Objective of GLIOMARK is to clinically validate the permeability of the blood brain barrier (BBB) as an in vivo biomarker for the diagnosis and grading of gliomas. This will be accomplished by means of the radiotracer 99mTc-tetrofosmin (TTF) and the imaging technique Single-Photon Emission Computer To-mography (SPECT). The outcome of GLIOMARK is GlioTect, a diagnostic kit containing handling/diagnostic instructions and tetrofosmin. The latter has to be reconstituted with 99mTc pertechnetate to yield TTF, which will be used in combination with SPECT. Often computer tomography or magnetic resonance imaging are unable to detect low-grade gliomas or distinguish glioma from other diseases. Hence, brain biopsies are necessary for confirmation of diagnosis and grading of gliomas. GlioTect with TTF/SPECT enables reliable, fast differential diagnosis and grading of gliomas as non-invasive method. This has an immediate impact on the type and aggressiveness of subsequent therapies.Gliomas are recognized as a rare tumor disease with poor prognosis and orphan diagnostic designation for GlioTect will guarantee 10 years of market exclusivity upon approval. ProActina, a Greek chemical-speciality SME having identified this innovative niche market opportunity could become global market leader in glioma diagnostics. Development is at TLR level 6-7 and will be lifted to 9. Expected market application is the sale of GlioTect for preparation of TTF for use with SPECT. End users are hospitals that use the kit to reliably diagnose or exclude gliomas without the need for expensive equipment.Taken together, the aggregated unique selling point of SPECT in combination with TTF (generated by means of GlioTect) is the first ever and only glioma diagnostic, which assesses a clinically validated glioma biomarker, has high reliability, reproducibility, sensitivity, as well as specificity, which is used to replace an invasive method, is safe, well tolerated, widely available and more affordable.