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01.12.2014 | Ausgabe 12/2014

Surgical Endoscopy 12/2014

A multi-center study of using carbon nanoparticles to track lymph node metastasis in T1–2 colorectal cancer

Zeitschrift:
Surgical Endoscopy > Ausgabe 12/2014
Autoren:
Jun Yan, Fangqin Xue, Hongyuan Chen, Xiufeng Wu, Hui Zhang, Gang Chen, Jianping Lu, Lisheng Cai, Gao Xiang, Zhenwei Deng, Yu Zheng, Xiaoling Zheng, Guoxin Li
Wichtige Hinweise
Jun Yan and Fangqin Xue have contributed equally to this study.
Presented at the SAGES 2014 Annual Meeting, April 2–5, 2014, Salt Lake City, Utah.

Abstract

Background

How to identify whether T1–2 colorectal cancers have lymph nodes metastases pre-op or intra-op is a crucial problem in clinic. The purpose of this study was to evaluate the feasibility of using carbon nanoparticles to track lymph nodes metastases in T1–2 colorectal cancers.

Methods

A multi-center study was performed between July 2012 and January 2014. Seventy-three patients with T1–2 colorectal cancer identified by pre-op endoscopic ultrasonography (EUS) were recruited. 1 ml carbon nanoparticles suspension was endoscopically injected into the submucosal layer at four points around the site of the primary tumor 1 day before surgery. Laparoscopic radical resection with lymphadenectomy was performed. Sentinel lymph nodes (SLNs) were defined as nodes that were black-dyed by carbon nanoparticles. Pathology confirmed whether lymph nodes have cancer metastases and the SLNs accuracy.

Results

SLNs were easily found under laparoscopy. The mean number of SLNs was 3 (range 1–5). All patients had SLNs lying alongside the mesenteric vessel or main arterial vessel. After pathological analysis, 2 patients (9.52 %) had lymph node metastasis in 21 patients with EUS T1 cancers, and 10 patients (19.23 %) had lymph node metastasis in 52 patients with EUS T2 cancers. In two T1 cases with lymph node metastasis, SLNs were positive with 100 % accuracy. In ten T2 cases with lymph node metastasis, SLNs were positive in nine cases. In pathology, carbon nanoparticles were seen in lymphatic vessels, and lymphoid sinus and macrophages in negative SLNs. When SLNs were positive, carbon nanoparticles were seen around cancer cells in lymph nodes. The overall sensitivity, specificity, accuracy of SLNs in T1–2 colorectal cancers were 91.67, 100, 98.63 %, respectively.

Conclusions

We demonstrated the feasibility of using carbon nanoparticles to track lymph nodes metastases in T1–2 colorectal cancers. Carbon nanoparticles black-dyed lymph nodes play a role as SLNs in T1–2 colorectal cancers.

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