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N. Yanagawa



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    MINI 06 - Quality/Prognosis/Survival (ID 111)

    • Event: WCLC 2015
    • Type: Mini Oral
    • Track: Treatment of Localized Disease - NSCLC
    • Presentations: 1
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      MINI06.09 - Aerogeneous Spread Is a Predictive Factor of Recurrence in Stage I Lung Adenocarcinoma (ID 248)

      17:30 - 17:35  |  Author(s): N. Yanagawa

      • Abstract
      • Presentation
      • Slides

      Background:
      Previously, aerogeneous spread with floating cancer cell clusters (ASFC) was a prognostic factor and significantly related with local recurrence of the surgical margin after metastatic lung tumor (Shiono, Ann Thorac Surg 2005). However, ASFC in surgically resected lung cancer has not been investigated well. Since our institute examined ASFC in resected lung cancer specimens prospectively, we assessed the prognostic impact of ASFC and local recurrence in stage I lung adenocarcinoma cases.

      Methods:
      From July 2004 to November 2014, a total of 877 lung cancer patients underwent a surgery. Among them, 318 patients with pathological stage I adenocarcinoma cases were reviewed. We investigated the characteristics of ASFC and analyzed the relationship between ASFC and prognosis. The patients who received preoperative treatment or had multiple lung cancers were excluded.

      Results:
      Median follow-up time was 28 months. Of the 318 patients, 47 (14.8%) patients had ASFC. The local recurrence rate was 11 of 47 (23.4%) cases with ASFC and 10 of 271 (3.7%) cases without (p < 0.01). All 4 cases developing surgical stump recurrence had an ASFC. In patients with ASFC, the ratio of male, smoker, EGFR mutation negative, lymphovascular and pleural invasion were significantly high (p < 0.01). Standardized uptake value (SUV) (p < 0.01) was also significantly higher in ASFC positive cases. Surgical procedure did not influence development of ASFC. Multivariate analysis revealed that the ASFC were significantly related with EGFR negative mutation and lymphovascular invasion. As preoperative predictive factors for ASFC, SUV was a significant predictive factor (p = 0.01). Univariate analysis showed that overall 5-year survival of cases with ASFC was 62.7% and without was 91.1% (p < 0.01) and recurrence free 5-year survival of cases with ASFC was 54.4% and without 87.8% (p < 0.01). Multivariate analysis showed that age, pleural invasion and ASFC were significant prognostic factors for overall survival, and that these factors were significantly related to cancer recurrence after surgery.Figure 1



      Conclusion:
      In p-stage-I lung adenocarcinoma patients, ASFC was frequently found in invasive lung adenocarcinoma cases. Therefore, characteristics of these lung cancers may develop a poor prognosis. PET scan might have effective radiological examinations to find a lung adenocarcinoma with ASFC.

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