Early Increase in Blood Flow (EIBS) in the Duodenum in Patients With Pancreatic Cancer

According to field effect theory, by detecting microvasculature changes in the early increase of blood supply in the surrounding tissue neoplastic lesions can be identified from a distance.

The objective of this study was to determine the feasibility and efficacy of a fiberoptic probe containing novel Polarization Gating Spectroscopy (PGS) technology to identify patients with pancreatic adenocarcinoma (PAC) by field effect theory. EIBS markers, deoxyhemoglobin concentration (DHb), and average blood vessel radius (BVR) were evaluated in patients with PAC versus controls.

During the subjects' esophagogastroduodenoscopy (EGD) with upper endoscopic ultrasound (EUS), the new optic probe was inserted inside the endoscope and advanced to the tip of the endoscope prior to the scope being withdrawn. As the scope was withdrawn, the light optic probe was used to examine approximately 5 sections of the small bowel: 1) directly on the ampulla, 2) approximately 5 mm proximal from the ampulla, 3) approximately 5 mm distal from the ampulla, 4) 1 cm proximal from the ampulla, and 5) 1 cm distal from the ampulla. Spectroscopy measurements were obtained four times in each of these five peri-ampullary locations. The rest of the EGD and upper EUS endoscopy procedures were then completed as clinically indicated. During the procedure, all visualized mucosal abnormalities were recorded and photographed.

Inclusion criteria

• Age 18 years or older.
• Informed written consent.
• Patient scheduled for previously planned EGD with upper EUS
• Patients with known adenocarcinoma of the pancreas included in the cancer group
• Patients with abdominal imaging studies (e.g., CT abdomen or MRI abdomen) negative for malignancy in past 5 years included in the control group.

Exclusion criteria

• Unable to obtain biopsy specimen or fine-needle aspiration results of the pancreas lesion (e.g., coagulation disorder, inadequate sample)
• Presence of malignant lesion in the pancreas or duodenum other than pancreas adenocarcinoma (e.g., neuroendocrine tumor, gastrointestinal stromal tumor)
• Known familial disorder with high risk of pancreas cancer development (e.g., familial adenomatous polyposis syndrome, hereditary non-polyposis colorectal cancer syndrome, juvenile polyposis syndrome)
• Significant family history of pancreatic cancer (at least one first degree relative with pancreatic cancer)
• Presence of premalignant lesions (e.g., duodenal adenoma, pancreas intraductal papillary mucinous neoplasm)
• Active visible inflammation/ulcer in the stomach or the duodenum
• Patients with known chronic pancreatitis were excluded from cancer group. Chronic pancreatitis patients were allowed to be included in the control group only.
• Known pregnancy or sexually active females of childbearing age who are not practicing an accepted form of birth control.