Comparison of cytologic preparation methods in endoscopic ultrasound-guided fine needle aspiration for diagnosis of pancreatic adenocarcinoma.
BACKGROUND
There are few studies about the diagnostic yield of cytologic preparation method of pancreatic samples obtained by Endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA). The aim of this study was to compare the accuracy of ThinPrep(®) and smear method in diagnosis of pancreatic cancer.


METHODS
A total of 125 EUS-FNA procedures were performed between July 2010 and June 2015. Patients in group I (n = 36; July 2010 to June 2014) had cytology slides prepared by consecutive allocation of samples. Patients in group II (n = 12; July 2014 to June 2015) had cytology slides prepared by alternately allocation of samples.


RESULTS
There were 24 men and 24 women (median age: 67 years; range 39-84). The median size of lesions was 3.9 cm (range; 1.4-7.2 cm). The locations of the pancreatic cancer were 10 in head (20.8%), 21 in body (43.8%), and 17 in tail (35.4%). The ThinPrep(®) method confirmed malignancy in 35 of 48 cases (72.9%). On the other hand, the smear method confirmed malignancy in 44 of 48 cases (91.7%). The diagnostic yield of smear method was statistically higher than liquid method (P = 0.012). Also, smear method is superior to liquid method in both consecutive and alternative allocation method. ThinPrep(®) provided a correct diagnosis in one case where the smear method was incorrect.


CONCLUSIONS
Smear method was a superior preparation method to liquid method in diagnosis of pancreatic cancer, even if splitting method was not used and variable allocation method was used.
Division of Gastroenterology and Hepatology, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea.
Kyong Joo
KJ
Lee
Division of Gastroenterology and Hepatology, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea.
Yong Seok
YS
Kang
Department of Pathology, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea.
Mee Yon
MY
Cho
Division of Gastroenterology and Hepatology, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea. Electronic address: jawkim96@yonsei.ac.kr.
Jae Woo
JW
Kim
D000230:Adenocarcinoma / Q000000981:diagnostic imaging / Q000473:pathology*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D061765:Endoscopic Ultrasound-Guided Fine Needle Aspiration / Q000379:methods*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D014057:Tomography, X-Ray Computed
EUS-FNA; Pancreatic cancer; Smear; ThinPrep(®)