ESTRO 2024 - Abstract Book

S305

Brachytherapy - Head & neck, skin, eye

ESTRO 2024

However, the IS gave statistically significantly higher target dose and hot spots (D90 = 111.0±8.7%, P=0.04 and V150 = 63.7±8.3%, P<<0.01), while the SC was producing similar dose distributions (D90 = 108.1±5.9%, P=0.08 and V150 = 41.7±12.6%, P=0.18) compared with the clinical IS+SC plans (D90 = 106.8±4.4% and V150 = 36.0±9.2%). The treated volume is significantly larger with the SC (P=0.03) compared with the IS+SC.

Fig. 2. A 67-year-old patient with lip cancer before the treatment (A), one month after the brachytherapy treatment (B), three months after brachytherapy treatment (C).

Conclusion:

HDR Brachytherapy can deliver the most conformal radiation dose to the lip cancers. HDR-BT using IS, SC, or IS + SC is an effective treatment for the lip cancer with good outcomes and cosmetic results. The IS approach provides more heterogeneous and local distribution. The SC provides more uniform dosimetry than the IS technique, but typically has a larger irradiated volume. It is also quite difficult to make surface custom mold applicators (SC) to fit the irregular surface of the lip, so this aproach is used more rarely. In terms of dosimetry, the IS+SC may be the best solution for the lip HDR-BT.

Keywords: Lip cancer, high-dose-rate brachytherapy

1720

Proffered Paper

High-Dose Rate Brachytherapy as an Efficacious and Aesthetic Alternative in Early-Stage Nasal Cancer

Leila Ettalhaoui 1 , Philippe Guilbert 1 , Stéphane Vignot 2 , Nathaniel Assouly 3 , Esteban Brenet 4 , Manuelle-Anne Viguier 5 , Alexandre Roque 6 , Felix Felici 1 , Arnaud Beddok 1 , Antonio Da Silva Ribeiro Mota 1 1 Institut Godinot, Radiothérapie, Reims, France. 2 Institut Godinot, Oncologie médicale, Reims, France. 3 Institut Godinot, ORL, Reims, France. 4 CHU Reims, ORL, Reims, France. 5 CHU Reims, Dermatologie, Reims, France. 6 Institut Godinot, Physique médicale, Reims, France

Purpose/Objective: