Flamingo Therapeutics has dosed the first patients in the UK and South Korea in the ongoing Phase II PEMDA-HN clinical trial, which is assessing the combination of danvatirsen and MSD’s Keytruda (pembrolizumab) for recurrent/metastatic head and neck squamous cell carcinoma (HNSCC).

The move marks the expansion of the trial, which began enrolling patients in the US in February this year.

Danvatirsen is Flamingo’s lead oncology programme. Discovered by Ionis Pharmaceuticals, it is an antisense oligonucleotide that targets signal transducer and activator of transcription 3 (STAT3) and has demonstrated clinical activity in HNSCC.

The multi-centre, open-label, randomised study aims to assess the safety and efficacy of danvatirsen and pembrolizumab against pembrolizumab alone as first-line treatment of patients with programmed death-ligand 1 (PD-L1) expressing tumours.

Two-thirds of subjects will be randomised to receive the combination therapy and one-third will receive only pembrolizumab.

The study’s primary endpoint is to determine the overall response rate while the secondary endpoints will focus on response duration, safety, disease control rate, progression-free survival and overall survival.

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Flamingo CMO Andrew Denker said: “HNSCC is a difficult-to-treat cancer, with approximately 890,000 new cases each year globally, and accounts for almost 5% of global cancer deaths. Patients are in need of new therapies and we are pleased to have expanded our study beyond the US.

“This is a significant milestone in the advancement of the PEMDA-HN study, and we are thankful for the support of our study participants, their families and our global collaborators.”

In addition to the PEMDA-HN trial, Flamingo has initiated a Phase I study to investigate danvatirsen as both a monotherapy and in combination with venetoclax for patients with AML/MDS.