Analysis of NSCLC tumour heterogeneity, proliferative and 18F-FDG PET indices reveals Ki67 prognostic role in adenocarcinomas

Alessandro Del Gobbo, Alessio Pellegrinelli, Gabriella Gaudioso, Massimo Castellani, Federica Zito Marino, Renato Franco, Alessandro Palleschi, Mario Nosotti, Silvano Bosari, Valentina Vaira, Stefano Ferrero

Research output: Contribution to journalArticle

Abstract

Aims: The role of tumour metabolic and proliferative indices in predicting non-small-cell lung cancer (NSCLC) patients' prognosis is unclear. We correlated fluorine 18 (18F)-fluorodeoxyglucose (FDG)-positron emission tomography (PET) value and Ki67 index to patients' survival, taking into account tumour heterogeneity, disease characteristics and genetic aberrations. Methods and results: A series of 383 NSCLCs was arranged into tissue microarrays and Ki67 staining was analysed by immunohistochemistry. The maximum standardized uptake (SUVMAX) value detected by 18F-FDG-PET analysis was calculated over a region of interest. Large-cell and squamous cell carcinomas had higher proliferative and metabolic activities than adenocarcinomas, and the two measures were correlated significantly. The hot-spot Ki67 value was correlated with patients' survival and the cut-off to discriminate patients in the survival risk groups was 20%. Ki67 hot-spot values were greater in anaplastic lymphoma kinase (ALK) rearranged tumours. Adenocarcinomas showed the highest intratumour heterogeneity in proliferative activity and the hot-spot Ki67 value predicted only the prognosis of patients in this group. Although tumour metabolic activity was not associated with patients' prognosis, a SUVMAX > 2 was related to nodal metastases, tumour size and grade. Conclusions: Our results highlight how tumour heterogeneity influences evaluation of prognostic biomarkers. Our data support Ki67 evaluation to estimate NSCLC patients' prognosis, particularly for adenocarcinoma.

Original languageEnglish
Pages (from-to)746-751
Number of pages6
JournalHistopathology
Volume68
Issue number5
DOIs
Publication statusPublished - 2016

Keywords

  • PET
  • Adenocarcinoma
  • Ki67
  • Lung cancer

ASJC Scopus subject areas

  • Histology
  • Pathology and Forensic Medicine

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