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H.I. Yoon



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    MA01 - Improvement and Implementation of Lung Cancer Screening (ID 368)

    • Event: WCLC 2016
    • Type: Mini Oral Session
    • Track: Radiology/Staging/Screening
    • Presentations: 1
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      MA01.06 - Long-Term Follow-Up of Small Pulmonary Ground-Glass Nodules Stable for 3 Years: Proper Follow-Up Period and Risk Factors for Subsequent Growth (ID 3988)

      11:30 - 11:36  |  Author(s): H.I. Yoon

      • Abstract
      • Presentation
      • Slides

      Background:
      It is uncertain how long persistent and stable ground-glass nodules (GGNs) should be followed although a minimum of 3 years is suggested. Here, we aimed to evaluate the proportion of GGNs showing subsequent growth after initial 3 years among GGNs that had been stable during the initial 3 years, and to determine clinical and radiologic factors associated with subsequent growth.

      Methods:
      We retrospectively analyzed patients who underwent further computed tomography after the initial 3-year follow-up period showing a persistent and stable GGN (at least 5-year follow-up from initial CT).

      Results:
      Between May 2003 and June 2015, 453 GGNs (438 pure GGNs and 15 part-solid GGNs) were found in 218 patients. Of the 218 patients, 14 patients had 15 GGNs showing subsequent growth after the initial 3 years during the median follow-up period of 6.4 years. For the person-based analysis, frequency of subsequent growth of GGNs that had been stable during initial 3 years was 6.7% (14/218). For the nodule-based analysis, the frequency was 3.3% (15/453). In a multivariate analysis, age ≥ 65 years (odds ratio [OR], 5.51; p = 0.012), history of lung cancer (OR, 6.44; p = 0.006), initial size ≥ 8 mm (OR, 5.74; p = 0.008), presence of a solid component (OR, 16.58; p = 0.009), and an air bronchogram (OR, 5.83; p = 0.015) were independent risk factors for subsequent GGN growth.Between May 2003 and June 2015, 453 GGNs (438 pure GGNs and 15 part-solid GGNs) were found in 218 patients. Of the 218 patients, 14 patients had 15 GGNs showing subsequent growth after the initial 3 years during the median follow-up period of 6.4 years. For the person-based analysis, frequency of subsequent growth of GGNs that had been stable during initial 3 years was 6.7% (14/218). For the nodule-based analysis, the frequency was 3.3% (15/453). In a multivariate analysis, age ≥ 65 years (odds ratio [OR], 5.51; p = 0.012), history of lung cancer (OR, 6.44; p = 0.006), initial size ≥ 8 mm (OR, 5.74; p = 0.008), presence of a solid component (OR, 16.58; p = 0.009), and an air bronchogram (OR, 5.83; p = 0.015) were independent risk factors for subsequent GGN growth.

      Conclusion:
      For the individuals with GGNs having risk factors described above, the longer follow-up period is required to confirm subsequent GGN growth.

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