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• 11946

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  P2.24 - Poster Session 2 - Supportive Care (ID 157)

  • Event: WCLC 2013
  • Type: Poster Session
  • Track: Supportive Care
  • Presentations: 1
  • Moderators:
  • Coordinates: 10/29/2013, 09:30 - 16:30, Exhibit Hall, Ground Level

  • 11994

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    P2.24-048 - Prevalence of pulmonary embolism in patients with oncogene addicted advanced lung adenocarcinoma (ID 2967)

    09:30 - 09:30  |  Author(s): V. Marconi
    • Abstract

    Background
    Non-small cell lung cancer is associated with a higher risk of thromboembolic events in comparison with SCLC. Adenocarcinoma represent roughly 75% of NSCLC patients. Lung adenocarcinomas harboring EGFR and KRAS mutations as well as EML4/ALK rearrangements represent distinct subsets of this disease. No data are available concerning the prevalence of pulmonary embolism in lung adenocarcinoma patients with these mutations. The aim of the study was to evaluate the prevalence of pulmonary embolism in patients with stage IIIB and IV lung adenocarcinomas harboring EGFR and KRAS mutations as well as EML4/ALK traslocations.

    Methods
    Patients with stage IIIB or IV NSCLC referred to Division of Medical Oncology at the Hospital of Perugia between 2008 and 2012 were included in the study. In these patients, contrast-enhanced CT scans of the chest were reviewed for the presence of pulmonary embolism by a panel composed by three radiologists. In the same patients, data regarding the molecular characteristics (EGFR exons 18-21 and KRAS exon 2 mutations as well as EML4/ALK traslocations) were collected.

    Results
    A total of 209 patients with stage IIIB or IV NSCLC were included in the study. A histologic diagnosis of lung adenocarcinoma was done in 173 patients (82.7%). In 127 of these patients sequence analysis for known EGFR (exon 18-21) and KRAS (exon 2) mutations was performed. In this population 31/173 patients were EGFR mutated (17.9%), 27/173 were K-RAS mutated (15.6 %) and 17/173 were EML4/ALK positive (9.8%). 41 patients with lung adenocarcinoma had a diagnosis of pulmonary embolism at CT scan (23.7%). Of these, 34.1% had no oncogene mutations in comparison with 28.8% of the patients without pulmonary embolism. Of the 41 patients with a diagnosis of pulmonary embolism 12.1% had an EGFR mutation and 12.1% a KRAS mutation, in comparison with 19.7% and 16.6% of patient without pulmonary embolism, respectively. In patients with lung adenocarcinoma, EML4/ALK rearrangements was observed in 19.5% among patients with pulmonary embolism and in 6.8% among patients without it. The risk of pulmonary embolism was 3.3-fold higher in presence of EML4/ALK rearrangements in comparison with no EML4/ALK rearrangements [OR: 3.3 (95%CI 1.2-9.2)].

    Conclusion
    In lung adenocarcinoma patients, the presence of EML4/ALK traslocation seems to be associated with a high risk of pulmonary embolism and could help in identifying patients at particular high risk who might benefit from an antithrombotic prophylaxis. These preliminary data need to be confirmed by further studies.

• 12853

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  P3.24 - Poster Session 3 - Supportive Care (ID 160)

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

  • 12900

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    P3.24-048 - Prevalence of unexpected pulmonary embolism at contrast-enhanced CT scan performed for cancer staging in patients with advanced lung cancer (ID 3111)

    09:30 - 09:30  |  Author(s): V. Marconi
    • Abstract

    Background
    Patients with advanced lung cancer have been reported to be at high risk for venous thromboembolism (VTE). In patients with cancer, a rate of unexpected pulmonary embolism (UPE) of about 1.5% has been reported.The aim of the study was to determine the prevalence of UPE in patients with stage IIIB or IV NSCLC or extensive SCLC who underwent CT scans for cancer staging.

    Methods
    We reviewed the contrast-enhanced CT scans of the chest performed for routine cancer staging in consecutive patients with advanced lung cancer (stage IIIB or IV NSCLC or extensive SCLC) referred to the Division of Medical Oncology at the hospital of Perugia between 2008 and 2012. All CT scans were reviewed by an ad hoc panel composed by 3 radiologists. PE was defined as unexpected when a filling defect in central, lobar, segmental or sub-segmental pulmonary arteries was observed in absence of clinical suspicion of PE.

    Results
    Overall, 223 patients were included in the analysis: 180 patients with stage IV-NSCLC, 24 patients with stage IIIB-NSCLC, and 19 patients with extensive SCLC. A total of 899 CT scans were reviewed. The prevalence of UPE was 19.7% (44/223): 34 (77.3%) in patients with stage IV-NSCLC, 7 (15.9%) in patients with stage IIIB-NSCLC, and 3 (6.8%) in patients with advanced SCLC. Patients with UPE were 26 males and 18 females and had a mean age of 58 years (range 24-78). UPE was monolateral in 30 patients and bilateral in 14 patients. UPE involved central pulmonary arteries in 6 patients, lobar arteries in 16 patients and segmental arteries in 19 patients. 3 patients had an isolated sub-segmental UPE. The mean time between cancer diagnosis and UPE was 11.8 months. 27% of cancer patients with UPE had the positive CT scan at diagnosis and 50% within 3 months. A recurrence of UPE was observed in one patient.

    Conclusion
    Patients with stage IIIB or IV NSCLC or extensive SCLC have a high rate of UPE at CT scan performed for cancer staging. UPE was bilateral in about one third of patients. A minority of UPE involved isolated sub-segmental arteries.