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100 1 _ |a Regnery, Sebastian
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245 _ _ |a SMART ablation of lymphatic oligometastases in the pelvis and abdomen: Clinical and dosimetry outcomes.
260 _ _ |a Amsterdam [u.a.]
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520 _ _ |a To demonstrate dosimetry benefits and report clinical outcomes of stereotactic magnetic resonance (MR)-guided online adaptive radiotherapy (SMART) of abdominopelvic lymphatic oligometastases.Prospective registry data of 26 patients with 31 oligoprogressive lymphatic metastases (1 - 2 lesions) who received SMART between April 2020 and April 2021 was analyzed. Prostate cancer was the most common histology (69%). Most patients (63%) had received previous abdominopelvic radiotherapy (RT). SMART was delivered in 3 - 7 fractions based on planning target volume (PTV) location and previous dose exposures. For SMART, the baseline plan was recalculated on daily 3D MR-imaging (predicted plan), and plan adaptation was mandatory in case of planning objective violations.Plan adaptation was mostly performed due to violation of planning objectives in the predicted plan (134/140 fractions, 96%) and significantly improved plan dosimetry: 1) PTV coverage was increased (predicted: median 89%, adapted: median 95%, p < 0.001), 2) organs-at-risk (OAR) overdoses were reduced (predicted: 27/140 (19%), adapted: 1/140 (1%), p < 0.001) and 3) PTV overdoses were reduced (predicted: 21/140 (15%), adapted: 1/140 (1%), p < 0.001). After a median follow-up of 9.8 months, one patient had in-field tumor progression and twelve patients had out-field tumor progression (at 6 months: progression-free survival: 63% [46 - 88%], local control rate: 97% [90 - 100%]). Treatment was tolerated well and no grade ≥ 3 toxicity was reported.SMART improves target volume coverage and yields superior OAR protection compared to non-adaptive radiotherapy, thus representing an innovative approach to challenging cases, such as repeated radiotherapy.
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650 _ 7 |a Image-Guided Radiotherapy (IGRT)
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650 _ 7 |a Lymphatic Metastasis
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650 _ 7 |a Magnetic Resonance Imaging (MRI)
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650 _ 7 |a Pelvic Neoplasms
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650 _ 7 |a Prostate Cancer
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650 _ 7 |a Stereotactic Body Radiotherapy (SBRT)
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700 1 _ |a Buchele, Carolin
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700 1 _ |a Piskorski, Lars
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700 1 _ |a Weykamp, Fabian
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700 1 _ |a Held, Thomas
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700 1 _ |a Eichkorn, Tanja
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700 1 _ |a Rippke, Carolin
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700 1 _ |a Katharina Renkamp, C.
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700 1 _ |a Klüter, Sebastian
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700 1 _ |a Ristau, Jonas
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700 1 _ |a König, Laila
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700 1 _ |a Koerber, Stefan A
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700 1 _ |a Adeberg, Sebastian
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700 1 _ |a Debus, Jürgen
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700 1 _ |a Hörner-Rieber, Juliane
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773 _ _ |a 10.1016/j.radonc.2022.01.038
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