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Impact of inter-observer variability on first axillary level dosimetry in breast cancer radiotherapy: An AIRO multi-institutional study.


ABSTRACT: This study quantified the incidental dose to the first axillary level (L1) in locoregional treatment plan for breast cancer. Eighteen radiotherapy centres contoured L1-L4 on three different patients (P1,2,3), created the L2-L4 planning target volume (single centre planning target volume, SC-PTV) and elaborated a locoregional treatment plan. The L2-L4 gold standard clinical target volume (CTV) along with the gold standard L1 contour (GS-L1) were created by an expert consensus. The SC-PTV was then replaced by the GS-PTV and the incidental dose to GS-L1 was measured. Dosimetric data were analysed with Kruskal-Wallis test. Plans were intensity modulated radiotherapy (IMRT)-based. P3 with 90° arm setup had statistically significant higher L1 dose across the board than P1 and P2, with the mean dose (Dmean) reaching clinical significance. Dmean of P1 and P2 was consistent with the literature (77.4% and 74.7%, respectively). The incidental dose depended mostly on L1 proportion included in the breast fields, underlining the importance of the setup, even in case of IMRT.

SUBMITTER: Leonardi MC 

PROVIDER: S-EPMC10702305 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature

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Impact of inter-observer variability on first axillary level dosimetry in breast cancer radiotherapy: An AIRO multi-institutional study.

Leonardi Maria Cristina MC   Pepa Matteo M   Zaffaroni Mattia M   Vincini Maria Giulia MG   Luraschi Rosa R   Vigorito Sabrina S   Morra Anna A   Dicuonzo Samantha S   Mazzola Giovanni Carlo GC   Gerardi Marianna Alessandra MA   Zerella Maria Alessia MA   Cante Domenico D   Petrucci Edoardo E   Borzì Giuseppina G   Marrocco Maristella M   Chieregato Matteo M   Iadanza Luciano L   Lobefalo Francesca F   Valenti Marco M   Cavallo Anna A   Russo Serenella S   Guernieri Marika M   Malatesta Tiziana T   Meaglia Ilaria I   Liotta Marco M   Palumbo Isabella I   Marcantonini Marta M   Mezzenga Emilio E   Falivene Sara S   Arrichiello Cecilia C   Barbero Maria Paola MP   Ivaldi Giovanni Battista GB   Catalano Gianpiero G   Vidali Cristiana C   Giannitto Caterina C   Ciabattoni Antonella A   Meattini Icro I   Aristei Cynthia C   Orecchia Roberto R   Cattani Federica F   Jereczek-Fossa Barbara Alicja BA  

Tumori 20230909 6


This study quantified the incidental dose to the first axillary level (L1) in locoregional treatment plan for breast cancer. Eighteen radiotherapy centres contoured L1-L4 on three different patients (P1,2,3), created the L2-L4 planning target volume (single centre planning target volume, SC-PTV) and elaborated a locoregional treatment plan. The L2-L4 gold standard clinical target volume (CTV) along with the gold standard L1 contour (GS-L1) were created by an expert consensus. The SC-PTV was then  ...[more]

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