Medivir AB announced that it has finalized the development of an updated formulation of fostrox, suitable for commercial manufacture. HCC is a potentially life-threatening form of liver cancer and the third leading cause of cancer-related death worldwide. The need for new treatments is high and the development of an updated commercial formulation is an additional step towards fostrox becoming a treatment option for HCC patients.

The development efforts have been carried out by Quotient Sciences, Medivir's partner for formulation development and manufacture of drug product. Fostrox is currently being evaluated in an ongoing phase 1b/2a study in combination with Lenvima, a tyrosine kinase inhibitor. It is an open-label, multicenter study and includes patients with HCC for whom current first- or second-line treatment has proven ineffective or is not tolerable.

It has the potential to provide HCC patients, who have progressed on current first line standard of care, with an alternative option where no other treatments are approved. With the study fully recruited and 50% of patients still on treatment, interim data indicates clinical benefit without compromising safety, when fostrox is added to Lenvima in second-line HCC. Based on these promising data, together with the lack of approved medical treatments after tumor progression on first line standard of care, the company has communicated the plan to initiate phase 2b study with accelerated approval intent.

A formulation suitable for commercial manufacture is a critical component in clinical studies with regulatory intent. With the formulation development program successfully finalized, the next step is to manufacture three different strengths of fostrox together with placebo to ensure momentum in the fostrox development program and enable a timely start of the planned phase 2b study.