Skip Navigation LinksHome > December 2012 - Volume 33 - Issue 12 > 131I-tositumomab myeloablative radioimmunotherapy for non-Ho...
Nuclear Medicine Communications:
doi: 10.1097/MNM.0b013e328358d34b
Original Articles

131I-tositumomab myeloablative radioimmunotherapy for non-Hodgkin’s lymphoma: radiation dose to the testes

Hattori, Naoyaa; Gopal, Ajay K.a,b; Shields, Andrew T.a; Fisher, Darrell R.c; Gooley, Tedb; Pagel, John M.a,b; Press, Oliver W.a,b; Rajendran, Joseph G.a

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Purpose: To investigate radiation doses to the testes delivered by a radiolabeled anti-CD20 antibody and its effects on male sex hormone levels.

Materials and methods: Testicular uptake and retention of 131I-tositumomab were measured, and testicular absorbed doses were calculated for 67 male patients (54±11 years of age) with non-Hodgkin’s lymphoma who had undergone myeloablative radioimmunotherapy (RIT) using 131I-tositumomab. Time–activity curves for the major organs, testes, and whole body were generated from planar imaging studies. In a subset of patients, male sex hormones were measured before and 1 year after the therapy.

Results: The absorbed dose to the testes showed considerable variability (range=4.4–70.2 Gy). Pretherapy levels of total testosterone were below the lower limit of the reference range, and post-therapy evaluation demonstrated further reduction [4.6±1.8 nmol/l (pre-RIT) vs. 3.8±2.9 nmol/l (post-RIT), P<0.05]. Patients receiving higher radiation doses to the testes (≥25 Gy) showed a greater reduction [4.7±1.6 nmol/l (pre-RIT) vs. 3.3±2.7 nmol/l (post-RIT), P<0.05] compared with patients receiving lower doses (<25 Gy), who showed no significant change in total testosterone levels.

Conclusion: The testicular radiation absorbed dose varied highly among individual patients. Patients receiving higher doses to the testes were more likely to show post-RIT suppression of testosterone levels.

© 2012 Lippincott Williams & Wilkins, Inc.


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