TPIV 200 and durvalumab to be evaluated in a Phase II ovarian cancer study

TapImmune plans to initiate a Phase II trial of its cancer vaccine, TPIV 200, a multi-epitope anti-folate receptor vaccine (FRα), in combination with AstraZeneca’s durvalumab (MEDI4736), an anti-PD-L1 antibody, in patients with platinum-resistant ovarian cancer.

The study will commence in the second quarter of 2016. The two Companies will share clinical costs, while TapImmune will supply TPIV 200 and MedImmune will supply Durvalumab (MED14736) for the trials. TapImmune recently obtained Orphan Drug Designation for TPIV 200 in ovarian cancer from the US Food and Drug Administration (FDA).

This single arm Phase II trial will include 40 women with high-grade ovarian, tubal, or primary peritoneal carcinomas, who have progressed within 6 months of their most recent platinum chemotherapy. The primary objective of the study is to determine the effectiveness of the combination by measuring Overall Response Rate (ORR) by RECIST and Progression Free Survival (PFS) rate at 6 months.  Secondary endpoints will be safety and immune and correlation of FRα-specific immune responses with clinical efficacy.  

“This collaboration is a significant event for TapImmune,” stated Dr. Glynn Wilson, Chairman and CEO of TapImmune. “We are delighted to bring a leading T-cell vaccine platform into this combination study and to work with AstraZeneca/Medimmune and Sloan Kettering in a patient population that is in dire need of an effective treatment.

“This study is part of a larger Phase II strategy for TPIV 200 that is designed to greatly increase our understanding of the vaccine while providing clinical evidence of efficacy.”

TPIV 200 was safe and well tolerated in a Phase I trial

TPIV 200 is a multi-epitope peptide vaccine that targets Folate Receptor Alpha, which is overexpressed in multiple cancers including over 90% of ovarian cancer cells.  In Phase I clinical studies conducted at the Mayo Clinic in patients with breast and ovarian cancer, this vaccine was shown to be safe and well tolerated and to give robust cellular immune responses in 20 out of 21 evaluable patients.  

Durvalumab is an investigational human monoclonal antibody directed against PD-L1. Signals from PD-L1 help tumours avoid detection by the immune system. Durvalumab blocks these signals, countering the tumour’s immune-evading tactics. Durvalumab is being developed, alongside other immunotherapies, to empower the patient’s immune system and attack the cancer. Durvalumab is being investigated in an extensive clinical trial programme, as monotherapy or in combination with tremelimumab, in NSCLC, head and neck, gastric, pancreatic, bladder and blood cancers.