Fine-needle aspiration to diagnose primary thyroid lymphomas: a systematic review and meta-analysis

in European Journal of Endocrinology
Correspondence should be addressed to L Giovanella; Email: luca.giovanella@eoc.ch
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Background

Primary thyroid lymphoma (PTL) is a rare malignancy, and its prognosis depends significantly on its early diagnosis. While fine-needle aspiration (FNA) represents the gold standard to identify differentiated thyroid carcinoma, its reliability for the detection of PTL is still unclear. Here, we conducted a systematic review and meta-analysis to evaluate the diagnostic performance of FNA in PTL.

Research design and methods

A comprehensive literature search of PubMed/MEDLINE and Scopus databases was conducted to retrieve papers reporting histologically proven PTL undergone FNA. The last search was performed in February 2018 without language and time restrictions.

Results

Thirty-two studies describing 593 PTL were included and the pooled FNA sensitivity was 0.48 (95% CI = 0.38–0.58). FNA sensitivity was 0.51 in 20 studies published before 2010 and 0.39 in those published later, 0.50 in six articles with at least 20 cases and 0.44 in nine series enrolled after 2000. This performance was similar in 12 articles including diffuse large B-cell lymphoma (0.54) and those six on marginal zone lymphoma (0.56). Remarkably, FNA sensitivity increased to 0.72 when considering also FNA reports suspicious for PTL reported in 14 articles. Heterogeneity among the series was found. Publication bias was not always detected.

Conclusions

The present meta-analysis demonstrated that FNA has low sensitivity in diagnosing PTL. However, this rate increased when considering also FNA reports suspicious for PTL, which is relevant from a clinical standpoint. This result could support indirectly the use of additional imaging and/or core biopsy when PTL is suspected.

Downloadable materials

  • Supplemental Figure 1 – Risk of bias and applicability concerns: review authors' judgements about each domain for included studies.
  • Supplemental Figure 2 – Overall pooled sensitivity of FNA in diagnosing PTL in all 32 papers.
  • Supplemental Figure 3 – Pooled FNA sensitivity in 14 articles describing the number of FNA reports as diagnostic of and suspicious for PTL separately. Both FNA reports were considered as a whole.
  • Supplemental Figure 4 – Pooled FNA sensitivity in papers with at least 20 PTL cases.

 

     European Society of Endocrinology

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Figures

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    Flow diagram of the search to retrieve eligible studies.

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    Risk of bias and applicability concerns graph: review authors’ judgments about each domain presented as percentages across included studies.

  • View in gallery

    Forest plot of detection rate (i.e. diagnostic sensitivity) of FNAC in PTL (random effect), including 95% confidence intervals, in papers published since 2010.

  • View in gallery

    Forest plot of detection rate (i.e. diagnostic sensitivity) of FNAC in PTL (random effect), including 95% confidence intervals, in articles reporting series of enrolled after 2000.

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    Forest plot of detection rate (i.e. diagnostic sensitivity) of FNAC in DLBCL (random effect), including 95% confidence intervals.

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    Forest plot of detection rate (i.e. diagnostic sensitivity) of FNAC in MALT (random effect), including 95% confidence intervals.

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