Author of

• 12791

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  P3.19 - Poster Session 3 - Imaging (ID 181)

  • Event: WCLC 2013
  • Type: Poster Session
  • Track: Imaging, Staging & Screening
  • Presentations: 1
  • Moderators:
  • Coordinates: 10/30/2013, 09:30 - 16:30, Exhibit Hall, Ground Level

  • 12806

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    P3.19-015 - Should core biopsy with larger needle replace FNAB in assessing lung masses? (ID 2331)

    09:30 - 09:30  |  Author(s): I. Garetto
    • Abstract

    Background
    The distinction between SCLC and NSCLC has been recently replaced by a more detailed re-classification. As 70% of patients with LC are still not eligible for surgery, tumor characterization is often based on needle biopsy. For the management of lung masses (LM), the availability of adequate samples is critical not only for pathological diagnosis, but also for additional molecular studies. In this context, our aim was to evaluate the safety and accuracy of image-guided core biopsies (CB) in our last 4-year series.

    Methods
    480 consecutive patients (325 male; 33-87 y, mean 68; LM diameter 6-150 mm, m 37,4) underwent 439 CT-guided, 35 US-guided and 6 US+CT-guided lung biopsies. In 325/480 cases (68%) a CB was preferred due to the possible requirement of molecular studies. 275 CB were performed with >=18G tru-cut needle, 50 with <18G, both by a coaxial technique (inserted in a 1G larger styleted cannula). 1 to 6 sampling per patient (m 1.5) were performed. Adverse events (including major complications) were recorded and correlated with technical issues (namely, with needle size). To assess the accuracy of CB, surgical specimens, outcome of non-surgical therapy and follow-up imaging were considered as gold standards. Sensitivity, specificity, diagnostic accuracy and positive and negative predictive values of CB were calculated.

    Results
    81/325 (24.9%) adverse events occurred, but only 23 (7%) were major complications (MC) (22 pneumothorax and 1 hemothorax, requiring drainage and prolonged hospitalization). The incidence of MC wasn’t different between either CB and FNAB group (11/155, 7%), or larger and smaller CB needle size (20/275 vs. 3/50, p=n.s). Only the depth of the LM seemed to be significant as negative predictor for MC (p=.0061). Pathological diagnosis was of benign LM in 60 CB (18.4%), malignancy in 265 (81.5%). According to the above gold standard criteria, TP were 265, FN 13, TN 47, FP 0. Sensitivity, specificity and diagnostic accuracy were 95.3%, 100% and 96%, respectively. PPV was 100%, NPV 78.3%.

    Conclusion
    CB is as safe as FNAB in characterizing LM; particularly, needle size doesn’t impact on MC rate. CB is highly accurate in morphological characterization of LM, also providing additional tissue for molecular studies, when needed.