Individually optimized stereotactic radiotherapy for pancreatic head tumors: A planning feasibility study

Milly Buwenge, Savino Cilla, Alessandra Guido, Lucia Giaccherini, Gabriella Macchia, Francesco Deodato, Silvia Cammelli, Francesco Cellini, Gian C Mattiucci, Vincenzo Valentini, Markus Stock, Alessio G Morganti

Research output: Journal article (peer-reviewed)Journal article

10 Citations (Scopus)


AIM: Aim of this study was to perform a planning feasibility analysis of a 3-level dose prescription using an IMRT-SIB technique.

BACKGROUND: Radiation therapy of locally advanced pancreatic cancer should administer a minimum dose to the duodenum and a very high dose to the vascular infiltration areas to improve the possibility of a radical resection.

MATERIALS AND METHODS: Fifteen patients with pancreatic head adenocarcinoma and vascular involvement were included. The duodenal PTV (PTVd) was defined as the GTV overlapping the duodenal PRV. Vascular CTV (CTVv) was defined as the surface of contact or infiltration between the tumor and vessel plus a 5 mm margin. Vascular PTV (PTVv) was considered as the CTVv plus an anisotropic margin. The tumor PTV (PTVt) was defined as the GTV plus a margin including the PTVv and excluding the PTVd. The following doses were prescribed: 30 Gy (6 Gy/fraction) to PTVd, 37.5 Gy (7.5 Gy/fraction) to PTVt, and 45 Gy (9 Gy/fraction) to PTVv, respectively. Treatment was planned with an IMRT technique.

RESULTS: The primary end-point (PTVv Dmean > 90%) was achieved in all patients. PTVv D98% > 90% was achieved in 6 patients (40%). OARs constraints were achieved in all patients.

CONCLUSIONS: Although the PTVv D95% > 95% objective was achieved only in 40% of patients, the study showed that in 100% of patients it was possible to administer a strongly differentiated mean/median dose. Prospective trials based on clinical application of this strategy seem to be justified in selected patients without overlap between PTVd and PTVv.

Original languageEnglish
Pages (from-to)548-554
Number of pages7
JournalReports of Practical Oncology and Radiotherapy
Issue number6
Publication statusPublished - 01 Nov 2016
Externally publishedYes


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