Open AccessAbdominal lymph node metastasis by lymphatic spread through the thoracic duct in patients with non‐small‐cell lung cancer
Author(s) -
Ryu Wookyung,
Lee Myoung Kyu,
Park Mi Hwa,
Hyun In Young,
Lee Minkyung,
No EunJi,
Yong Seok Joong,
Kim Jung Soo,
Lim Jun Hyeok,
Ryu JeongSeon
Publication year - 2021
Publication title -
thoracic cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.823
H-Index - 28
eISSN - 1759-7714
pISSN - 1759-7706
DOI - 10.1111/1759-7714.14014
Subject(s) - medicine , thoracic duct , radiology , lymph , thorax (insect anatomy) , metastasis , lymph node , surgery , cancer , pathology , anatomy
Abstract Background Abdominal lymph node metastasis (ALNM) is common in patients with metastatic non‐small‐cell lung cancer (NSCLC). However, its mechanism of spread remains to be elucidated. We investigated whether thoracic duct has the role as a pathway for ALNM in NSCLC using clinical data. Methods We classified ALNM into subgroups by their location and evaluated its prevalence and association with clinical characteristics in 892 patients with metastatic NSCLC. The abdominal lymph nodes were classified into direct or indirect groups depending on whether they drain directly into the trunk (intestinal trunk or lumbar trunks) connected to the cisterna chyli. Results One hundred‐five patients (11.8%) had ALNM. The paraaortic lymph node was most commonly involved, followed by the aortocaval, left gastric, paracaval, and celiac lymph nodes. After grouping the patients by location of ALNM, 56 patients (53.3%) with ALNM were in the “direct only” group, only seven patients (6.7%) were in the “indirect only” group, and 42 patients (40.0%) were in “both” groups. In patients whose intrathoracic lesions were limited to the right thorax, there was a significantly lower prevalence of ALNM (3.4% vs. 14.3%, p < 0.001). On multivariate logistic regression analysis of clinical variables, higher N category was associated with increased risk of ALNM. Conclusions This study suggests that the thoracic duct is one of the potential routes of lymphatic spread to the abdominal lymph nodes. Clinicians should assess for the presence of ALNM during staging work‐up and follow‐up for NSCLC patients with intrathoracic lesion in left thorax and with high N category.