In:
Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 38, No. 15_suppl ( 2020-05-20), p. e21074-e21074
Abstract:
e21074 Background: Patients with small tumor size but lymph node metastases (T1N1-N3, T1N1+) and patients with large tumor size but without lymph node metastases (T3-4N0, T3+N0) mainly belong to stage IIB to IIIA according to the 8 th version TNM staging. However, whether the contradictory between tumor size and lymph node may influence the survival and the underlying genomic differences have not been fully studied. Methods: Whole-exome sequencing and RNA sequencing data for 1001 patients with NSCLC including 514 lung adenocarcinoma (LUAD) and 487 lung squamous cell carcinoma (LUSC) were downloaded from TCGA. The prognosis between patients with T1N1+ and T3+N0 has been investigated. The DNA sequencing data and RNA sequencing data from TCGA were used to study the underlying mechanism. Results: Patients with T3N0+ consisted of 80.2% Stage IIB and 17.4% Stage IIIA and patients with T1N1+ consist of 66.7% Stage IIB and 25.9% Stage IIIA. There were no differences in race, age, staging or neoadjuvant history between T1N1+ and T3+N0 cases. T1N1+ patients were more frequent among females (P = 0.02) and were more likely to be adenocarcinomas (P = 0.01) compared to T3+N0. Patients with T1N1+ was associated with a prolonged disease-free survival (DFS) (HR, 0.47; 95% CI, 0.28-0.79; P 〈 0.05) and progression-free survival (PFS) (HR, 0.31; 95% CI, 0.17-0.56; P 〈 0.001) than patients with T3+N0. In the multivariable cox proportional hazards regression model including stage, patients with T1N1+ still had increased PFS (HR, 0.45; 95% CI, 0.26-0.82; P = 0.009) and DFS (HR, 0.38; 95% CI, 0.16-0.95; P = 0.04) compared to T3+N0 cases. Moreover, patients with T1N2, belong to Stage IIIA according to AJCC 8 th edition TNM staging, had a superior DFS (P = 0.01) and PFS (P = 0.04) compared with the patients with T3N0, who are in Stage IIB. Further investigation revealed that the tumor mutation burden was no significant difference between two groups (P 〉 0.05). There was no difference in genomic alterations between groups in LUSC and LUAD. GSEA analysis revealed that gene expression involved in DNA repair signaling was enriched in T1N1+ patients in LUSC and LUAD. Conclusions: Patients with T1N1+ shows a longer DFS and PFS compared with patients with T3+N0, especially T1N2 cases who belong to Stage IIIA show a better prognosis compared with T3N0 patients who are in Stage IIB, indicating the AJCC 8 th edition TNM staging need to be refined. Moreover, the better prognosis in T1N1+ patients may be related with DNA repair signaling genes enrichment.
Type of Medium:
Online Resource
ISSN:
0732-183X
,
1527-7755
DOI:
10.1200/JCO.2020.38.15_suppl.e21074
Language:
English
Publisher:
American Society of Clinical Oncology (ASCO)
Publication Date:
2020
detail.hit.zdb_id:
2005181-5
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