First patient enrolled in expanded Phase II clinical trial of TG4001 + avelumab vs avelumab alone in patients with HPV16-positive anogenital cancers

First patient enrolled in expanded Phase II clinical trial of TG4001 + avelumab vs avelumab alone in patients with HPV16-positive anogenital cancers

Strasbourg, France, June 24, 2021, 5:45 pm CET – Transgene (Euronext Paris: TNG), a biotech company that designs and develops virus-based immunotherapeutics against cancer, today announces that a first patient has been enrolled in a randomized, controlled Phase II study evaluating the combination of TG4001 with avelumab versus avelumab monotherapy in patients with HPV16-positive anogenital tumors (NCT: 03260023).

TG4001 IS AN INVESTIGATIONAL THERAPEUTIC VACCINE TARGETING HPV-POSITIVE TUMORS, including cervical, anal, and other anogenital cancers. It is based on a Vaccinia vector (MVA), which is engineered to express HPV16 E6 and E7 antigens and interleukin 2 (IL-2). TG4001 is designed to alert the immune system specifically to cells presenting these HPV antigens (that can be found on HPV-related tumors) and to induce a specific cellular immune response against these cancer cells.

Based on promising data obtained in the Phase Ib/II part of the trial, Transgene is progressing the development of TG4001 in combination with avelumab, through a randomized Phase II trial and an extended collaboration with the alliance of Merck KGaA, Darmstadt, Germany, and Pfizer, which is supplying avelumab.

PHASE II TRIAL AIMS TO SHOW THE SUPERIORITY OF TG4001 + AVELUMAB OVER AVELUMAB MONOTHERAPY

The randomized Phase II trial is focusing on patients with recurrent or metastatic HPV16-positive anogenital cancer, including cervical, vulvar, vaginal, penile, and anal cancer, without liver metastases. In the Phase Ib/II part of the study, very encouraging clinical outcome was observed in patients without liver metastases ^[1,2].

Patients will be randomized to either receive the combination regimen of the therapeutic vaccine TG4001 and avelumab or avelumab alone. The trial will be enrolling patients in the USA and in Europe (France and Spain).

The primary endpoint of the trial is progression-free survival (PFS) according to RECIST 1.1. Secondary endpoints include objective response rate (ORR), disease control rate (DCR), overall survival (OS) and a series of immunological parameters.

An interim analysis will be performed after the enrollment of approximately 50 patients. Transgene expects to communicate interim analysis data around the end of 2022.

Dr. Maud Brandely, MD, PhD, Chief Medical Officer of Transgene, added: “We are confident that the combination regimen of TG4001 and avelumab has the potential to deliver improved progression-free survival for patients with advanced/recurrent HPV16-positive anogenital cancer without liver metastases. This confidence is based on the very encouraging results from the initial Phase Ib/II study, which showed important clinical benefits in this patient population in terms of response rate and progression-free survival. This earlier study part also showed that patients had vaccine-induced reactive T cells against E6, E7 or both. This randomized trial has been designed to further demonstrate that the addition of TG4001 to an immune checkpoint inhibitor can improve the clinical outcome for patients with HPV16-positive anogenital cancer without liver metastases. We are looking forward to announcing the interim results from this expanded study which could be a key milestone in bringing TG4001 to patients in need of improved treatment options.”

About the trial

The multi-center, open label, randomized Phase II trial (NCT03260023) is designed to compare the efficacy of the combination of TG4001 and avelumab versus avelumab alone in patients with HPV16-positive anogenital cancers who have disease progression after a maximum of one line of systemic treatment for recurrent/metastatic disease, or who are not eligible for first-line chemotherapy.

Prof. Christophe Le Tourneau, M.D., PhD, Head of the Department of Drug Development and Innovation (D3i) at the Curie Institute, is the Principal Investigator of the study. The trial is being conducted in collaboration with Merck KGaA, Darmstadt, Germany, and Pfizer Inc. (NYSE: PFE), which are providing avelumab for the trial. Avelumab is co-developed and co-commercialized by Merck KGaA, Darmstadt, Germany and Pfizer Inc. Transgene will continue to be the sponsor of the trial and conduct the trial.

Patients will receive TG4001 at the dose of 5x10⁷ plaque-forming units (pfu), subcutaneously (SC), weekly for 6 weeks, every 2 weeks up to six months, and every 12 weeks thereafter, in combination with avelumab or avelumab alone at 800 mg, intravenously (IV) every two weeks, until disease progression. The primary endpoint of the trial is progression-free survival (PFS) according to RECIST 1.1. Secondary endpoints include objective response rate (ORR), disease control rate (DCR), overall survival (OS) and other immunological parameters. The trial could enroll approximately 150 patients until the final analysis. 

Patients with liver metastases will be followed in an ancillary arm and will not be included in the primary analyses.