Prospective randomized controlled study comparing cell block method and conventional smear method for pancreatic...

Area of Science:

• Gastroenterology
• Cytopathology
• Oncology

Background:

• Pancreatic cancer diagnosis often relies on cytological examination of pancreatic juice.
• Conventional smear cytology can yield equivocal results, necessitating improved diagnostic methods.

Purpose of the Study:

• To compare the diagnostic efficacy of the cell block (CB) method versus conventional smear cytology for pancreatic juice.
• To evaluate diagnostic accuracy, sensitivity, and rates of borderline malignancy in pancreatic lesions.

Main Methods:

• A randomized controlled trial involving 170 patients with suspicious pancreatic lesions undergoing ERCP.
• Pancreatic juice was randomized to either the cell block method (n=85) or smear cytology (n=85).
• Cell block sections were stained with H&E, PAS-AB, and IHC; smears used Papanicolaou and Giemsa stains.

Main Results:

• The CB method had a significantly lower rate of borderline malignancy (3.5%) compared to smear cytology (27.1%).
• Overall diagnostic accuracy was comparable (CB: 76.5%, Smear: 74.1%).
• CB sensitivity was superior for invasive ductal carcinoma in the pancreatic head (88.9% vs. 42.9%).

Conclusions:

• The cell block method reduces equivocal borderline malignancy rates in pancreatic juice cytology.
• CB shows a trend towards higher diagnostic yield and improved sensitivity for specific pancreatic cancers.
• Further improvements in sensitivity are needed for widespread application, except for pancreatic head cancer.