Interobserver agreement in the nuclear grading of primary pulmonary adenocarcinoma

Yoshimasa Nakazato, Akiko Miyagi Maeshima, Yuichi Ishikawa, Yasushi Yatabe, Junya Fukuoka, Tomoyuki Yokose, Yasuhiko Tomita, Yuko Minami, Hisao Asamura, Keisei Tachibana, Tomoyuki Goya, Masayuki Noguchi

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30 Citations (Scopus)


Introduction: Nuclear grading involves an evaluation of the size and shape of nuclei and the percentage of tumor cells that are in the mitotic phase. To estimate the degree of aggressiveness, this approach has been applied to various types of carcinomas, such as breast carcinoma and pulmonary adenocarcinoma (Nakazato et al.). In the present study, we estimated and evaluated the interobserver variability of nuclear grading in primary pulmonary adenocarcinomas. Methods: We selected 122 primary pulmonary adenocarcinomas measuring 2 cm or less in diameter. Eight pathologists independently evaluated the nuclear factors, using the nuclear grading system reported previously by Nakazato et al. The same pathologists also used both the international multidisciplinary classification of pulmonary adenocarcinoma (2011 International Association for the Study of Lung Cancer classification) and Noguchi's classification, and assessed the extent of the lepidic pattern in the largest cut surface of the tumor. Interobserver agreement was evaluated using the κ statistic. The disease-free survival curves of the patients were obtained using the Kaplan-Meier method and analyzed with the log-rank test. Results: The mean (±SD) κ values for the two histological classifications, the extent of the lepidic pattern, and nuclear grading were 0.46 ± 0.09, 0.48 ± 0.09, 0.45 ± 0.16, and 0.58 ± 0.09, respectively. The cases judged as negative on the basis of nuclear grading showed a significantly better prognosis (5-year disease-free survival rate; 91.8% ± 2.7) than the positive cases did (68.6% ± 3.1). Conclusion: Nuclear grading is practical for prognostic evaluation of pulmonary adenocarcinoma. The interobserver agreement for nuclear grading is significantly higher than for histological classifications and the extent of the lepidic pattern. Nuclear grading is a reliable prognostic indicator for small adenocarcinomas.

Original languageEnglish
Pages (from-to)736-743
Number of pages8
JournalJournal of Thoracic Oncology
Issue number6
Publication statusPublished - 2013 Jun
Externally publishedYes


  • Extent of lepidic area
  • Histological classification
  • Interobserver agreement
  • Nuclear grading
  • Pulmonary adenocarcinoma

ASJC Scopus subject areas

  • Oncology
  • Pulmonary and Respiratory Medicine


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