Non-diagnostic Results of Percutaneous Transthoracic Needle Biopsy: A Meta-analysis

Non-diagnostic results can affect the diagnostic performance of percutaneous transthoracic needle biopsy (PTNB) but have not been critically meta-analyzed yet. To meta-analyze the incidence and malignancy rate of non-diagnostic results, 3-by-2 table approaches rather than the conventional 2-by-2 approaches are needed to know its impact on the diagnostic performance of PTNB. A systematic literature search identified studies evaluating the diagnostic performance of PTNB with extractable outcomes. A total of 143 studies with 35,059 biopsies were included. The pooled incidence of non-diagnostic results was 6.8% (95% CI, 6.0–7.6%; I 2 = 0.91). The pooled malignancy rate of non-diagnostic results was 59.3% (95% CI, 51.7–66.8%; I 2 = 0.80), and was correlated with the prevalence of malignancy (correlation coefficient, 0.66; 95% CI, 0.42–0.91). Pooled percentage decrease of sensitivity and specificity due to non-diagnostic results were 4.5% (95% CI, 3.2–5.7%; I 2 = 0.64) and 10.7% (95% CI, 7.7–13.7%; I 2 = 0.70), respectively, and the pooled incidence of non-diagnostic results was 4.4% (95% CI, 3.2–5.8%; I 2 = 0.83) in lesions ultimately diagnosed as malignancies and 10.4% (95% CI, 7.5–13.8%; I 2 = 0.74) in benign disease. In conclusion, non-diagnostic results averagely occurred in 6.8% of PTNB and more than half of the results were malignancies. The non-diagnostic results decreased specificity and sensitivity by 10.7% and 4.5%, respectively, demanding efforts to minimize the non-diagnostic results in PTNB.