Risk Factors and Patterns of Abdominal Lymph Node Recurrence After Radical Surgery for Locally Advanced Thoracic Esophageal Squamous Cell Cancer
Received 14 February 2020
Accepted for publication 10 May 2020
Published 27 May 2020 Volume 2020:12 Pages 3959—3969
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 2
Editor who approved publication: Professor Harikrishna Nakshatri
Yichun Wang,1,* Dongmei Ye,2,* Mei Kang,1 Liyang Zhu,1 Shuhao Pan,1 Fan Wang1
1Department of Radiation Oncology, The First Affiliated Hospital of Anhui Medical University, Hefei 230022, Anhui, People’s Republic of China; 2Department of Thoracic Surgery, The First Affiliated Hospital of Anhui Medical University, Hefei 230022, Anhui, People’s Republic of China
*These authors contributed equally to this work
Correspondence: Fan Wang Tel +86-055162923541
Background: We aimed to identify the suitable indication and delineate the target volume based on the pattern of abdominal lymph node recurrence (ALNR) after radical surgery for guiding postoperative radiotherapy in thoracic esophageal squamous cell cancer (TESCC).
Methods: Clinical data of patients with locally advanced TESCC after radical surgery without perioperative anti-tumor therapies from June 2011 to June 2016 were reviewed. Logistic regression analysis was used to find out the high-risk factors of ALNR. The pattern of ALNR was analysed and a template CT in the Pinnacle treatment plan system was used to reconstruct the distribution of the sites of ALNR.
Results: A total of 63 (19.57%) patients with 276 lymph nodes of ALNR were identified in 322 patients. Univariate logistic regression indicated that pathological tumor location, width of tumor, T stage, N stage, TNM stage, ratio of lymph node metastasis (LNM), vessel carcinoma embolus, cancerous node, LNM in the middle and lower mediastinum, LNM in the abdominal region, ratio of LNM in the abdominal region were risk factors of ALNR. Multivariate logistic regression analysis showed that only LNM in the abdominal region was an independent risk factor. The odds ratio was 7.449 (95% CI=2.552– 22.297, P< 0.001). Station 16a2, station 9, station 16b1, and station 8 were the major regions of ALNR. The recurrence rates were 10.56%, 9.63%, 7.14% and 5.28% in these stations, respectively.
Conclusion: Positive pathological abdominal lymph nodes should be the major indication for abdominal irradiation in postoperative radiotherapy for locally advanced TESCC. We recommended that the target volume includes station 8, station 9, station 16a2 and station 16b1 and proposed a specific delineation of the clinical target volume based on the distribution of ALNR on template CT images.
Keywords: esophageal carcinoma, clinical target volume, recurrence, postoperative radiotherapy, abdominal lymph nodes
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