Telix Pharmaceuticals Limited has announced a collaborative development and reseller agreement with GE Healthcare to supply its investigational positron emission tomography (PET) imaging radiotracers, TLX250-CDx (89Zr-DFO-girentuximab), and [18F]-FLac (18F-3-fluoro-2-hydroxypropionate) for use in third party clinical research and development activities. These novel tracers offer the potential to provide key information about the metabolic environment of tumours, which could help to inform and improve therapy selection. The agreement was announced during the European Association of Nuclear Medicine (EANM) Congress in Barcelona, Spain.
TLX250-CDx – the subject of Telix’s recently completed Phase III ZIRCON study in clear cell renal cell carcinoma1 – targets the antigen, carbonic anhydrase IX (CAIX). Expressed in many solid tumour types, CAIX can be used to identify hypoxic tumours,2 cells that have been deprived of oxygen, which can correlate with disease progression and resistance to therapy, including immunotherapy. Identifying such tumours may guide changes in care, from immune checkpoint inhibitor (ICI) monotherapy to combination treatments that overcome the hypoxic barrier.
[18F]-FLac, which Telix in-licensed in 2021,3 has shown promise in imaging lactate metabolism in oxygenated tumours. High lactate in tumours could prevent ICI responses and additionally be harmful in patients receiving ICI therapies.4 Understanding tumour lactate metabolic status could guide treatment decisions towards immunotherapy combinations that overcome this barrier.
TLX250-CDx and [18F]-FLac complement GE Healthcare Pharmaceutical Diagnostics’ pipeline of investigational non-invasive [18F]-CD8 and [18F]-Granzyme-B imaging tracers for use by pharmaceutical companies in clinical trials, with the potential to predict and monitor response to immunotherapy. Currently an average of only 20-40 percent of patients respond to immunotherapies, and patient suitability is typically determined by taking tumour biopsies.
Jonathan Barlow, SVP Global Business Development & Alliance Management, Telix, said, “This partnership will see our investigational imaging agents used more widely in third-party clinical trials. Excitingly, it will also help to expedite the development of [18F]-FLac, while expanding the utility of our TLX250-CDx imaging candidate.”
Sanka Thiru, Global Business Leader, Immuno-Oncology, at GE Healthcare‘s Pharmaceutical Diagnostics business, said: “This partnership expands our pharmaceutical services offering, including our toolbox of investigational PET imaging diagnostics. These aim to enrich clinical trials for pharmaceutical companies with the possibility of determining the metabolic environment and immune status of tumours, and if successful, help to improve speed to market for potential therapies. Ultimately, these PET imaging diagnostics could assist in delivering effective oncology therapies to patients.”