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S. Abbas



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    MINI 24 - Epidemiology, Early Detection, Biology (ID 140)

    • Event: WCLC 2015
    • Type: Mini Oral
    • Track: Thymoma, Mesothelioma and Other Thoracic Malignancies
    • Presentations: 1
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      MINI24.07 - Infrared Spectroscopy as a Novel Approach in Differential Diagnosis of Malignant Pleural Mesothelioma from Lung Cancer Using Pleural Fluid (ID 2601)

      17:20 - 17:25  |  Author(s): S. Abbas

      • Abstract
      • Slides

      Background:
      Malignant pleural mesothelioma (MPM) is an aggressive and rare form of cancer which arises from mesothelial cells lining pleural cavity. Since it is difficult to differentiate the benign pleural thickenings from carcinomas, MPM can only be diagnosed in the advanced stage. To decrease the mortality rate of this disease highly sensitive and specific diagnostic methods are required. In the current study we propose Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) spectroscopy coupled with chemometrics as a novel approach in diagnosis of MPM from pleural fluids with better sensitivity and specificity values than the other biomarker analysis methods that are currently used.

      Methods:
      The pleural fluid samples from MPM (n=24), lung cancer (LC, n=20) and benign transudate (BT, n=20) patients were collected to perform FTIR spectroscopic experiments. Recording and analysis of the spectral data were performed by using Spectrum One software. Unsupervised chemometric analysis methods including hierarchical cluster (HCA) and principal component analysis (PCA) were applied to discriminate MPM from BT and LC groups. To develop a diagnostic method, SIMCA, a supervised chemometric method was also performed.

      Results:
      Quantitative spectral analysis indicated that lipid, triglyceride, cholesterol ester, protein and nucleic acid contents of MPM group differ from BT and LC groups. The score plots obtained from PCA analysis of pleural fluid at whole (4000-650 cm[-1]), lipid (3000-2800 cm[-1]) and fingerprint (1800-650 cm[-1]) spectral regions showed that BT, LC and MPM groups are successfully discriminated from each other (fig 1.).Figure 1 Figure 1. PCA scatter plots for all BT, LC and MPM pleural fluid samples in the 4000–650 cm-1 spectral region. Moreover, the loading plots obtained from these spectral regions supported the differences in molecular content of all three groups. SIMCA results performed at whole and fingerprint regions also revealed high accuracy values for the diagnosis of MPM and LC.



      Conclusion:
      The results demonstrated that ATR-FTIR spectroscopy together with chemometric tools can be used for successful and rapid differential diagnosis of MPM from LC and BT groups . *This work was supported by the Scientific and Technical Research Council of Turkey (TUBITAK), SBAG-113S294 Research Fund.

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