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. 2021 May 16;9(14):3308-3319.
doi: 10.12998/wjcc.v9.i14.3308.

Comparison of smear cytology with liquid-based cytology in pancreatic lesions: A systematic review and meta-analysis

Xiao-Hui Zhang  1 , Shi-Yang Ma  1 , Na Liu  1 , Zhong-Cao Wei  1 , Xu Gao  1 , Yu-Jie Hao  1 , Yi-Xin Liu  1 , Ya-Qin Cai  1 , Jin-Hai Wang  2
Affiliations

Comparison of smear cytology with liquid-based cytology in pancreatic lesions: A systematic review and meta-analysis

Xiao-Hui Zhang et al. World J Clin Cases. .

Abstract

Background: Endoscopic ultrasonography-guided fine-needle aspiration (EUS-FNA) is a safe and accurate technique to confirm the diagnosis of pancreatic cancers. Recently, numerous studies comparing the diagnostic efficacy of smear cytology (SC) and liquid-based cytology (LBC) for pancreatic lesions yielded mixed results.

Aim: To compare and identify the better cytology method for EUS-FNA in pancreatic lesions.

Methods: A comprehensive search of PubMed, Embase, and Cochrane was undertaken through July 18, 2020. The primary endpoint was diagnostic accuracy (sensitivity and specificity). Secondary outcomes included sample adequacy and post procedure complications. In addition, factors affecting diagnostic efficacy were discussed.

Results: Data on a total of 1121 comparisons from 10 studies met the inclusion criteria. Pooled rates of sensitivity for SC and LBC were 78% (67%-87%) vs 75% (67%-81%), respectively. In any case, both SC and LBC exhibited a high specificity close to 100%. Inadequate samples more often appeared in LBC compared with SC. However, the LBC samples exhibited a better visual field than SC. Very few post procedure complications were observed.

Conclusion: Our data suggested that for EUS-FNA in pancreatic lesions (particularly solid lesions), SC with Rapid On-Site Evaluation represents a superior diagnostic technique. If Rapid On-Site Evaluation is unavailable, LBC may replace smears. The diagnostic accuracy of LBC depends on different LBC techniques.

Keywords: Diagnostic efficacy; Endoscopic ultrasonography-guided fine-needle aspiration; Liquid-based cytology; Pancreas; Sensitivity and specificity; Smear cytology.

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Conflict of interest statement

Conflict-of-interest statement: No potential conflicts of interest exist.

Figures

Figure 1
Figure 1
Preferred Reporting Items for Systematic Reviews and Meta-Analyses flow chart of selection of articles for review. LBC: Liquid-based cytology; SC: Smear cytology.
Figure 2
Figure 2
Forest plots of sensitivity and specificity of smear cytology (values are presented with 95% confidence interval). CI: Confidence interval.
Figure 3
Figure 3
Forest plots of sensitivity and specificity of liquid-based cytology (values are presented with 95% confidence interval). CI: Confidence interval.
See this image and copyright information in PMC

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