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. The gene discussed is SSTR2; the disease is brain neoplasm.