lutathera - Medication Listings

Lutetium Lu 177 dotatate is a radiolabeled somatostatin analog. The drug substance lutetium Lu 177 dotatate is a cyclic peptide linked with the covalently bound chelator 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid to a radionuclide. Lutetium Lu 177 dotatate is described as lutetium (Lu 177)-N-[(4,7,10-Tricarboxymethyl-1,4,7,10-tetraazacyclododec-1-yl) acetyl]-D-phenylalanyl-L-cysteinyl-L-tyrosyl-D-tryptophanyl-L-lysyl-L-threoninyl-L-cysteinyl-L-threonine-cyclic (2-7) disulfide. The molecular weight is 1609.6 Daltons and the structural formula is as follows: LUTATHERA (lutetium Lu 177 dotatate) 370 MBq/mL (10 mCi/mL) Injection is a sterile, clear, colorless to slightly yellow solution for intravenous use. Each single-dose vial contains acetic acid (0.48 mg/mL), sodium acetate (0.66 mg/mL), gentisic acid (0.63 mg/mL), sodium hydroxide (0.64 mg/mL), ascorbic acid (2.8 mg/mL), diethylene triamine pentaacetic acid (0.05 mg/mL), sodium chloride (6.85 mg/mL), and Water for Injection (ad 1 mL). The pH range of the solution is 4.5 to 6. Lutetium Lu 177 dotatate structural formula 11.1 Physical Characteristics Lutetium-177 decays to stable hafnium-177 with a half-life of 6.647 days, by emitting beta-minus radiation with a maximum energy of 0.498 MeV (79%) and photonic radiation (γ) of 0.208 MeV (11%) and 0.113 MeV (6.2%). The main radiations of lutetium-177 are detailed in Table 7. Table 7. Lutetium-177 Main Radiations Radiation Energy (keV) Iβ - % Iγ% β - 176.5 12.2 β - 248.1 0.05 β - 384.9 9.1 β - 497.8 78.6 γ 71.6 0.15 γ 112.9 6.20 γ 136.7 0.05 γ 208.4 11.0 γ 249.7 0.21 γ 321.3 0.22 11.2 External Radiation Table 8 summarizes the radioactive decay properties of lutetium-177. Table 8. Physical Decay Chart: Lutetium-177 Physical Half-Life = 6.647 Days Hours Fraction remaining Hours Fraction remaining 0 1.000 48 (2 days) 0.812 1 0.996 72 (3 days) 0.731 2 0.991 168 (7 days) 0.482 5 0.979 336 (14 days) 0.232 10 0.958 720 (30 days) 0.044 24 (1 day) 0.901 1080 (45 days) 0.009