The observational trial led by Ivanidze [81] is expected to evaluate the diagnostic accuracy of hybrid [68Ga]Ga-DOTATATE PET/MRI in meningiomas and other SSTR2-positive brain tumors compared to MRI alone, and secondarily correlate rates of tracer uptake to the expressions of SSTR2, Ki67, progesterone receptor, and EGFR. This evidence concerns the gene MKI67 and meningioma.