Diffusion MRI for Pancreatic Adenocarcinoma

Hospices Civils de Lyon118 enrolled

Overview

The detection of small liver metastases represents a major challenge during the staging process of patients with pancreatic adenocarcinoma. Currently, thoraco-abdominopelvic CT represents the established imaging modality for selecting patients with pancreatic adenocarcinoma for curative surgery. However, despite its performance, 13% to 23% of patients undergoing a surgical procedure are finally found to have an unresectable disease because of arterial involvement, peritoneal carcinomatosis, or the existence liver metastasis that had not been detected by preoperative workup. Compared to CT, diffusion-weighted MRI provides a better contrast resolution for soft tissue and liver imaging, and thus leads to a better detection of focal liver lesions. Hence, it could be hypothesized that the use of DW-MRI in patients with potentially resectable PA may improve the selection process of candidates for curative pancreatic resection by increasing the detection of LM undiagnosed by traditional preoperative work-up

Study Type

INTERVENTIONAL

Allocation

Purpose

DIAGNOSTIC

Masking

NONE

Enrollment

118

Conditions

Pancreatic Adenocarcinoma

Interventions

All MRI examinations will be carried out using a Siemens Magnetom Avanto syngo MR B15 1.5 Tesla (Erlangen, Germany) or a Philips Intera 1.5 Tesla (Eindhoven, The Netherlands) and will include the following sequences: (i) T2 fat sat, with a FOV of 350 x 262, and a matrix of 384 x 207; slices, 30 per sequence, 6 mm thick; (ii) T1 in-phase and out-of-phase with a FOV of 380 x 262, and a matrix of 256 x 158; slices, 30 per sequence, 6 mm thick; (iii) T1 water excitation (= T1 ProSat), with a FOV of 300 x 300, and a matrix of 320 x 220; obtaining 20 slices of 4 mm; (iv) VIBE and THRIVE (dynamic T1 axial 3D EG after injection, during the arterial, portal venous, and late phases, in an axial plane, and optionally in a coronal plane during the portal venous phase), with a FOV of 400 x 312, a matrix of 384 x 192, and with fat suppression and breath-hold; slices 3 mm thick, with liver and pancreatic coverage. Contrast agent: gadobenate dimeglumine (MultiHance, Bracco Imaging, France).

Eligibility

Sex: ALLMin age: 18 YearsMax age: 85 Years

Medical Language ↔ Plain English

Inclusion Criteria: * age \> 18 year old, * no general contraindication for pancreatic surgery, * pancreatic mass suspected or demonstrated to be a pancreatic adenocarcinoma, * CAP CT of excellent technical quality showing a pancreatic tumor deemed resectable or border line (portal and/or superior mesenteric venous circumferential involvement \< 180° * Resectability confirmed by a medical/surgical multidisciplinary review, * if neoadjuvant therapy was applied, patients were included in the study: only the second evaluation will be considered. * informed consent prepared and signed. Exclusion Criteria: * locally advanced pancreatic adenocarcinoma (involvement \> 180°in circumference of superior mesenteric venous (SMV) or portal vein, superficial vein thrombosis, superior mesenteric artery (SMA) involvement \< 180°) * unresectable tumour (circumferential involvement \> 180 ° of the SMA, involvement of the celiac artery, thrombosis of the portal vein or vena cava, or complete VMS thrombosis * metastasis of any organ visible on thoraco-abdominopelvic CT scan * time lag exceeding 21 days between diffusion-weighted MRI and surgery * contraindication for an MRI

Outcomes

Primary Outcomes

The rate of detection of liver metastasis on diffusion-weighted MRI in patients with potentially resectable pancreatic adenocarcinoma.

The primary outcome will be measured at the time of diagnosis of liver metastasis, either based on histological study (within one month after surgery or biopsy) or based on follow-up (maximum time frame of 24 months after inclusion).

Time frame: At the time of diagnosis of liver metastasis on histological study or based on follow-up (maximum time frame of 24 months after inclusion).

Secondary Outcomes

Diagnostic performance of diffusion-weighted MRI for the preoperative diagnosis of liver metastasis in patients with potentially resectable adenocarcinoma

Sensitivity, specificity, predictive positive value, negative predictive value and accuracy of diffusion-weighted MRI for the preoperative diagnosis of liver metastasis in patients with potentially resectable adenocarcinoma. The reference standard for the positive diagnosis of liver metastasis will be based on the pathological report of preoperative or intraoperative biopsies. In case of absence of tissue sample, the definitive diagnosis will be based on the 2-year follow-up.

Time frame: At the time of diagnosis of liver metastasis on histological study or based on follow-up (maximum time frame of 24 months after inclusion).

Rate of patients for whom the therapeutic strategy is modified as a consequence of the diagnosis of liver metastasis on diffusion-weighted MRI

Modification of therapeutic strategy is defined by abandonment of surgical exploration and/or of pancreatic excision after surgical exploration

Time frame: At the time of diagnosis of liver metastasis on histological study or based on follow-up (maximum time frame of 24 months after inclusion).