|Year : 2020 | Volume
| Issue : 3 | Page : 167-174
Comparison between 22G aspiration and 22G biopsy needles for EUS-guided sampling of pancreatic lesions: A meta-analysis
Antonio Facciorusso1, Harshvardhan Singh Bajwa2, Kavitha Menon3, Vincenzo Rosario Buccino1, Nicola Muscatiello1
1 Department of Medical Sciences, Gastroenterology Unit, University of Foggia, Foggia, Italy
2 Department of Community Medicine, Dr Rajendra Prasad Government Medical College, Kangra, Himachal Pradesh, India
3 Department of Public Health, Sardar Patel Institute Campus, Ahmedabad, Gujarat, India
|Date of Submission||21-Nov-2018|
|Date of Acceptance||03-Jan-2019|
|Date of Web Publication||26-Apr-2019|
Dr. Antonio Facciorusso
Department of Medical Sciences, Gastroenterology Unit, University of Foggia, AOU Ospedali Riuniti, Viale Pinto, 1, Foggia 71100, Italy
Source of Support: None, Conflict of Interest: None
Background and Objective: Robust data in favor of clear superiority of 22G fine-needle biopsy (FNB) over 22G FNA for an echoendoscopic-guided sampling of pancreatic masses are lacking. The objective of this study is to compare the diagnostic outcomes and sample adequacy of these two needles. Materials and Methods: Computerized bibliographic search on the main databases was performed and restricted to only randomized controlled trials. Summary estimates were expressed regarding risk ratio (RR) and 95% confidence interval. Results: A total of 11 trials with 833 patients were analyzed. The two needles resulted comparable in terms of diagnostic accuracy (RR 1.02, 0.97–1.08; P = 0.46), sample adequacy (RR 1.01, 0.96–1.06; P = 0.61), and histological core procurement (RR 1.01, 0.89–1.15; P = 0.86). Pooled sensitivity in the diagnosis of pancreatic cancer was 93.1% (87.9%–98.4%) and 90.4% (86.3%–94.5%) with biopsy and aspirate, respectively, whereas specificity for detecting pancreatic cancer was 100% with both needles. Analysis of the number of needle passes showed a nonsignificantly positive trend in favor of FNB (mean difference: −0.32, −0.66–0.02; P = 0.07). Conclusion: Our meta-analysis stands for a nonsuperiority of 22G FNB over 22G FNA; hence, no definitive recommendations on the use of a particular device can be made.
Keywords: Accuracy, EUS, FNA, fine-needle biopsy, pancreas, sensitivity
|How to cite this article:|
Facciorusso A, Bajwa HS, Menon K, Buccino VR, Muscatiello N. Comparison between 22G aspiration and 22G biopsy needles for EUS-guided sampling of pancreatic lesions: A meta-analysis. Endosc Ultrasound 2020;9:167-74
|How to cite this URL:|
Facciorusso A, Bajwa HS, Menon K, Buccino VR, Muscatiello N. Comparison between 22G aspiration and 22G biopsy needles for EUS-guided sampling of pancreatic lesions: A meta-analysis. Endosc Ultrasound [serial online] 2020 [cited 2020 Nov 24];9:167-74. Available from: http://www.eusjournal.com/text.asp?2020/9/3/167/257292
| Introduction|| |
EUS represents a valuable and accurate diagnostic technique for the morphological characterization of the pancreatic lesions; furthermore, EUS allows sampling of the pancreatic tissue for cytopathological and histological diagnosis using FNA and more recently, fine-needle biopsy (FNB).,
In spite of the good results observed with EUS-FNA and the recent developments in this field, such as the use of rapid on-site evaluation (ROSE), contrast-enhanced guided FNA or tissue elastography, and diagnostic sensitivity remains an issue. Among the most commonly adopted devices, 22G and 25G FNA needles have proved equally effective and safe in clinical practice, and consequently, they represent the current standard of care when performing sampling of pancreatic masses.,
Cellular acquisition through EUS-FNA does not necessarily retain the stroma or associated architecture of the surrounding tissue, which may be necessary to provide a definitive diagnosis. EUS-FNB, which typically uses a core biopsy needle and preserves the cellular architecture, has become an increasingly useful tool in establishing a definitive diagnosis of malignancy. Obtaining a complete histologic sample is, particularly of the interest in light of the advent of molecular profiling and novel personalized oncologic therapies; furthermore, EUS-FNB accuracy seems less prone to be influenced by the absence of ROSE or to be dependent on a high number of needle passes.
Two recent meta-analyses reached the conclusion that EUS-FNB needles show comparable diagnostic accuracy and sample adequacy in comparison to EUS-FNA but with the need of a lower number of passes.,
However, these meta-analyses included both randomized controlled trials (RCTs) and retrospective studies, and they did not focus only on pancreatic masses but considered also other abdominal lesions or lymph nodes; moreover, subgroup analysis according to the needle size was not performed; hence, heterogeneity of the results calls for a note of caution in interpreting their findings. Since EUS-FNB of the pancreatic lesions is commonly performed with 22G needle and currently available RCTs tested prevalently this specific device, we decided to compare 22G EUS-FNB with 22G EUS-FNA for the diagnosis of the pancreatic solid lesions. To maximize the reliability of our conclusions and to obviate to the heterogeneity found in previous systematic reviews,, we decided to restrict our analysis to only RCTs comparing these two-needle sizes.
Primary endpoint was diagnostic accuracy. Secondary outcomes were sample adequacy, optimal histological core procurement, the mean number of needle passes, and pooled specificity and sensitivity. Safety data and technical success rate were also analyzed.
| Materials and Methods|| |
Inclusion and exclusion criteria
Only studies meeting the following criteria were included: (1) RCTs comparing EUS-FNA and EUS-FNB with 22G needle of pancreatic solid lesions; (2) Studies published in English; and (3) Articles reporting at least one of the following outcomes: diagnostic accuracy (or data useful for its calculation), sample adequacy (or data useful for its calculation), and histologic core procurement.
[Figure 1] reports the search strategy followed in the meta-analysis.
Bibliographic research was conducted on PubMed, EMBASE, Cochrane Library, and Google Scholar, including all studies fulfilling inclusion criteria published until November 2018. The following search strategy was adopted: ([EUS [MeSH Terms] AND eus [MeSH Terms] OR biopsy [MeSH Terms] OR fna [MeSH Terms]) AND pancreas (MeSH Terms).
Relevant reviews and meta-analyses on the use of EUS in pancreatic solid lesions were examined for potential suitable studies. Authors of included studies were contacted to obtain full text or further information when needed.
Data extraction was conducted by two reviewers (atrial fibrillation [AF] and HSB) using a standardized approach (the PRISMA statement). The quality of included studies was assessed by two authors independently (AF, KM) according to the currently accepted criteria described elsewhere. Disagreements were solved by discussion and following a third opinion (NM).
Chi-square and I2 tests were used for across studies comparison of the percentage of variability attributable to heterogeneity beyond chance. A value of P < 0.10 for Chi-square test and I2 <20% were interpreted as low-level heterogeneity.
As recommended by recent Cochrane guidelines, random-effects model with DerSimonian–Laird test was chosen a priori for all analyses (regardless of the level of heterogeneity), and then fixed-effect model by means of Mantel–Haenszel test was performed as a sensitivity test. Summary estimates were expressed regarding risk ratio (RR) and 95% confidence interval (CI).
Primary endpoint was diagnostic accuracy, defined as true positive + true negative/total number of patients.
Among secondary outcomes, sample adequacy (rate of adequate samples on the total number of patients), optimal histological core procurement rate, and the mean number of needle passes were compared between the two groups, whereas specificity (true negative/true negative + false positive) and sensitivity (true positive/true positive + false negative) were separately pooled for each needle. Safety data and technical success rate were inconsistently reported; hence, they were analyzed descriptively.
The probability of publication bias was assessed using funnel plots and with Begg and Mazumdar test. Sensitivity analysis was conducted according to the quality of included studies, study design (parallel vs. cross-over), and several technical characteristics (use of stylet, ROSE, suction, and type of needle).
All statistical analyses were conducted using RevMan version 5 (the Cochrane Collaboration, Oxford, UK) and Open Meta (Analyst) software (freely available at the site: http://www.cebm.brown.edu/openmeta). For all calculations, a two-tailed P < 0.05 was considered statistically significant.
| Results|| |
Characteristics of included studies
As shown in [Figure 1], out of 2001 studies initially identified, after preliminary exclusion of papers not fulfilling inclusion criteria, 14 potentially relevant RCTs were examined. Among these studies, three were excluded because they did not report subgroup analysis on pancreatic lesions or with 22G needles or due to comparison of different kinds of the same needle.
Finally, 11 RCTs,,,,,,,,,, with 833 patients (239 sampled with 22 G EUS-FNB, 271 with 22 G EUS-FNA, and 323 with both needles in cross-over trials) were included in the meta-analysis.
The main characteristics of included studies are reported in [Table 1].
The recruitment period ranged from 2011 to 2016. Five RCTs,,,, were parallel trials and six,,,,, were cross-over studies (thus meaning that the same lesion was sampled with both needles in a randomized order). Four RCTs were conducted in Asia,,, and all studies presented two well-balanced arms regarding lesion features (location and size) and clinical-demographical characteristics [Table 1]. ROSE was available in three studies, all conducted in the USA.,, FNB needle was ProCore® in all studies except that by Bang et al. where Acquire® was used.
Quality was deemed high in five RCTs,,,,, and moderate or low in the other six trials.,,,,,
Details on methodological characteristics and quality of included articles are shown in [Supplementary Figure 1 [Additional file 1]]a and [Supplementary Figure 1]b.
Diagnostic accuracy, sensitivity, and specificity
As depicted in [Figure 2], the two needles resulted comparable regarding diagnostic accuracy (RR 1.02, 95% CI 0.97–1.08; P = 0.46) with moderate evidence of heterogeneity (I2 = 32%). There was no evidence of publication bias [Supplementary Figure 2 [Additional file 2]]. The findings of main analysis were confirmed in the sensitivity analysis performed according to the study design, quality, and several technical characteristics of the procedure [Table 2]. Of note, ROSE was the main responsible of heterogeneity found as restricting the analysis to only studies not using ROSE led to robust results with I2 = 0 [Table 2] and [Supplementary Figure 3 [Additional file 3]]a and [Supplementary Figure 3]b.
|Figure 2: Meta-analysis comparing the diagnostic accuracy of 22G fine-needle biopsy and 22G FNA. The two needles resulted comparable regarding diagnostic accuracy (risk ratio 1.02, 95% confidence interval 0.97-1.08; P = 0.46) with moderate evidence of heterogeneity (I2 = 32%)|
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Four trials,,, reported sensitivity and specificity; hence, their results were pooled as depicted in [Supplementary Figure 4 [Additional file 4]] and [Supplementary Figure 5 [Additional file 5]]. In details, pooled sensitivity in the diagnosis of pancreatic cancer of 22G FNB needle was 93.1% (87.9%–98.4%), whereas 22G FNA needle showed 90.4% (86.3%–94.5%) sensitivity [Supplementary Figure 4]a and [Supplementary Figure 4]b. On the other hand, pooled specificity for detecting pancreatic cancer was 100% with both needles [Supplementary Figure 5]a and [Supplementary Figure 5]b.
Sample adequacy and optimal histologic core procurement
The forest plot of the comparison of sample adequacy is reported in [Figure 3]. RR for sample adequacy was very close to 1 with only a slight increase in favor of 22G FNB (1.01, 0.96–1.06; P = 0.61). Moderate evidence of heterogeneity was observed (I2 = 37%, Chi2 = 12.7, df = 8; P = 0.12) [Figure 3].
|Figure 3. Meta-analysis comparing sample adequacy of 22G fine-needle biopsy and 22G FNA. Risk ratio for sample adequacy was very close to 1 with only a slight increase in favor of 22G FNB (P = 0.61). Moderate evidence of heterogeneity was observed (I2 = 37%)|
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No evidence of publication bias was observed, as confirmed with Begg and Mazumdar test (P = 0.64).
Similar results were observed when comparing histologic core procurement rate [Supplementary Figure 6 [Additional file 6]]. In fact, RR was 1.01 (0.89–1.15; P = 0.86) with high evidence of heterogeneity (I2 = 77%). Of note, analysis restricted to the only trial using Franseen biopsy needle (Acquire®) showed significant benefit regarding higher quality histologic yield (RR 1.18, 1.03–1.36; P = 0.02).
Number of passes and adverse events
Analysis of a number of needle passes needed to obtain adequate sample showed a nonsignificantly positive trend in favor of FNB (mean difference: −0.32, −0.66–0.02; P = 0.07) with high evidence of heterogeneity (I2 = 89%) [Figure 4]. Again, ROSE was the main responsible of heterogeneity as restricting the analysis to trials using on-site cytologic evaluation,, confirmed main results but with a significant drop in heterogeneity (I2 = 38%) [Supplementary Figure 7 [Additional file 7]]a and [Supplementary Figure 7]b.
|Figure 4. Meta-analysis comparing mean number of needle passes of 22G fine-needle biopsy and 22G FNA. Analysis of number of needle passes needed to obtain adequate sample showed a nonsignificantly positive trend in favor of FNB (mean difference: −0.32, −0.66-0.02; P = 0.07) with high evidence of heterogeneity (I2 = 89%)|
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Details on the safety profile of the two devices are reported in [Supplementary Table 1 [Additional file 8]]. Out of a total of six adverse events reported, five were experienced by patients treated with 22G FNA needles while only one event was caused by a 22G FNB needle. Of note, all of the reported adverse events (mainly bleeding) were mild and did not impact on patient outcomes.
Technical failure was observed twice with FNB needle (both in the study by Othman et al.) and only once with FNA needle.
| Discussion|| |
EUS-guided tissue sampling plays a pivotal role in the diagnostic algorithm of solid pancreatic lesions, but its diagnostic accuracy is strictly dependent on a series of tumor-related features (such as lesion size, number, and histological type) and technical variables such as needles adopted, number of passes or availability of an on-site pathologist in the endoscopic room for evaluation of sample adequacy. To overcome at least partially these limitations and given the pressing need of adequate histological samples for molecular analysis, biopsy needles have been developed and introduced in the clinical practice.
The first flexible biopsy needle (Quick-Core®) was introduced in the early 2000s and adapted from the Tru-Cut design, but its performances were impaired by several technical issues such as challenges in deploying the spring-loaded tray when in torqued positions within the duodenum, as well as loss of specimen when the needle was withdrawn. As a consequence, tru-cut needle failed to determine a significant increase in diagnostic outcomes as compared to standard FNA needles, thus limiting its use worldwide.
Although ProCore® biopsy needle seems to address most of the limitations of previous biopsy devices, thanks to the addition of a reverse bevel just distal to the tip promoting collection of a core sample, no significant differences in adequate tissue acquisition, diagnostic accuracy, and rate of histological core specimen acquisition were seen with a significantly lower number of passes being the only advantage observed with FNB as compared to standard FNA.,
Given the recent development of novel FNB needle designs (such as Acquire®) and since previous meta-analyses provided highly heterogeneous findings due to different study designs, needle sizes and locations of the lesions sampled, there is a clear need to address properly this issue (which represents a quality item of paramount importance in EUS) with a systematic review of only RCTs focused on pancreatic masses and comparing an univocal needle size, namely, 22G which is far the most tested in the literature.
With a meta-analysis of 11 RCTs selectively comparing 22G FNB and 22G FNA in the pancreatic masses, we made several key observations. First, the two needles resulted in comparable regarding either diagnostic accuracy (RR 1.02, P = 0.46) and sample adequacy (RR 1.01, P = 0.61). Similarly, histologic core procurement rate (RR 1.01, P = 0.86) and pooled sensitivity were similar with both devices (93.1% with FNB and 90.4% with FNA). As expected, pooled specificity was 100% with both needles. Second, sensitivity analysis confirmed these findings in all settings and availability of ROSE was found to be major source of heterogeneity observed in main analysis. However, FNA led to competitive results in comparison to FNB even in the absence of ROSE (not available in most non-American series). Third, while ProCore® did not result in a clear advantage regarding accuracy and adequate tissue sampling, Franseen biopsy needle (Acquire®) showed significant benefit concerning high quality histologic yield (RR 1.18, P = 0.02) although this finding is based on a single American study and requires further confirmation. Fourth, unlike the aforementioned meta-analyses, where a number of needle passes was found to be significantly lower with FNB, our analysis showed only a nonsignificantly positive trend (mean difference:−0.32, P = 0.07) with high evidence of heterogeneity; again, ROSE was the main source of heterogeneity. Finally, both devices were safe and easy to use as adverse events and technical failure were rarely reported and did not impact on the patient clinical course.
As our analysis was restricted to RCTs; hence not influenced by any selection or outcome reporting bias, the theoretical advantages of 22G FNB needles do not result significantly in clinical practice and the diagnostic outcomes of the two devices can, therefore, be considered comparable, even concerning histological core procurement and number of passes which should be the main advantages of FNB.
The promising results observed with the Franseen needle (Acquire®) may be due to its three-point cutting surface designed to provide improved control at the puncture site and stability at the tip, allowing for enhanced penetration. Other new-generation FNB needles are actually available in clinical practice such as Fork-tip needle (SharkCore®) which was proved to be competitive with Franseen device in a recent head-to-head clinical trial. The same striking results were confirmed in a retrospective real-life American series comparing both needles with standard FNA. Again, it should be stated expressly that our results apply to 22G needles in pancreatic masses, while further studies with other needle calipers and in different abdominal lesions are warranted to draw more general assumptions.
There are some limitations to the present study. First, the low number of included studies and enrolled patients require particular caution in interpreting our findings. However, we deliberately decided to restrict inclusion criteria to only RCTs comparing specifically 22G needles to provide more robust and homogenous outcome estimates. Moreover, all main outcomes (sensitivity, specificity, diagnostic accuracy, sample adequacy, histologic procurement, and safety profile) were explored, and this aspect represents a nearly unique analysis in this field. Second, there are other technical aspects such as the use of stylet, ROSE availability, or a number of passes which may influence diagnostic accuracy of the procedure. By the way, all of these technical features were explored as eventual sources of heterogeneity through dedicated sensitivity analyses and as expected, ROSE availability was found as a potential cause of heterogeneity. As previously commented, ProCore® needle failed to lead to significant accuracy improvement even in the absence of ROSE, when FNA would be expected to result more poorly performant.
| Conclusion|| |
Despite these weaknesses, our meta-analysis stands for a nonsuperiority of 22G FNB over 22G FNA; hence, no definitive suggestions on the use of a particular device may be actually provided. New-generation devices seem very promising but need to be explored in further RCTs.
Supplementary information is linked to the online version of the paper on the Endoscopic Ultrasound website.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4]
[Table 1], [Table 2]
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