ESTRO 2024 - Abstract Book

S1877

Clinical - Mixed sites, palliation

ESTRO 2024

which was administered once, in first day of radiotherapy; and a second plan, for the rest of the treatment, with a homogeneous dose in the whole PTV.

IMRT or VMAT were used to plan the inhomogeneus session, and for the rest of the treatment, another plan was created, with, 3-dimensional radiotherapy (3DRT), IMRT, or VMAT.

Treatment planning was performed with TPS Eclipse (Varian Medical Systems, Palo Alto, California-USA) and Monaco (Elekta AB, Stockholm, Sweden). To obtain the strong gradient in the inner volumes, IMRT was used in the case of the Eclipse TPS. Subsequently, with the use of the Monaco TPS, the technique of choice has been VMAT. The doses in the OARs involved have remained within their tolerances for the entire treatment, including both phases. Planning has sought to maintain a balance of compromise between baseline PTV conformation and internal volume intensification.

Daily image-guidance was performed mainly through daily Cone-beam CT (CBCT), with some very limited cases where portal images were used.

Patients were followed during radiotherapy treatment to assess potential toxicities, and again in months 1, 3, 6, 12, and 18 when possible, to assess tumour response.

Results: