Design of the study Prospective, single arm, multicentric, phase II open trial Number of participating sites 14 French centers of HPB Surgery departments associated with 14 Radiation Oncology Departments.
Implementation of the study A screening of eligible patients will be made locally by the referring surgeon of each centre based on patient medical records.
* Inclusion visit at the first surgical consultation (W-3 to D1) (V0) The inclusion visit will be done by the surgeon within 3 weeks before the first radiation oncologist visit * D1 (V1): first radiation oncologist visit * W2 (+/- 3D) and W4 (+/- 3D) (V2 et V3): Preoperative simulation process and treatment delivery * A first visit at W+2 (+/- 3 D) will be mandatory to validate the positioning of the target volume by CBCT with IV constrast or MRI * Then to start of the administration of radiotherapy at W+4 (+/- 3 D): Radiotherapy with 20 Gy, in 2 fraction of 10Gy with a one-day gap, so over a total period of 3
W9 ( +/- 1W) (V4): post-radiotherapy follow-up
\- Preoperative visit Day-1 before PD (V5)
W10 (+/- 1W) (V6):
* Pancreaticoduodenectomy and post operative hospitalisation W14 (+/- 1W) (V7): follow up with surgeon (30 days after pancreaticoduodenectomy) * W22 (+/-1W) (V8): follow up with surgeon (90 days after pancreaticoduodenectomy) * W34 (+/-1W) (V9): Last study visit (radiation oncologist) (6 months after pancreaticoduodenectomy) Medical follow-up by radiation oncologist at 6 months after surgery to assess the occurrence of potential late toxicities due to radiotherapy
Aged ≥ 45 years old
Candidate for pancreaticoduodenectomy by laparotomy
Body mass index (BMI) ≥ 25kg/m2
Diameter of main pancreatic duct (MPD) < 3 mm on preoperative CT scan or MRI at the isthmus of the pancreas (future pancreatic section area)
Surgery indication : Chronic pancreatitis
Surgery indication : Pancreatic ductal adenocarcinoma
History of syndromic or hereditary pancreatic tumor
Contraindication to pancreaticoduodenectomy