June 6, 2016
VB-111 Clinical Data Presented at ASCO Demonstrate Significant Increase in Overall Survival in Platinum-Resistant Ovarian Cancer
Press Release | VBL Therapeutics
TEL AVIV, Israel, June 06, 2016 (GLOBE NEWSWIRE) — VBL Therapeutics (Nasdaq:VBLT), a clinical-stage biotechnology company focused on the discovery, development and commercialization of first-in-class treatments for cancer, today announced the presentation of updated clinical results from a Phase 1/2 trial of VB-111 in the treatment of patients with recurrent platinum resistant ovarian cancer. The data are being presented today in a poster at the 2016 American Society of Clinical Oncology (ASCO) annual meeting, in Chicago. They demonstrate a median overall survival of 810 days in the VB-111 therapeutic dose arm, versus 172 days in the low dose arm, a result that was statistically significant. There was also a durable doubling in the response rate, as measured by a reduction in the CA-125 biomarker, compared to historical rates of Avastin plus chemotherapy in ovarian cancer. Durable RECIST responses and disease stabilizations were also observed.
“The demonstration of improved overall survival with the therapeutic dose, in combination with 60% durable response rate, is particularly impressive, given this trial focused on women with poor prognosis disease,” said Richard Penson, MD, MRCP, Associate Professor of Medicine, Harvard Medical School, Clinical Director of Medical Gynecologic Oncology, Massachusetts General Hospital, and Primary Investigator for this trial.
“We are excited by this data set from our Phase 1/2 ovarian cancer trial which show durable disease control and responses with VB-111,” said Dror Harats, MD, Chief Executive Officer of VBL Therapeutics. “The data reinforce our confidence in VB-111 as, together with the positive data we have generated in GBM, this is the second cancer indication in which we have observed a significant survival benefit. We are now preparing for an end-of-Phase 2 meeting with the FDA which will guide the next steps in our ovarian cancer clinical program.”
This trial was designed as a Phase 1/2 dose escalation study. The primary objectives were to evaluate the safety and tolerability and identify dose limiting toxicity in combination of VB-111 and weekly paclitaxel; and explore the efficacy in an expanded cohort of the optimally tolerated dose of combination VB-111 and weekly paclitaxel, based on RECIST response, CA-125 response, progression free survival (PFS) and overall survival (OS) in patients with recurrent platinum-resistant ovarian cancer.
Twenty one patients with recurrent platinum-resistant Müllerian/ovarian cancer were enrolled at Massachusetts General Hospital and Dana Farber Cancer Institute, and received up to 7 doses of treatment. Patients were treated in two consecutive cohorts: Low Dose Treatment (n=4, 3×1012 VPs + 40mg/80 paclitaxel) or a Therapeutic Dose (n=17, 1×1013 VPs + 80 paclitaxel). All patients had measurable disease, with a grade at diagnosis of: 1A (1, 5%), 1B (1, 5%), 1C (1, 5%); IIIC (12, 57%); or IV (6, 29%). The patients included in the study were of particularly adverse prognosis as 48% of the patients were primary platinum refractory and 52% had tumors that failed to respond to prior anti-angiogenic agents, including Avastin®.
The results showed a significant increase in overall survival at the therapeutic dose of VB-111 vs. the low dose level (810 vs. 172 days, p=0.042). Nine of the 15 evaluable patients (60%) on the therapeutic dose had a response, as defined by a 50% reduction in CA-125. Durable RECIST responses and disease stabilizations were seen. This represents an approximate doubling in response rate, compared to historical data with ovarian cancer patients treated with a combination of Avastin® and chemotherapy in the AURELIA1 trial.
An immunotherapeutic effect was also observed in biopsies taken from patients. H&E and immunohistochemistry staining showed regions of apoptotic cancer cells and infiltration of cytotoxic CD8 T-cells following treatment with VB-111.
VB-111 was found to be safe and well tolerated. Toxicity was similar to what would be expected with antiangiogenics and taxanes in this patient population. Eight serious adverse events were reported, 2 were considered by the investigator to be possibly related to be VB-111. No dose limiting toxicities were reported at any dose level.
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