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The uptake of L-(2-18F)fluorotyrosine (F-Tyr), a newly synthetized amino acid tracer, was studied in 15 patients with various brain tumors by dynamic PET. The higher F-Tyr accumulation in tumors (mean 27% above contralateral tissue) was associated with two-fold transport rates into tumors, while the rate constants describing irreversible incorporation were decreased. The increased F-Tyr transport was not correlated to 68Ga-EDTA accumulation and cannot be explained by disruption of thepmid:1906093 fatcat:cy7w35ymcncgda2ws2z4uu6buu