title: Estimates of radiation-absorbed dose to kidneys in patients treated with 90Y-ibritumomab tiuxetan.
abstract: The aim of the present study was to retrospectively estimate the absorbed dose to kidneys in 17 patients treated in clinical practice with 90Y-ibritumomab tiuxetan for non-Hodgkin's lymphoma, using appropriate dosimetric approaches available.
  
  
  METHODS
  The single-view effective point source method, including background subtraction, is used for planar quantification of renal activity. Since the high uptake in the liver affects the activity estimate in the right kidney, the dose to the left kidney serves as a surrogate for the dose to both kidneys. Calculation of absorbed dose is based on the Medical Internal Radiation Dose methodology with adjustment for patient kidney mass.
  
  
  RESULTS
  The median dose to kidneys, based on the left kidney only, is 2.1 mGy/MBq (range, 0.92-4.4), whereas a value of 2.5 mGy/MBq (range, 1.5-4.7) is obtained, considering the activity in both kidneys.
  
  
  CONCLUSIONS
  Irrespective of the method, doses to kidneys obtained in the present study were about 10 times higher than the median dose of 0.22 mGy/MBq (range, 0.00-0.95) were originally reported from the study leading to Food and Drug Administration approval. Our results are in good agreement with kidney-dose estimates recently reported from high-dose myeloablative therapy with 90Y-ibritumomab tiuxetan.
authors.affiliation: The Russell H. Morgan Department of Radiology and Radiological Sciences, Johns Hopkins University, School of Medicine, Baltimore, MD, USA. sebastien.baechler@chuv.ch
authors.forename: Sébastien
authors.initials: S
authors.lastname: Baechler
authors.forename: Robert F
authors.initials: RF
authors.lastname: Hobbs
authors.forename: Andrew R
authors.initials: AR
authors.lastname: Prideaux
authors.forename: Mélanie
authors.initials: M
authors.lastname: Recordon
authors.forename: Angelika
authors.initials: A
authors.lastname: Bischof-Delaloye
authors.forename: George
authors.initials: G
authors.lastname: Sgouros
mesh_terms: D000911:Antibodies, Monoclonal / Q000494:pharmacology*; D001835:Body Weight; D005260:Female; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging*; D007700:Kinetics; D009369:Neoplasms / Q000532:radiotherapy*; D011829:Radiation Dosage; D016499:Radioimmunotherapy / Q000379:methods*; D011874:Radiometry / Q000379:methods*; D011877:Radionuclide Imaging; D012189:Retrospective Studies; D013997:Time Factors; D014057:Tomography, X-Ray Computed / Q000379:methods; D051598:Whole Body Imaging; D015021:Yttrium Radioisotopes / Q000494:pharmacology*
chemical_list: D000911:Antibodies, Monoclonal; D015021:Yttrium Radioisotopes; C422802:ibritumomab tiuxetan