100PD - Lymph node involvement influenced by lung adenocarcinoma subtypes in tumor size ≤3 cm disease: A study of 2268 cases

Date 14 April 2016
Event European Lung Cancer Conference 2016 (ELCC) 2016
Session Predictive models for chemo- and radiotherapy
Topics Non-small-cell lung cancer
Presenter Yongfeng Yu
Citation Journal of Thoracic Oncology (2016) 11 (supplement 4): S57-S166. S1556-0864(16)X0004-4
Authors Y. Yu, S. Lu
  • Shanghai Lung Cancer Center, Shanghai Chest Hospital, 200030 - Shanghai/CN

Abstract

Background

Whether lung adenocarcinoma subtype has influence on lymph node involvement in small-sized lung cancer is still unclear. If it has, we want to clarify the extent of the impact.

Methods

We identified 2268 operable lung adenocarcinoma patients with tumor size≤3 cm who had undergone a lobectomy and systematic lymph node dissection at Shanghai Chest Hospital between July 2012 and December 2014. The histologic subtypes of all patients were classified according to the IALSC/ATS/ERS classification. The relationship between lymph node involvement and clinicopathologic characteristics was evaluated.

Results

Lymph node involvement (pN1+ pN2) was found in 7 of 220 (3.2%) patients with tumor size ≤1.0 cm, 173 of 1196 (14.5%) patients with tumor size >1.0, ≤2.0 cm, and 265 of 852 (31.1%) patients with tumor size >2.0, ≤3.0 cm. Among all 2268 patients, the percentages of lymph node involvement(pN1+ pN2) were: 47.6%, 47.2%, 24.0%, 18.9%, 18.1%, 0%, 0%, and 0% for solid predominant (Sol), micropapillary predominant (MIP), variants of invasive adenocarcinoma (VIA), papillary predominant (Pap), acinar predominant (Aci), lepidic predominant (Lep), minimally invasive adenocarcinoma (MIA), adenocarcinoma in situ (AIS), respectively. For Sol and MIP, the percentages of lymph node involvement were significantly higher than other subtypes, 50.0% and 66.7% in tumor size ≤1.0 cm, 42.0% and 38.6% in tumor size >1.0, ≤2.0 cm, 52.2% and 55.7% in tumor size >2.0, ≤3.0 cm.

Conclusions

Our study revealed that lung adenocarcinoma subtypes had important role in lymph node involvement for the patients with small-sized lung cancer.

Clinical trial identification

Legal entity responsible for the study

Shanghai Chest Hospital, Shanghai Jiao Tong University

Funding

Shanghai Chest Hospital, Shanghai Jiao Tong University

Disclosure

All authors have declared no conflicts of interest.