Comparative diagnostic performance of different techniques for EUS-guided fine-needle biopsy sampling of solid pancreatic masses: a network meta-analysis

Background and Aims: Evidence is limited on the comparative diagnostic performance of tissue sampling tech-niques for EUS-guided fine-needle biopsy sampling of pancreatic masses. We performed a systematic review with network meta-analysis to compare these techniques. Methods: Rates of sample adequacy, blood contamination, and tissue integrity using fine-needle biopsy sampling needles were evaluated. Direct and indirect comparisons were performed among the slow-pull, dry-suction, modi-fied wet-suction, or no-suction techniques. Results are expressed as risk ratio (RR) and 95% confidence interval (CI). Results: Overall, 9 randomized controlled trials (756 patients) were identified. On network meta-analysis, the no -suction technique was significantly inferior to the other techniques (RR, .85 [95% CI, .78-.92] vs slow pull; RR, .85 [95% CI, .78-.92] vs dry suction; RR, .83 [95% CI, .76-.90] vs modified wet suction) in terms of sample adequacy. Consequently, modified wet suction was shown to be the best technique (surface under the cumulative ranking curve score, .90), with the no-suction technique showing poorer performance in terms of sample adequacy (sur-face under the cumulative ranking curve score, .14). Dry suction was associated with significantly higher rates of blood contamination as compared with the slow-pull technique (RR, 1.44; 95% CI, 1.15-1.80), whereas no suction led to less blood contamination of samples in comparison with other techniques (RR, .71 [95% CI, .52-.97] vs slow pull; RR, .49 [95% CI, .36-.66] vs dry suction; RR, .57 [95% CI, .40-.81] vs modified wet suction). The modified wet -suction technique significantly outperformed dry suction in terms of tissue integrity of the sample (RR, 1.36; 95% CI, 1.06-1.75). Conclusions: Modified wet suction seemed to provide high rates of integrity and adequate samples, albeit with high blood contamination. The no-suction technique performed significantly worse than other sampling strate-gies. (Gastrointest Endosc 2023;97:839-48.)

Automated summary

A systematic review and network meta-analysis compared tissue sampling techniques for EUS-guided fine-needle biopsy of pancreatic masses. The modified wet suction technique showed the highest sample adequacy, while the no-suction technique performed the worst. Dry suction had higher rates of blood contamination compared to slow-pull technique, but no suction resulted in less blood contamination. The modified wet-suction technique also had better tissue integrity than dry suction.