-cancer agents. Exploratory studies in other tumor types are also underway.

Rubraca is an unlicensed medical product outside of the U.S. and Europe.

Rubraca Ovarian Cancer U.S. FDA Approved Indications

Rubraca is indicated for the maintenance treatment of adult women with recurrent epithelial ovarian, fallopian tube, or primary peritoneal cancer who are in a complete or partial response to platinum-based chemotherapy.

Rubraca is indicated for the treatment of adult women with a deleterious BRCA mutation (germline and/or somatic)-associated epithelial ovarian, fallopian tube, or primary peritoneal cancer who have been treated with two or more chemotherapies. Select patients for therapy based on an FDA-approved companion diagnostic for Rubraca.

Select Important Safety Information

Myelodysplastic Syndrome (MDS)/Acute Myeloid Leukemia (AML) have occurred in patients treated with Rubraca, and are potentially fatal adverse reactions. In 1146 treated patients, MDS/AML occurred in 20 patients (1.7%), including those in long term follow-up. Of these, 8 occurred during treatment or during the 28 day safety follow-up (0.7%). The duration of Rubraca treatment prior to the diagnosis of MDS/AML ranged from 1 month to approximately 53 months. The cases were typical of secondary MDS/cancer therapy-related AML; in all cases, patients had received previous platinum-containing regimens and/or other DNA damaging agents.

Do not start Rubraca until patients have recovered from hematological toxicity caused by previous chemotherapy (≤ Grade 1). Monitor complete blood counts for cytopenia at baseline and monthly thereafter for clinically significant changes during treatment. For prolonged hematological toxicities (> 4 weeks), interrupt Rubraca or reduce dose and monitor blood counts weekly until recovery. If the levels have not recovered to Grade 1 or less after 4 weeks or if MDS/AML is suspected, refer the patient to a hematologist for further investigations, including bone marrow analysis and blood sample for cytogenetics. If MDS/AML is confirmed, discontinue Rubraca.

Based on its mechanism of action and findings from animal studies, Rubraca can cause fetal harm when administered to a pregnant woman. Apprise pregnant women of the potential risk to a fetus. Advise females of reproductive potential to use effective contraception during treatment and for 6 months following the last dose of Rubraca.

Most common adverse reactions in ARIEL3 (≥ 20%; Grade 1-4) were nausea (76%), fatigue/asthenia (73%), abdominal pain/distention (46%), rash (43%), dysgeusia (40%), anemia (39%), AST/ALT elevation (38%), constipation (37%), vomiting (37%), diarrhea (32%), thrombocytopenia (29%), nasopharyngitis/upper respiratory tract infection (29%), stomatitis (28%), decreased appetite (23%), and neutropenia (20%).

Most common adverse reactions in Study 10 and ARIEL2 (≥ 20%; Grade 1-4) were nausea (77%), asthenia/fatigue (77%), vomiting (46%), anemia (44%), constipation (40%), dysgeusia (39%), decreased appetite (39%), diarrhea (34%), abdominal pain (32%), dyspnea (21%), and thrombocytopenia (21%).

Co-administration of rucaparib can increase the systemic exposure of CYP1A2, CYP3A, CYP2C9, or CYP2C19 substrates, which may increase the risk of toxicities of these drugs. Adjust dosage of CYP1A2, CYP3A, CYP2C9, or CYP2C19 substrates, if clinically indicated. If co-administration with warfarin (a CYP2C9 substrate) cannot be avoided, consider increasing frequency of international normalized ratio (INR) monitoring.

Because of the potential for serious adverse reactions in breast-fed children from Rubraca, advise lactating women not to breastfeed during treatment with Rubraca and for 2 weeks after the last dose.