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ChunXue Bai



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    P1.11 - Screening and Early Detection (Not CME Accredited Session) (ID 943)

    • Event: WCLC 2018
    • Type: Poster Viewing in the Exhibit Hall
    • Track:
    • Presentations: 1
    • Moderators:
    • Coordinates: 9/24/2018, 16:45 - 18:00, Exhibit Hall
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      P1.11-01 - The NELSON Triage Algorithm Applied to a Chinese Biopsied Population: A Pilot Study (ID 12115)

      16:45 - 18:00  |  Author(s): ChunXue Bai

      • Abstract
      • Slides

      Background

      The Nederlands-Leuvens Longkanker Screenings Onderzoek (NELSON) lung cancer screening study sequentially tests nodules’ volume, growth and doubling time with an increasing screening interval length. For now, classification performances of NELSON are known only for a European population with specific eligibility criteria.

      We tested the NELSON trial triage algorithm on a cohort of biopsied Chinese patients.

      Method

      Our study utilized a data subset from the NCT02693496 clinical trial. The data consisted of onsite prospective evaluations of 85 Chinese patients who underwent CTs within an average time interval of 259 days (Min=63; Max=1092). NCT02693496 readers applied the Chinese consensus low-dose CT management guidelines with referral to biopsy, when required.

      The eligibility criteria were: All genders; age: 18 to 90 years old; chest lesion <3cm. Smoking status was not considered.

      In our subset of 85 patients, 15 nodules from 15 patients were biopsied: 10 were confirmed malignant; of these, 3 were solid nodules (SN) and 7 were sub-solid nodules (SSN). Five biopsied nodules were confirmed benign. Of the whole cohort, 11.8% (10/85), were declared positive patients. The 75/85 others (88.2%) were declared negative by radiologists and/or pathologists.

      Using the Lesion Management Solution (LMS) platform (Median Technologies), we retrospectively re-processed the subset of images to analyze NELSON sensitivity at detecting malignant lung nodules. We used R CRAN software for statistics and Chi-Squared test for non-parametric comparison of two sample proportions.

      Result

      We found 12.9% of patients (11/85) displayed no findings. There were 155 detected findings in the remaining 74 patients, which were documented as: 5.2% (8/155) benign as NODCAT I; 9.0% (14/155) pleural; 27.7% (43/155) SSN and 58.1% (90/155) SN. According to NELSON triage, five Patients were declared positive.

      In the biopsy-confirmed nodules group (10 patients), four were detected by NELSON, one at baseline.

      All patients displaying SNs were detected (3/3) whereas only one (1/6) patient displaying SSNs was detected. NELSON was better at detecting SNs (p=0.036).

      One patient with confirmed negative biopsy patient (1/5) was declared positive by NELSON with one SN and one SSN.

      Additionally, one SN in patient without biopsy was declared positive at baseline by NELSON triage algorithm.

      Conclusion

      Prevalence of different nodule types in this Chinese population was different from the observations of the original European NELSON trial. The NELSON triage algorithm correctly classified patients with malignant SNs but misclassified most patients displaying SSNs. Further studies are needed to better evaluate SSNs by NELSON.

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