Reference : 192ir Low Dose Rate Brachytherapy for Boosting Locally Advanced Prostate Cancers afte...
Scientific journals : Article
Human health sciences : Radiology, nuclear medicine & imaging
Human health sciences : Oncology
http://hdl.handle.net/2268/3696
192ir Low Dose Rate Brachytherapy for Boosting Locally Advanced Prostate Cancers after External Beam Radiotherapy: A Phase Ii Trial
English
[fr] Brachythérapie de la prostate à base dose à l'iridium 192
Nickers, Philippe mailto [Université de Liège - ULg > > Département des sciences cliniques >]
Coppens, Luc mailto [Centre Hospitalier Universitaire de Liège - CHU > > Urologie >]
De Leval, Jean mailto [Centre Hospitalier Universitaire de Liège - CHU > > Urologie >]
Jansen, Nicolas mailto [Centre Hospitalier Universitaire de Liège - CHU > > Radiothérapie >]
Deneufbourg, Jean-Marie mailto [Université de Liège - ULg > Services généraux (Faculté de médecine) > Relations académiques et scientifiques (Médecine) >]
Jun-2006
Radiotherapy & Oncology
Elsevier Scientific
79
3
329-34
Yes (verified by ORBi)
International
0167-8140
Clare
[en] brachytherapie ; iridium192 ; low dose rate ; prostate
[en] BACKGROUND AND PURPOSE: To evaluate on 201 locally advanced prostatic cancers prospectively treated in a phase II trial, the efficacy of a combination of external beam radiotherapy (39.6 Gy) and (192)Ir low dose rate brachytherapy (Bt) (40-45 Gy). PATIENTS AND METHODS: Sixty-four patients were included in the intermediate prognosis group with only one of the following adverse factors (PSA > 10 ng/ml, Gleason score > or = 7 or clinical stage > or =T2b) and 137 in the unfavourable group when at least two of these factors were present. RESULTS: The actuarial 4 years biochemical no evidence of disease is 82.8% for the entire population. It is, respectively, 97 and 76% in the intermediate and unfavourable prognosis groups (P < 0.0001). Grade > or =3 late urinary complications occurred in 13 patients (6.5%). Eight patients (4%) presented late grade 2 rectal complications but no grades 3-5 was observed. CONCLUSIONS: Even if an alpha/beta of 1.5-3 Gy theoretically favours the use of a high dose rate mode of irradiation, the early results presented here are as good as those reported for similar groups of patients with high dose rate treatments. Late toxicity is identical but our urinary toxicity is within the less favourable and rectal toxicity within the most favourable results. We can postulate that while inducing very high hyperdosage regions (V150) mainly focused on the peripheral zone, most of the Bt techniques consist of a more ablative treatment. Many of the radiobiological studies on Bt did not in fact take into account the heterogeneity of irradiation inside the CTV. This study highlights the need to explore pulsed dose rate therapies, permanent implant and new available radioisotopes such as (169)Ytterbium that will offer the safety of low and lower dose rates. The actual late toxicity of the different Bt techniques is not yet inexistent indeed.
Researchers ; Professionals
http://hdl.handle.net/2268/3696
also: http://hdl.handle.net/2268/3703
10.1016/j.radonc.2006.05.013

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