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  MA09 - Lung Cancer Surgical and Molecular Pathology (ID 908)

  • Event: WCLC 2018
  • Type: Mini Oral Abstract Session
  • Track: Pathology
  • Presentations: 1
  • Moderators:
  • Coordinates: 9/24/2018, 15:15 - 16:45, Room 202 BD

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    MA09.05 - Can We Predict Radiosensitivity in Non-Small Cell Lung Cancer? (ID 13835)

    15:45 - 15:50  |  Author(s): Christopher Talbot
    • Abstract
    • Presentation
    • Slides

    Background
    

    Patients with lung cancer receive different treatments depending on their detailed clinical-pathological context. However, over 70% of patients are treated with radiotherapy, which is of varying efficacy. Rather surprisingly, no biomarkers are currently used to predict tumour response and to aid with radiotherapy dosing or regimen. The aim of this study is to identify histopathological features which may predict tumour radiosensitivity in patients with NSCLC.

    a9ded1e5ce5d75814730bb4caaf49419 Method
    

    We have identified a set of 67 NSCLC cases with a history of radiotherapy for which pre-treatment archival tissue and CT imaging follow-up is available from the period 2009 to 2014. Digital images of archival diagnostic tissue sections were examined to derive morphological measures with the potential to predict radiosensitivity. Quantitative radiological measures of response up to 6 months after radiotherapy were derived. Since radiographic measurements were taken at variable time-points, we standardised by inferring the fractional maximum diameter of the tumour 100 days after radiotherapy (FRT100)

    4c3880bb027f159e801041b1021e88e8 Result
    

    The density of multipolar mitoses seen microscopically is related to radiosensitivity (regression against FRT100: R² = 0.14, p=0.005*) and a trend toward a negative relationship with neuroendocrine differentiation (R² =0.06, p=0.058). The presence of multipolar mitoses was further associated with poor overall survival ( Univariate Cox p= 0.02*). Patients with radiological evidence of good response (ie low FRT100) showed a time-dependent survival benefit (p=0.02*), while after 2 years tendency of both groups was similar. Patients showing squamous differentiation had a poor prognosis, with no overall survival after 4 years, while 21.8% of the ACA were still alive after 4 years (p= 0.04*)

    8eea62084ca7e541d918e823422bd82e Conclusion
    

    Multipolar mitoses and neuroendocrine differentiation may be predictive histological markers of radiosensitivity in NSCLC. More samples are being gathered, and immhunohistochemical and DNA sequence biomarkers of radiosensitvity are currently being assessed.

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