Novocure announced it has entered into a clinical trial collaboration agreement with MSD, a tradename of Merck & Co. Inc., Rahway, NJ, USA, to study the use of Tumor Treating Fields (TTFields) concomitant with MSD's anti-PD-1 therapy KEYTRUDA® (pembrolizumab) for the treatment of patients with newly diagnosed glioblastoma (GBM). This is the second clinical collaboration between Novocure and MSD.

Novocure and MSD plan to conduct a double-blind, placebo-controlled study of TTFields concomitant with KEYTRUDA and maintenance temozolomide (TMZ) versus TTFields together with placebo and maintenance TMZ for the treatment of adult patients with newly diagnosed GBM. Novocure intends to engage FDA in the near term in a pre-submission discussion regarding the details of the agreed upon study. The EF-41/Keynote D58 trial will build on encouraging preliminary data from the 2-THE-TOP phase 2 pilot study.

The 2-THE-TOP trial is an investigator-initiated, phase 2 pilot trial evaluating the use of TTFields therapy together with pembrolizumab and chemotherapy (temozolomide) for the treatment of 26 adult patients with newly diagnosed GBM. In March 2022, updated data from the ongoing 2-THE-TOP study was presented at the World Federation of Neuro-oncology Societies (WFNOS) 2022 Quadrennial Meeting, comparing outcomes for 26 patients in the 2-THE-TOP study versus a historical, matched-control group of 26 patients from the TTFields plus temozolomide arm of the phase 3 pivotal EF-14 clinical trial. Patients in the 2-THE-TOP trial displayed median progression-free survival (primary endpoint) of 12.1 months and median overall survival of 25.2 months, which are based on a median follow-up time of 16.8 months.

Additionally, 193,760 peripheral blood mononuclear cells were sequenced in 12 patients before pembrolizumab was administered and detected robust post-TTFields T cell activation in 11 of 12 patients via the T1IFN trajectory with a strong correlation with the TCRaß clonal expansion Simpson index (Spearman coefficient r=-0.8, P=0.014). Tumor Treating Fields, or TTFields, are electric fields that disrupt cancer cell division. Fundamental scientific research extends across more than two decades and, in all preclinical research to date, TTFields have demonstrated a consistent anti-mitotic effect.

TTFields therapy is intended principally for use together with other standard-of-care cancer treatments. There is a growing body of evidence that supports TTFields' broad applicability with certain other cancer therapies, including radiation therapy, certain chemotherapies and certain immunotherapies. In clinical research and commercial experience to date, TTFields therapy has exhibited no systemic toxicity, with mild to moderate skin irritation being the most common side effect.

The TTFields global development program includes a network of preclinical collaborators and a broad range of clinical trials across all phases, including four phase 3 pivotal trials in a variety of tumor types. To date, more than 24,000 patients have been treated with TTFields therapy.