Abstract
Radiopharmaceutical therapy, traditionally limited to refractory metastatic cancer, is being increasingly used at earlier stages, such as for treating minimal residual disease. The aim of this study was to compare the effectiveness of (90)Y, (177)Lu, (111)In, and (161)Tb at irradiating micrometastases. (90)Y and (177)Lu are widely used β(-)-emitting radionuclides. (161)Tb is a medium-energy β(-) radionuclide that is similar to (177)Lu but emits a higher percentage of conversion and Auger electrons. (111)In emits γ-photons and conversion and Auger electrons. We used the Monte Carlo code CELLDOSE to assess electron doses from a uniform distribution of (90)Y, (177)Lu, (111)In, or (161)Tb in spheres with diameters ranging from 10 mm to 10 μm. Because these isotopes differ in electron energy per decay, the doses were compared assuming that 1 MeV was released per μm(3), which would result in 160 Gy if totally absorbed. In a 10-mm sphere, the doses delivered by (90)Y, (177)Lu, (111)In, and (161)Tb were 96.5, 152, 153, and 152 Gy, respectively. The doses decreased along with the decrease in sphere size, and more abruptly so for (90)Y. In a 100-μm metastasis, the dose delivered by (90)Y was only 1.36 Gy, compared with 24.5 Gy for (177)L...Continue Reading
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